Article
Chemistry, Physical
Hafiz Muhammad Asif Javed, Wenxiu Que, Muhammad Shahid, Akbar Ali Qureshi, M. Afzaal, M. Salman Mustafa, Shahid Hussain, Abdullah Saad Alsubaie, Khaled H. Mahmoud, Zeinhom M. El-Bahy, Ling Bing Kong
Summary: The research investigated the effects of anodization parameters on the growth behavior and top morphology of TiO2 nanotubes. Different TiO2 nanostructures were obtained through electrochemical anodization of Ti foil by varying parameters, and dye sensitized solar cells based on TiO2 nanohexagons showed the highest power conversion efficiency. The efficiency of DSSC was further enhanced through modifications of TiO2 nanohexagons with TiO2 nanoparticles derived from TiCl4.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Gihoon Cha, Selda Ozkan, Imgon Hwang, Anca Mazare, Patrik Schmuki
Summary: This study reports the use of Li+-inserted TiO2 nanotubes as a photoanode scaffold in dye-sensitized solar cells, and demonstrates an improved solar cell efficiency compared to non Li-intercalated electrodes.
Article
Electrochemistry
Juliana Rios, Victor N. Santini, Karina D. Pereira, Augusto D. Luchessi, Eder S. N. Lopes, Rubens Caram, Alessandra Cremasco
Summary: Titanium-based biomaterials with a nanostructured surface have enhanced cellular response and bactericidal behavior. This study found that the addition of Fe affects the formation and crystallization of TiO2 nanotubes on titanium substrates. Crystalline nanotubes improved in vitro cellular response.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Brishty Deb Choudhury, Chen Lin, Sk Md Ali Zaker Shawon, Javier Soliz-Martinez, Hasina Huq, Mohammed Jasim Uddin
Summary: The study presents an improved photoanode with hierarchical microstructure of photoactive TiO2, along with the deposition of plasmonic nanoparticle Ag using photoreduction method. The branched structure of the photoanode increases dye loading, while Ag nanoparticles play multiple roles in enhancing light-to-current conversion efficiency. This novel design shows remarkably higher photon conversion efficiency compared to traditional structures.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Nurulhuda Bashirom, Wai Kian Tan, Go Kawamura, Atsunori Matsuda, Zainovia Lockman
Summary: In this work, anodic self-aligned oxide nanotube arrays were produced by anodic oxidation of Ti-40 wt.% Zr alloy in EG/NH4F/H2O electrolyte. The ZrTiO4-TiO2 nanotubes exhibited higher photocatalytic activity for reducing Cr(VI) ions compared to ZrO2-TiO2 nanotubes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Electrical & Electronic
Varishetty Madhu Mohan, Kenji Murakam, Madhavi Jonnalagadda, V. R. Machavaram
Summary: Pure TiO2 and surface-modified TiO2 films were developed using spray pyrolysis technique, with similar crystal structure and optical absorption properties. However, the addition of ZnO layer in SMT films increased impedance and hindered reverse electron transmission. Thus, the efficiency of DSSCs improved from 8.25% to 9.3%.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Fengjuan Miao, Fuchen Chu, Bingcheng Sun, Bairui Tao, Peng Zhang, Yu Zang, Paul K. Chu
Summary: This study presents the design and fabrication of a photoanode composed of Au/SnS/TiO2 sensitized with natural dye for dye-sensitized solar cells (DSSCs). By calcination, a layer of spherical nano-TiO2 is prepared, and a layer of nano-SnS is deposited on the TiO2 photoanode using the continuous ion layer adsorption reaction (SILAR). The sensitized Au nanoparticles exhibit enhanced localized surface plasmon resonance (LSPR) effects and electron trapping ability, resulting in improved electron mobility and reduced electron recombination in the DSSC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Divya Chopra, Tianqi Guo, Saso Ivanovski, Karan Gulati
Summary: This study aims to standardize and simplify anodization of ten metals by synthesizing a standard electrolyte to fabricate controlled nanostructures. The influence of substrate topography, electrolyte composition, and electrolyte aging on the nano-engineering strategy is investigated. Anodization of curved substrates with micro-roughness facilitates industrial translation across various applications.
Review
Energy & Fuels
Xuelan Hou, Kerttu Aitola, Peter D. Lund
Summary: This review focuses on the fabrication methods of TiO2 nanotube (TNT) photoelectrodes for dye-sensitized solar cells (DSSCs), as well as modifications to improve efficiency and stability. The active area of the DSSC is strongly linked to power conversion efficiency (PCE), making it crucial to evaluate and compare cell efficiencies with the same active area. Future goals include reducing material and manufacturing costs of TNT-based DSSCs.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
S. C. Poh, H. Ahmad, C. H. Ting, H. T. Tung, H. K. Jun
Summary: A flexible DSSC was fabricated in this study, where the impact of different ratios of TiO2 powder to ethanol on performance was investigated, along with the addition of hydrochloric acid to enhance particle connectivity. The optimum conversion efficiency of the prepared film was 2.12%, with a ratio of TiO2 powder to ethanol of 25 wt%.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Tse-Wen Huang, Lu-Yin Lin, Siao-Ting Hong
Summary: This study presents a novel approach to fabricate TiO2 nanoparticle-decorated TiO2 microcone array (TMC) with holes as the semiconductor on the photoanode of FDSC using a simple two-step process. By optimizing with 30 mM H2SO4, the FDSC achieved an efficiency of 2.52% and a collection efficiency of 92.21%, outperforming the FDSC with a pure TMC photoanode.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Ceramics
M. L. Puga, J. Venturini, W. C. Guaglianoni, T. L. Ruwer, T. B. Wermuth, C. P. Bergmann
Summary: This study successfully synthesized aluminum-doped TiO2 nanotubes via a single-step anodization method, achieving microstructural control by changing the anodization potential and effectively inserting aluminum into the anatase lattice to enhance optical absorption and photoelectrochemical performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Bandana Ranamagar, Isaac Abiye, Fasil Abebe
Summary: The Rhodamine-6G derivative Rhd and its metal complexes with aluminum and chromium ions were synthesized and characterized using UV-vis and fluorescence spectroscopy. Dye-sensitized solar cells (DSSCs) were fabricated with Rhd and the metal complexes, and their solar-to-electric power efficiencies were determined through current-density measurements and Electrochemical Impedance Spectroscopy (EIS). The Rhd and Cr3+-sensitized solar cell showed the highest solar to electric power efficiency at 0.16%.
Article
Chemistry, Physical
Yanqing Li, Yu Tan, Kexin Liang, Leilei Zhang, Shenghan Zhang
Summary: TiO2 nanotube arrays were produced using the DTEO method, and the effects of anodizing factors on the dimensions of the NTs were studied through CCD experiments. The study found that the NT length is strongly influenced by the interaction of anodizing voltage and time, while the tube pitch only depends on the anodizing voltage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Melik Ziya Yakut, Meryem Serfiraz Bilici
Summary: This study examines the effect of different methods and chemicals on the working electrode in dye-sensitized solar cells (DSSC). The results show that the efficiency of the Nb-doped cell is significantly higher than the undoped cell, and it can be produced more economically.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Nirjhar Bhattacharyya, Uttpal Anand, Ravi Kumar, Mimosa Ghorai, Tariq Aftab, Niraj Kumar Jha, Anushka Upamali Rajapaksha, Jochen Bundschuh, Elza Bontempi, Abhijit Dey
Summary: The use of CRISPR technology allows for the modification of plants to better remediate soil contaminated with toxic metals. This technique has been successfully applied to various crops and has identified genes related to metal absorption and tolerance. However, the efficacy of CRISPR technology is influenced by multiple factors.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Environmental Sciences
Tamal Chowdhury, Hemal Chowdhury, Elza Bontempi, Mario Coccia, Hasan Masrur, Sadiq M. Sait, Tomonobu Senjyu
Summary: This study finds that hosting the Tokyo Summer Olympics did not lead to an increase in COVID-19 cases in Japan. The transmission dynamics were mainly driven by population density, similar to other large cities in Japan. The study provides evidence that hosting mega sporting events is safe during the pandemic if strict non-pharmaceutical and pharmaceutical infection control measures are maintained. The successful implementation of preventive measures during the Tokyo Summer Olympics will serve as an example for future international events.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Haibin Wang, Hao Zhang, Yan Huang, Haiyu Wang, Adnan Ozden, Kaili Yao, Huamin Li, Qianying Guo, Yongchang Liu, Alberto Vomiero, Yuhang Wang, Zhao Qian, Jun Li, Ziyun Wang, Xuhui Sun, Hongyan Liang
Summary: Elastic strains in metallic catalysts can enhance the selectivity for valuable multicarbon (C2+) products in carbon dioxide reduction (CO2R). However, the structure of catalysts often undergoes reconstruction under harsh conditions, leading to the loss of initial strain. In this study, a metal/metal oxide synthetic strategy is developed to introduce and maintain tensile strain in a copper/ceria heterostructure, resulting in improved C2+ selectivity and efficiency in CO2R.
Article
Chemistry, Multidisciplinary
Kassa Belay Ibrahim, Tofik Ahmed Shifa, Paolo Moras, Elisa Moretti, Alberto Vomiero
Summary: A heterointerface catalyst with strong metal support interaction (SMSI) between WMn2O4 and TiO2 is designed for efficient and stable oxygen evolution reaction (OER). The engineered heterointerface exhibits a low onset overpotential and long-term durability.
Editorial Material
Chemistry, Physical
Avelino Nunez-Delgado, Zhien Zhang, Elza Bontempi, Mario Coccia, Marco Race, Yaoyu Zhou
Article
Green & Sustainable Science & Technology
Elsayed Mousa, Xianfeng Hu, Ludvig Annhagen, Guozhu Ye, Antonella Cornelio, Ario Fahimi, Elza Bontempi, Patrizia Frontera, Charlotte Badenhorst, Ana Claudia Santos, Karen Moreira, Alexandra Guedes, Bruno Valentim
Summary: This paper reports on the characterization of two grades of black mass from spent lithium-ion batteries and their behavior during heating trials. The study provides important insights for optimizing lithium-ion battery recycling processes by fully characterizing black mass samples before and after heating.
Article
Green & Sustainable Science & Technology
Getachew Solomon, Mojtaba Gilzad Kohan, Raffaello Mazzaro, Matteo Jugovac, Paolo Moras, Vittorio Morandi, Isabella Concina, Alberto Vomiero
Summary: Hierarchical nanostructures composed of NiMoO4 nanorods surrounded by active MoS2 nanosheets on a nickel foam substrate were designed and showed excellent oxygen evolution reaction performance and charge storage capacity, suggesting promising applications in the catalysis field.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Letizia Liccardo, Matteo Bordin, Polina M. Sheverdyaeva, Matteo Belli, Paolo Moras, Alberto Vomiero, Elisa Moretti
Summary: Defect-engineered nanostructured TiO2 photocatalysts were obtained by hydrogenation strategy to extend its light absorption into the near-infrared region. The hydrogenation process enhanced the photocatalytic activity and resulted in significant degradation of organic pollutants.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Giada Biava, Annalisa Zacco, Alessandra Zanoletti, Giampiero Pasquale Sorrentino, Claudia Capone, Antonio Princigallo, Laura Eleonora Depero, Elza Bontempi
Summary: The direct aqueous carbonation of steel slag and cement kiln dust was explored in a new pressurized reactor, aiming to identify optimal reaction conditions and promising by-products for reuse in the construction industry. A synergistic strategy for managing industrial waste and reducing the use of virgin raw materials in Lombardy, Italy, particularly Bergamo-Brescia, was proposed. Initial findings showed promising results, with argon oxygen decarburization (AOD) slag and black slag producing the best results in terms of CO2 capture efficiency.
Article
Chemistry, Multidisciplinary
Daria Pankratova, Silvia Maria Giacomelli, Khabib Yusupov, Farid Akhtar, Alberto Vomiero
Summary: This study aims to produce high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing their thermoelectric (TE) properties. The researchers successfully obtained the material using a faster and scalable process compared to the previous technique.
Article
Chemistry, Applied
Nicolo Spigariol, Letizia Liccardo, Edlind Lushaj, Enrique Rodriguez-Castellon, Isabel Barroso Martin, Federico Polo, Alberto Vomiero, Elti Cattaruzza, Elisa Moretti
Summary: TiO2 thin films have photocatalytic properties and can degrade dyes and pollutants in water solutions. The use of nanostructures, such as TiO2 nanorod arrays, can enhance the photocatalytic activity by improving molecular adsorption and electronic transfer properties. By depositing a thin layer of sub-stoichiometric TiO2_x on top of the nanorod arrays, a vacancy doped homojunction is formed, leading to a lower band gap and enhanced photochemical activity. The photocatalytic activity was tested using methylene blue as the target molecule, and significant degradation was achieved under both UV and simulated solar light irradiation.
Review
Chemistry, Physical
Pankaj Kumar, Shujie You, Alberto Vomiero
Summary: Semitransparent photovoltaic (STPV) solar cells have great potential for special applications such as windows, facades, and skylights. Researchers have developed STPVs using traditional thin-film solar cell technologies (amorphous-Si, CdTe, and CIGS) or emerging solar cells (organic, perovskites, and dye-sensitized). This review analyzes the device structure of state-of-the-art STPV devices and discusses approaches to maximize power conversion efficiency and average visible transmittance. Practical aspects such as electrode compatibility, buffer layer optimization, light management engineering, scale-up, and stability are also discussed.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Jiurong Li, Jiancang Chen, Xiujian Zhao, Alberto Vomiero, Xiao Gong
Summary: Organosilane-grafted carbon dots (Si-CDs) were synthesized by hydrothermal method and can be uniformly dispersed in polyvinyl alcohol (PVA) matrix. Si-CDs/PVA thin-film LSCs exhibit excellent absorption in the UV spectral region and about 90% transmission in the visible range, with high stability and power conversion efficiency (PCE).
Article
Geochemistry & Geophysics
Giampiero Pasquale Sorrentino, Renato Guimaraes, Bruno Valentim, Elza Bontempi
Summary: The purpose of this research is to evaluate the feasibility of carbon dioxide sequestration through mineralisation using waste materials. Four different types of ashes and combustion by-products were used, and their impact on the carbonation process was analyzed. The results show that water content and pressure play a significant role in CO2 sequestration during accelerated carbonation.
Article
Green & Sustainable Science & Technology
Gayan W. C. Kumarage, Dario Zappa, Catalina G. G. Mihalcea, Valentin-Adrian Maraloiu, Mariana Stefan, Elisabetta Comini
Summary: This study presents conductometric sensors based on Co3O4 nanowires for hydrogen detection at ppb levels. The nanowires exhibit diameters between 6-50 nm and lengths of 1-5 & mu;m, primarily growing along the (311) direction of spinal Co3O4. Raman investigation reveals characteristic peaks corresponding to symmetric phonon modes of crystalline Co3O4. The sensors show abnormal n-type semiconducting behavior above 300 & DEG;C due to lattice oxygen's involvement in the hydrogen sensing mechanism. Operating at 450 & DEG;C in dry air, the sensor shows a higher response to 100 ppm H-2 compared to other gases and maintains a consistent conductance baseline even under high humidity for 25 days.
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
(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)
