Article
Materials Science, Multidisciplinary
Bing Xiong, Liangbing Ge, Xueyan Lei, Yangkai Wang, Jiwen Yang, Weiwei Li, Xiaoning Li, Zhenxiang Cheng, Zhengping Fu, Yalin Lu
Summary: Electron configurations and conductivity are important characteristics for the oxygen evolution reaction (OER), and can be modulated by heteroatom doping. In this study, the effect of anion doping on the electronic structure of ZnCo2O4 (ZCO) was investigated. It was found that substituting oxygen with sulfur increased the proportion of Co2+ in the low-spin states, making it more OER-active than Co3+. The Co-S interaction in sulfur-doped ZCO (ZCO-S) resulted in the redistribution of electron density and fast charge transfer. ZCO-S showed 11 times higher specific OER activity compared to pristine ZCO. Conversely, doping with fluorine deteriorated OER activity. This study establishes the correlation between anion electronegativity and OER intrinsic activity in spinel oxides, providing a new avenue for the design of high-performance spinel electrocatalysts.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Qi Feng, Yanbing Sun, Huimin He, Jing Zhao, Fanyuan Meng, FuXing Wang, Dezhou Zheng, Guangxia Wang, Fuqin Deng, Ningbo Yi, Bingjun Jin
Summary: Exploring cost-effective and high-performance electrocatalysts for the oxygen evolution reaction (OER) is important for utilizing renewable energies. The quenching method introduced in this work successfully enhances the OER activity of ZnCo2O4 catalyst by generating Fe doped and oxygen vacancy. The quenched ZnCo2O4 catalyst exhibits vastly improved OER activity compared to the un-quenched counterpart.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Bahaa M. Abu-Zied, Lucie Obalova, Katerina Pacultova, Anna Klegova, Abdullah M. Asiri
Summary: This study aimed to develop new spinel-oxide catalysts using a microwave-assisted co-precipitation method, with Mn0.75Co0.25Co2O4 catalyst showing the best performance. Doping with K ions at optimal concentration further enhanced the activity of the catalyst. The presence of contaminants in the reactor feed had different inhibitory effects on the performance of the K0.025Mn0.75Co0.25Co2O4 catalyst, with the inhibitory order being O-2 < H2O < NO < O-2 + H2O < O-2 + H2O + NO.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Chengliang Lin, Jiaxuan Yin, Shengrui Cui, Xiang Huang, Wei Liu, Yongcheng Jin
Summary: This study proposes a simplified method to build a well-tuned dual structure of LiF coating and F- doping LNMO cathode material via simple calcination, which effectively improves the electrochemical performance of LNMO. The optimized LNMO-1.3LiF cathode material exhibits a high discharge capacity of 140.3 mA h g-1 at 1 C and 118.7 mA h g-1 at 10 C, with a capacity retention rate of 75.4% after 1000 cycles at 1 C. This research provides concrete guidance on how to effectively boost the electrochemical performance of LNMO cathode materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Chengliang Lin, Jiaxuan Yin, Shengrui Cui, Xiang Huang, Wei Liu, Yongcheng Jin
Summary: This study proposes a method to construct a dual structure of LiF coating and F- doped LNMO cathode material by simple calcination of LNMO with LiF at low temperatures. The experimental results demonstrate that the electrochemical performance of LNMO is effectively improved by the LiF coating and the F- doping.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Min Chen, Wenqing Hou, Chen Chen, Yechen Wang, Yiming Xu
Summary: This work investigates the photocatalytic activity of zinc cadmium sulfide under different light wavelengths and finds that the optimal x value for the maximum hydrogen evolution rate varies. Furthermore, it is observed that the activity and stability of zinc cadmium sulfide are improved after loading ZnCo2O4.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Hala M. Abo-Dief, Salah M. El-Bahy, Omima K. Hussein, Zeinhom M. El-Bahy, Muhammad Shahid, Imran Shakir
Summary: In this study, Silver doped Zinc Cobaltite (AgZnCo2O4, AgZCO) nanoparticles were synthesized using a solvent-free strategy and integrated with reduced graphene oxide (rGO) sheets to form the AgZCO@rGO composite. The structural and morphological properties of the prepared samples were analyzed using various physio-chemical techniques. The photocatalytic experiments showed that AgZCO@rGO had a higher degradation efficiency than ZCO and AgZCO catalysts.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
M. Dhanasekar, Satyajit Ratha, Chandra Sekhar Rout, S. Venkataprasad Bhat
Summary: In this study, hydrothermally synthesized self-assembled ZnCo2O4 (ZCO) nanosheets were used for the high adsorption and sonophotocatalytic degradation of methylene blue in the presence of sunlight with ultrasound. The sonophotocatalytic functionality of the ZCO nanosheets was examined in detail and compared with recent relevant reports.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Kang Xiao, Yifan Wang, Peiyuan Wu, Liping Hou, Zhao-Qing Liu
Summary: By incorporating F anions into the oxygen vacancies of spinel ZnCo2O4, the lattice oxidation mechanism (LOM) of oxygen evolution reaction (OER) has been triggered and the residual protonation has been balanced, leading to the stabilization of the catalyst structure.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Xiaobo Hu, Yongzhao Wang, Ruifang Wu, Yongxiang Zhao
Summary: The study prepared a series of defective N-doped Co3O4 catalysts using a facile method and confirmed the successful doping of N atoms into Co3O4. Among them, N-Co3O4-0.05 exhibited the best performance in N2O decomposition reaction, attributed to the promotion of defective structures and oxygen vacancies, as well as the enhanced redox properties of Co2+ and Co3O4 by N doping.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Ming Ya, Yaowen Wang, Jianghao Wang, Guichen Gao, Xu Zhao, Yanhua Wei, Zhibin Geng, Guangshe Li, Liping Li
Summary: In this study, a temperature-induced lattice distortion strategy was employed to manipulate the electronic structure of spinel ZnCo2O4, resulting in excellent performance for the oxygen evolution reaction (OER). The study revealed the correlation between the distortion of CoO6 octahedra, spin state of Co3+ ions, and OER activity.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Xin Ma, Zhihua Ying, Fei Wen, Lili Li, Xiaolong Zheng, Peng Zheng, Gaofeng Wang
Summary: This study successfully prepared ZnCo2O4 material for formaldehyde gas sensors by varying the addition of sodium citrate, and found that ZnO-ZnCo2O4 showed better gas sensitivity and selectivity. These results provide important foundational knowledge for the application of spinel oxide materials in the field of gas sensors.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Kao-Pin Hwang, Hung-Chih Lin, Ming-Han Zham, Ruei-Sung Yu
Summary: ZnCo2O4 film prepared by heat treatment exhibits excellent optical and electrical properties, high antibacterial performance, and shows characteristics of a p-type semiconductor.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Polymer Science
M. Silambarasan, P. S. Ramesh, D. Geetha, K. Ravikumar, H. Elhosiny Ali, H. Algarni, P. Soundhirarajan, Kamlesh V. Chandekar, Mohd. Shkir
Summary: Hybrid nanocomposites, particularly zinc cobaltite (ZnCo2O4) nanostructures, have been shown to have dual electrochemical properties, making them advantageous for supercapacitor device fabrication. Through various analytical techniques, the structural, optical and electrochemical properties of ZnCo2O4 nanostructures were confirmed, demonstrating their potential for electrochemical energy storage devices. The highest capacitance of 159 F g(-1) at 2 mA cm(-2) in 2 M KOH electrolyte and 92% initial capacitance retention over 2500 cycles further highlight the promising usage of ZnCo2O4 nanostructures in energy storage devices.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Engineering, Environmental
Jiabing Luo, Xingzhao Wang, Yufeng Gu, Shutao Wang, Yanpeng Li, Tingyong Wang, Yang Liu, Yan Zhou, Jun Zhang
Summary: In this study, a hierarchical sheet-like W-NiCo2O4-2 spinel OER electrocatalyst was prepared through a high-valence oxyanion exchange strategy, exhibiting favorable activity and durability. The hierarchical structure increased specific surface area and edge active sites amount, accelerating mass transport and charge transfer. W6+ doping optimized electron filling and active species generation, improving reaction kinetics and enhancing conductivity. This work provides a universal pathway for modulating spinel-based OER electrocatalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Inorganic & Nuclear
Aashi Kasera, Jyoti Prasad Biswas, Abdulmohsen Ali Alshehri, Shaeel Ahmed Al-Thabaiti, Mohamed Mokhtar, Debabrata Maiti
Summary: Pincer-ligated metal complexes, as catalysts, have distinctive benefits due to the rigid coordination sphere created by the pincer ligand. The versatile design of the pincer backbone and the harmonious relation between the metal center and the non-innocent ligand make these complexes competitive against conventional catalysts. This review highlights the remarkable features of pincer-ligated metal complexes and their growing capacity in C-H activation chemistry.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Engineering, Environmental
Katabathini Narasimharao, Ganesh Kumar Reddy Angaru, Zahid Hussain Momin, Shaeel Al-Thabaiti, Mohamed Mokhtar, Abdulmohsen Alsheshri, Sulaiman Yahya Alfaifi, Janardhan Reddy Koduru, Yoon-Young Chang
Summary: In this study, a composite material consisting of orange waste biochar-magnesium silicate (OBMS) was prepared and utilized for the adsorption removal of hexavalent uranium (U(VI)) ions from water. The OBMS composite exhibited high adsorption capacity and stability due to the interaction between U(VI) ions and functional groups presented on the OBMS surface. This low-cost and easily synthesized adsorbent has great potential for the remediation of radioactive U(VI) ions in aquatic environments.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Mokhtar, Subir Panja, Abdulmohsen Alshehri, Wael Halawani, Debabrata Maiti
Summary: A nanocomposite catalyst based on CuO/ZnO/ZrO2 materials was developed using the coprecipitation method and subsequent calcination. The catalysts were characterized using TGA, XRD, SEM, and N-2-physisorption analysis. The nanocomposite catalyst with a Cu/Zn ratio of 1:1 exhibited the smallest particle size and largest surface area. It demonstrated excellent efficacy for the oxidation of benzylic alcohol under optimal conditions and could be used for up to three catalytic cycles with minimal loss of activity.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Mohamed Mokhtar M. Mostafa, Ahmed Shawky, Sharif Fakhruz Zaman, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen A. Alshehri, Nezar H. Khdary, Sulaiman Al-Faifi, Abhishek Dutta Chowdhury
Summary: Photocatalytic conversion of carbon dioxide (CO2) into methanol (CH3OH) using PdO/GdFeO3 nanocomposites as photocatalysts was investigated. The inclusion of PdO into GdFeO3 enhanced the visible-light absorption and reduced the overall bandgap. The optimized PdO dosage of 1.5% resulted in significantly improved CH3OH production and sustainable recyclability.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Multidisciplinary Sciences
Dmitry Galyamin, Jorge Torrero, Isabel Rodriguez, Manuel J. Kolb, Pilar Ferrer, Laura Pascual, Mohamed Abdel Salam, Diego Gianolio, Veronica Celorrio, Mohamed Mokhtar, Daniel Garcia Sanchez, Aldo Saul Gago, Kaspar Andreas Friedrich, Miguel A. Pena, Jose Antonio Alonso, Federico Calle-Vallejo, Maria Retuerto, Sergio Rojas
Summary: The study finds that low-ruthenium-content pyrochlores (R2MnRuO7, R = Y, Tb, and Dy) exhibit high activity and durability for the oxygen evolution reaction (OER) in acidic media. Among them, Y2MnRuO7 is the most stable catalyst, showing a voltage of 1.5 V at 10 mA cm(-2) for 40 h, or 5000 cycles up to 1.7 V. Experimental and computational results indicate that the excellent performance is attributed to the Ru sites embedded in RuMnOx surface layers. A water electrolyzer with Y2MnRuO7 and only 0.2 mgRu cm(-2) achieves a current density of 1 A cm(-2) at 1.75 V, remaining stable at 200 mA cm(-2) for over 24 h. These findings suggest further investigation on Ru catalysts with the goal of enhancing OER performance through a partial replacement of Ru with inexpensive cations. Ru-pyrochlores can serve as alternative anodes of PEM water electrolyzers, and their high performance is attributed to the Ru sites embedded in RuMnOx surface layers. The durability of a water electrolyzer with Y2MnRuO7 and only 0.2 mgRu cm(-2) has been successfully demonstrated.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Tamer S. Saleh, Ahmad K. Badawi, Reda S. Salama, Mohamed Mokhtar M. Mostafa
Summary: In response to the global deficiency in water sources, efficient decontamination of water and wastewater has become a significant topic worldwide. This study successfully synthesized activated carbon derived from willow catkins and loaded it with nickel ferrite nanocomposites using a one-step hydrothermal method. The prepared nanocomposites showed excellent degradation efficiency, particularly 45NFAC, which achieved a 99.7% degradation of rhodamine B dye in just 90 minutes under simulated sunlight. Overall, NFAC nanocomposites are considered promising photocatalysts for water environmental remediation due to their effectiveness, reliability, and reusability.
Article
Chemistry, Physical
Katabathini Narasimharao, Mohamed Mokhtar M. Mostafa, Zahra M. M. Al-Amshany, Wejdan Bajafar
Summary: In this study, CaO/ZnCo2O4 nanocomposites were synthesized and found to exhibit superior catalytic activity in ester exchange reactions. The nanocomposite with 20% CaO and 80% ZnCo2O4 showed the highest catalytic performance, which can be attributed to its high number of basic sites and high porosity.
Article
Biochemistry & Molecular Biology
Abeer Nasser Al-Romaizan, Manoj Kumar Gangwar, Ankit Verma, Salem M. Bawaked, Tamer S. Saleh, Rahmah H. Al-Ammari, Ray J. Butcher, Ibadur Rahman Siddiqui, Mohamed Mokhtar M. Mostafa
Summary: Using air-stable palladium catalysts, we demonstrate an effective method for catalytic acceptorless dehydrogenation (CAD) to convert secondary benzylic alcohols into ketones and produce molecular hydrogen.
Article
Chemistry, Physical
Doaa F. Baamer, Islam Hamdy Abd El Maksod
Summary: The surface modification of zinc ferrite due to Ti doping was confirmed by deep analysis of the electronic spectra. In addition, a comparison study of photo degradation using ordinary UV irradiation and commercial LED light irradiation showed promising results. The correlation between the structure and the photo catalytic behavior of the materials was investigated.
Article
Chemistry, Multidisciplinary
Shaeel Ahmed Althabaiti, Zaheer Khan, Katabathini Narasimharao, Salem Mohamed Bawaked, Soad Zahir Al-Sheheri, Mohamed Mokhtar, Maqsood Ahmad Malik
Summary: An Ag-modified TiO2 nanomaterial was synthesized using a one-pot method. The structure and morphology of the synthesized material were determined using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that the addition of metallic Ag nanoparticles decreased the optical band gap and photoluminescence intensity of TiO2, while increasing the Raman peak intensity and absorbance. The Ag-modified TiO2 nanomaterial exhibited higher photocatalytic efficiency than bare TiO2 and Ag metal NPs, attributed to the synergistic effect between Ag metal and TiO2 structures.
Article
Chemistry, Multidisciplinary
Abeer Nasser Al-Romaizan, Salem M. Bawaked, Tamer S. Saleh, Mohamed Mokhtar M. Moustafa
Summary: An efficient, economical, and green synthesis method for fused azines has been developed using Mg-Al hydrotalcite under a high-pressure Q-Tube reactor. This method offers short reaction time, excellent yields, and the ability to reuse the catalyst without losing its catalytic activity for multiple cycles.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Shaeel Ahmed Althabaiti, Zaheer Khan, Salem Mohamed Bawaked, Soad Zahir Al-Sheheri, Mohamed Mokhtar, Maqsood Ahmad Malik, Katabathini Narasimharao
Summary: TiO2 nanotubes, Fe3O4-ZnO, and nanocomposites of Fe3O4-ZnO and TiO2 were synthesized by varying the amount of Fe3O4-ZnO. PtOx nanoparticles were then decorated onto the surface of the nanocomposites using a green synthesis method. The synthesized samples were characterized through various spectroscopy and microscopy techniques, revealing strong interaction between Fe3O4-ZnO and TiO2 nanotubes. Deposition of PtOx resulted in a decrease in the bandgap, and Fe3O4-ZnO/TiO2 nanocomposites exhibited higher surface area and pore volume compared to Fe3O4-ZnO sample. The presence of PtOx species inhibited the recombination of e-/h+ pairs, leading to improved photocatalytic H2 production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Ahmad K. K. Badawi, Reda S. S. Salama, Mohamed Mokhtar M. Mostafa
Summary: Industrial wastewater is a major consumer of fresh water and a strong source of pollution. Coagulation-flocculation is an effective technique for removing contaminants from industrial effluents, but the potential of natural coagulants/flocculants (NC/Fs) remains underappreciated. This review explores the feasibility of using natural materials from various sources for industrial effluent treatment and highlights the successful use of magnetic-natural coagulants/flocculants (M-NC/Fs) in diverse industrial effluents. The review also discusses the potential for reprocessing spent materials as a renewable resource and suggests large-scale treatment systems.
Article
Chemistry, Inorganic & Nuclear
Mohamed Mokhtar M. Mostafa, Yining Li, Wael Halawani, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen A. A. Alshehri, Nezar H. H. Khdary, Sulaiman Al-Faifi, Lin Gu, Abhishek Dutta Chowdhury
Summary: The increased awareness of carbon management has driven the scientific community to develop sustainable catalytic technologies for CO2 conversion. Copper-based multifunctional catalysts are commonly used for thermal hydrogenation and electrocatalytic reduction of CO2. This study synthesized Cu-Zn oxides combined with Al2O3 and ZrO2 through coprecipitation and annealing at different temperatures, revealing that the composition and pretreatment temperature of Cu-Zn oxides significantly affect electrocatalytic CO2 reduction performance. The findings provide insights for designing an efficient catalytic system for CO2 conversion.
DALTON TRANSACTIONS
(2023)
Review
Chemistry, Multidisciplinary
Soumya Kumar Sinha, Pintu Ghosh, Shubhanshu Jain, Siddhartha Maiti, Shaeel A. Al-Thabati, Abdulmohsen Ali Alshehri, Mohamed Mokhtar, Debabrata Maiti
Summary: C-H activation plays a crucial role in the synthetic strategies for multi-step transformations, but its importance lies in its application in large-scale industrial processes and the synthesis of complex natural products. Recent advancements in C-H activation methodologies have led to the discovery of more efficient synthesis methods and accelerated the synthesis of complex organic compounds.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
