Article
Green & Sustainable Science & Technology
Sayed Y. Attia, Ahmed G. Bedir, Yosry F. Barakat, Saad G. Mohamed
Summary: This study reports a hydrothermal approach to synthesize nickel-doped bismuth-layered double hydroxide as a 2D heterostructure bifunctional electrode material for symmetric supercapacitors. The designed electrode exhibits a wide and efficient operating potential window, high specific capacity, outstanding cycling performance, and significant specific energy. These results suggest a potential strategy for designing efficient symmetric supercapacitors.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Zhiqiang Liu, Aihua Li, Yanling Qiu, Qingyu Zhao, Yuxue Zhong, Liang Cui, Wenrong Yang, Joselito M. Razal, Colin J. Barrow, Jingquan Liu
Summary: In this work, MgCo2O4@NiMn layered double hydroxide core-shell structured nanocomposites on Ni foam are synthesized and exhibit excellent electrochemical performance and potential applications in energy storage devices.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Chunyan Li, Xin Li, Huiqin Wang, Pengwei Huo, Yan Yan, Xinkun Wang
Summary: By inducing partial phosphating on NiGa-LDH, the derived Ni2P/NiGa2O4/NiGa-LDH structure effectively improves the capacitance and charge/discharge speed of supercapacitors, while preserving the layered structure of LDHs and reducing the charge transfer impedance. Additionally, the hybrid supercapacitor (HSCs) composed of Co3O4-C negative electrode and Ni2P/NiGa2O4/NiGa-LDH positive electrode demonstrates excellent energy density and long-term stability under high power density.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Meiying Cui, Li Wei, Soo-Jin Park, Seok Kim
Summary: To increase the capacitance of an inorganic electrode material, CoFe-layered double hydroxide (LDH) was grafted onto the surface of hexagonal-flower-like NiCo2O4. Various composites with different Co/Fe ratios were grown directly on Ni foam using the hydrothermal method. The composite with a Co/Fe molar ratio of 1:2 (NiCo2O4 @Co1Fe2-LDH) exhibited the best electrochemical performance, with a specific capacitance of 2595 F g-1 at a current density of 1 A g-1. The composite prevented aggregation of CoFe-LDH, leading to high specific capacitance and good stability. The electrode was used in a packaging asymmetric capacitor, resulting in a maximum energy density of 27.33 Wh kg-1 at a power density of 800 W kg-1 and an excellent capacitive retention of 96% even after 5000 charge-discharge cycles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Zhiqiang Liu, Ying Liu, Yuxue Zhong, Liang Cui, Wenrong Yang, Joselito M. Razal, Colin J. Barrow, Jingquan Liu
Summary: Hierarchical MgCo2O4@CoFe-LDH core-shell nanowire arrays on Ni foam were synthesized via hydrothermal and calcination methods, showing excellent specific capacitance and cycling stability. These materials have great potential for application in energy storage devices.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Chemical
Yixing Wang, Fang Xu, Fu Zhou, Liheng Dai, Kai Qu, Yulin Wu, Shuyun Gu, Zhi Xu
Summary: This study presents a facile synthesis method for preparing LDHs/MXene composites at room temperature, which exhibit exceptional electrochemical performance including high specific capacitance, outstanding rate capacity, and excellent stability. The findings provide a facile way to construct layered LDHs for various applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Xiaobo Chen, Jiangyue Zhu, Jianghao Cai, Yang Zhang, Xiaohua Wang
Summary: The MXene/MoSe2 composite shows excellent performance as an anode material for high-performance asymmetric supercapacitors, with high specific capacitance and capacitance retention even after 10,000 cycles.
JOURNAL OF ENERGY STORAGE
(2021)
Review
Chemistry, Multidisciplinary
Xue Li, Jianning Ren, Deepak Sridhar, Ben Bin Xu, Hassan Algadi, Zeinhom M. El-Bahy, Yong Ma, Tingxi Li, Zhanhu Guo
Summary: Nowadays, supercapacitors are gaining widespread attention due to their excellent performance in specific capacitance, cycle life, power density, energy density, and operating temperature range. Layered double hydroxides (LDHs) have emerged as promising electrode materials for supercapacitors because of their unique morphology, simple preparation method, large surface area, and high theoretical specific capacitance. This review provides an overview of recent methods for LDHs preparation and presents the different properties obtained from different methods. The article also highlights recent approaches for modifying LDHs and presents various types of LDHs used in supercapacitors, along with their electrochemical performance and energy storage mechanisms.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Qianlan Ke, Yuhui Zhang, Yuanheng Fu, Chenxi Yang, Fan Wu, Zhongxiu Li, Yi Wei, Kun Zhang
Summary: In this study, we investigated the electrochemical performance of a carbon fabric-based supercapacitor coated with MnOx@rGO nanohybrids using a simple one-step hydrothermal method. The effect of the mass ratio of MnOx to rGO on the electrochemical properties was studied. It was found that the supercapacitor with a mass ratio of 0.8:1 for MnO@rGO exhibited a specific capacitance of 831.25 mF cm(-2) at a current density of 0.1 mA cm(-2) when loaded with 5.40 mg cm(-2) of MnO@rGO nanohybrids on carbon fabric. Furthermore, it showed a long-term cycling capacitance retention of 97.2% after 10,000 charge-discharge cycles at a current density of 0.4 mA cm(-2). The high electrochemical performance is speculated to be attributed to the strong interfacial bonding between the hierarchical architecture of MnO@rGO nanohybrids and carbon fabric.
Article
Chemistry, Inorganic & Nuclear
Bhimaraya R. Biradar, Sukanya Maity, Pranay R. Chandewar, Debaprasad Shee, Partha Pratim Das, Sib Sankar Mal
Summary: The use of reduced graphene oxide (rGO) mediated polyoxometalates (POMs) based electrode materials in energy storage devices has shown promising performance due to their redox properties. In this study, rGO nanocomposites embedded with silicotungstate [K5[SiVW11O40]. nH2O (SiVW11) were synthesized for supercapacitor applications. The nanocomposites exhibited improved capacitance and stability and were successfully used to power a DC motor.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xuezhen Zhu, Xueyan Li, Haisheng Tao, Maoguo Li
Summary: In this study, Co2Al/Co2Mn nanocomposites with excellent electrochemical performance were successfully prepared on nickel foam, reducing internal resistance and enhancing charge transport capabilities. The nanocomposites showed significantly improved performance in hybrid supercapacitors, with excellent cycle stability and potential for practical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
S. Dhanalakshmi, I. Manohara Babu, S. Karuthapandian, N. Prithivikumaran
Summary: Nanoarchitectured electrodes with unique morphology and excellent electrochemical performance have always been the focus of research in the supercapacitor field. An effective and innovative electrode, formed by combining gadolinium oxide nanorods (as an energy source) and copper sulfide nanoflakes (as a power source with excellent conductivity), was synthesized using a simple chemistry approach. The synthesized electrode exhibited admirable rate performance (367 F g-1) and excellent cycle life (85.7% retention over 7500 charge/discharge cycles), attributed to its distinctive morphology.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Electrochemistry
Baolei Shen, Xilin Liao, Xuefei Zhang, Hai-Tao Ren, Jia-Horng Lin, Ching-Wen Lou, Ting-Ting Li
Summary: In this study, a robust 2D cross-linked structure was constructed by coating Nb(2)CTx MXene with Co3O4, addressing the issue of limited ideal electrode materials for supercapacitors. The Co-MXene electrode showed a higher specific capacitance compared to pure Co3O4 and Nb2C MXene electrodes. The asymmetric supercapacitors also exhibited high specific energy densities and power densities. This research provides valuable guidance for the fabrication of satisfactory electrochemical energy storage devices.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Ang Li, Miaomiao Zhai, Mingxing Luan, Jingbo Hu
Summary: Rational designing and constructing multiphase hybrid electrode materials effectively compensates for the performance defects of single component materials, with Cu2Se@Co3Se4 electrode demonstrating outstanding electrochemical performance and long lifespan.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Yuqi Wang, Dianyu Jiang, Yan Zhang, Jian Chen, Mingjiang Xie, Cheng Du, Liu Wan
Summary: In this study, we successfully synthesized unique core-shell nanoclusters composed of Co-CH@NiAl-LDH on a carbon cloth substrate using a two-step hydrothermal strategy. The presence of abundant heterointerfaces in the hierarchical porous core-shell structure enhances conductivity and facilitates ion/electron transfer. The as-prepared Co-CH@NiAl-LDH hybrid material exhibits high specific capacity and excellent rate capability, and the assembled hybrid supercapacitor demonstrates impressive energy and power densities, as well as superior capacity retention.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Nanoscience & Nanotechnology
Sung Jae Kim, Vikas Sharma, Tolendra Kshetri, Nam Hoon Kim, Joong Hee Lee
Summary: This study presents a facile strategy for stabilizing layered triple hydroxides (LTHs) based positrode and optimizing Mn1Fe2S2 based negatrodes for high-performance supercapacitors. The fabricated quasi-solid-state supercapacitor exhibits high specific capacity, specific capacitance, energy, and power performance, along with excellent cycling life. This approach provides a neoteric foresight for developing high-performance advanced energy storage devices equipped with cheaper and eco-friendly components.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Sakshi Kansal, Paulomi Singh, Sudipta Biswas, Ananya Chowdhury, Debabrata Mandal, Surbhi Priya, Trilok Singh, Amreesh Chandra
Summary: Ni-Co layered double-hydroxides (LDHs) with their lamellar morphology and higher number of active sites show efficient charge transfer, making them highly useful for catalytic applications. A bimetallic LDH catalyst is reported for efficient hydrogenation of p-nitrophenol, a common toxic and carcinogenic pollutant in industrial wastewater. The catalyst demonstrates high performance and a facile synthesis protocol. The catalytic performance at higher temperatures is discussed, and the advantage of Ni-Co LDH as an electrocatalyst for the hydrogen evolution reaction (HER) is explored, indicating potential large-scale industrial use.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Rishabh Jaiswal, Garima Chaturvedi, Vikas Sharma, S. A. Ilangovan, Sujatha SarojiniAmma, K. S. Ajeesh, Sankara Sarma V. Tatiparti
Summary: This study investigates whether fractal-like structures are beneficial for supercapacitor applications by hydrothermally synthesizing Fe2O3 in fern, flake, and microsphere morphologies with similar specific surface areas. The Fern@NF electrode exhibits the highest specific capacitance and capacitance retention after 2000 cycles. The capacitive surface charge storage increases with fractal dimensions, promoting the performance of ferns. Fractal-like structures are beneficial for supercapacitor applications through promoting capacitive surface charge storage.
Article
Chemistry, Physical
Puja De, Joyanti Halder, Surbhi Priya, Alok Kumar Srivastava, Amreesh Chandra
Summary: An interconnected sheet-like morphology of low-cost V2O5 is used as a cathode material for aluminum-ion batteries to improve their capacity, rate capability, and cycling stability. The V2O5-based cathode shows excellent performance, with an initial discharge capacity of around 140 mA h g-1 and a capacity retention of 96% after 1000 cycles. The fast intercalation and deintercalation of Al3+ within the stacked layers of V2O5 contribute to these high-performance characteristics, which have been previously ignored in aluminum-ion batteries.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Puja De, Debabrata Mandal, Sudipta Biswas, Abhishek Kumar, Surbhi Priya, Brajesh Kumar Dubey, Alok Kumar Srivastava, Amreesh Chandra
Summary: The slow kinetic nature and poor cycling performance of bulk Na2Ti3O7 (NTO) can be improved by fabricating hierarchical nanostructures. The interconnected 1D nanotubular particles show a much higher electrochemical performance compared to 2D flakes or 3D pillar-like morphologies. High-performance Na-ion supercapacitors can be fabricated using these materials.
Article
Environmental Sciences
D. Mandal, P. De, S. Khatun, A. N. Gupta, A. Chandra
Summary: A high photoluminescence nanosensor based on graphene quantum dots was developed for the detection of toxic ions and compounds in water. The GQDs/Fe(III) complexes showed a high fluorescent quenching efficiency for the hydrophobic surface of the GQDs, enabling the detection of Fe(III) with a concentration of 40 +/- 2 nM. This method is facile, sensitive, and fast, making it ideal for water quality detection in rivers, ponds, or industrial wastes.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Electrochemistry
Puja De, Lalit Bharti, Joyanti Halder, Surbhi Priya, Amreesh Chandra
Summary: This study reports the use of Mn3O4 nanostructures as cathode materials for aqueous AIBs to enhance specific capacity, rate capability, and cycling stability. Mn3O4 cathode in AlCl3 aqueous electrolyte exhibits the highest initial discharge capacity and excellent capacity retention and cycling stability.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Electrical & Electronic
Sourav Das, Sourabh Pal, Debabrata Mandal, Pallab Banerji, Amreesh Chandra, Rabaya Basori
Summary: Recently, metal-dichalcogenides (MDs) have attracted much attention for future optoelectronic devices due to their unique electronic and optical properties. However, the presence of structural defects hinders the application of MDs in device integration by trapping free charge carriers. In this study, ultraviolet (UV) treatment was used to successfully passivate defects in SnS2, resulting in significant improvement in the performance of the photodetector. The UV-treated SnS2 exhibited higher responsivity, external quantum efficiency, and faster response speed compared to the untreated SnS2.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
Joyanti Halder, Sudipta Biswas, Ananya Chowdhury, Debabrata Mandal, Sakshi Kansal, Surbhi Priya, Puja De, Alok Kumar Srivastava, Amreesh Chandra
Summary: The morphology of the electrode material plays a crucial role in improving the performance of supercapacitors. This study demonstrates the influence of morphology on magnetic supercapacitors by using different morphologies (rod, porous rods, solid spheres, and hollow spheres) of α-Fe2O3 as the negative electrode material. Additionally, a theoretical model is proposed to explain the correlation between the electrochemical response and the diffusion behavior of electrolyte ions. Under a 200 Gauss magnetic field, a 55% increase in specific capacitance is achieved, which is attributed to the change in surface states, as evidenced by the corresponding electrocatalysis performance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Sakshi Kansal, Joyanti Halder, Debabrata Mandal, R. Rahul, Surbhi Priya, Puja De, Vikas Sharma, Alok Kumar Srivastava, Trilok Singh, Amreesh Chandra
Summary: Cr2O3 is a promising cathodic material for supercapacitor applications due to its fast redox kinetics, mesoporous structure, and high electrochemical stability. The unique cactus-like morphology of Cr2O3 particles obtained through a one-step synthesis improves the specific surface area and electrolyte ion diffusion, leading to enhanced capacitance values.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Energy & Fuels
Debabrata Mandal, Lalit Bharti, Sudipta Biswas, Amreesh Chandra
Summary: Lithium-ion capacitors (LICs) are becoming useful due to their high energy and power densities. Researchers propose a novel strategy of decorating LiMn2O4 with graphene to improve the electrical conductivity and electrochemical performance of LICs.
Article
Energy & Fuels
Rishabh Jaiswal, Garima Chaturvedi, Vikas Sharma, S. A. Ilangovan, Sujatha SarojiniAmma, K. S. Ajeesh, Sankara Sarma V. Tatiparti
Summary: This study investigates the benefits of fractal-like structures for supercapacitor applications by synthesizing Fe2O3 in different morphologies. The results show that the Fern@NF electrode with fractal-like structures has higher specific capacitance and better cycling stability. Increasing the fractal dimension enhances capacitive surface charge storage and reduces impedance. These findings provide guidance for designing and synthesizing supercapacitor materials with fractal-like structures.
Article
Materials Science, Multidisciplinary
Debabrata Mandal, Sudipta Biswas, Ananya Chowdhury, Amreesh Chandra
Summary: Recently, high performance supercapacitors based on hollow nanostructures have been reported. However, the explanation that the enhancement is solely due to the higher specific surface area is oversimplified. Careful modeling and simulation studies reveal that hollow structures can be viewed as pseudo 2-dimensional materials, leading to performance similar to 2-dimensional materials like metal oxides and MXenes. This study explains the underlying reasons for the performance enhancement for the first time and experimentally validates the theoretically predicted behavior. The importance of using hollow structures of rare-earth oxides in supercapacitors is established, and the future direction is suggested to involve combining a pseudo 2-D structure with a real 2-D-carbon based electrode.
MATERIALS ADVANCES
(2022)
Article
Nanoscience & Nanotechnology
Hema Bora, Debabrata Mandal, Amreesh Chandra
Summary: In this study, a highly sensitive vitamin D3 sensor based on carbon nanotubes was developed. The sensor showed high performance in the concentration range of 0-10 nM, with a detection limit of 16 pM. It also demonstrated high selectivity and long-term stability.
ACS APPLIED BIO MATERIALS
(2022)
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)