Article
Chemistry, Physical
Shubhangi B. Bandgar, Madagonda M. Vadiyar, Chitra L. Jambhale, Jin-Hyeok Kim, Sanjay S. Kolekar
Summary: A rapid and low-cost ice crystal-assisted precipitation method was used to synthesize self-assembled structures of nickel ferrite nanoparticles and zinc ferrite nanorods, enhancing the overall performance of supercapacitors. The porous void-rich structures of the nanoparticles and nanorods provided excellent charge storage properties, with high specific capacities and durability demonstrated in the electrodes. Additionally, a flexible asymmetric supercapacitor device fabricated from these materials showed superhigh energy density and excellent long-term stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Min Fu, Zhihao Zhang, Zitong Zhu, Qingru Zhuang, Wei Chen, Hao Yu, Qingyun Liu
Summary: This study synthesized uniform strontium ferrite nanorods on graphene to create SrFe12O19 NR/G composites, which exhibited excellent capacitance performance and energy density power density characteristics. The influence of component ratio on the electrochemical performances of the composites was thoroughly studied.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Review
Electrochemistry
Jieqiong Qin, Zhi Yang, Feifei Xing, Liangzhu Zhang, Hongtao Zhang, Zhong-Shuai Wu
Summary: Two-dimensional mesoporous materials (2DMMs) combine the merits of 2D materials and mesoporous materials, offering a promising solution for high-performance electrode/catalyst materials in energy storage and conversion devices. This review summarizes the recent advances in 2DMMs for ESCDs, including their structural advantages, chemical synthesis strategies, and applications in supercapacitors, rechargeable batteries, and electrocatalysis.
ELECTROCHEMICAL ENERGY REVIEWS
(2023)
Article
Energy & Fuels
S. Ezhil Arasi, R. Ranjithkumar, P. Devendran, M. Krishnakumar, A. Arivarasan
Summary: The study reported the supercapacitive behavior of chemically synthesized cobalt vanadate nanostructures. Crystallographic information and optical response were investigated through various analytical techniques. The prepared Co3V2O8 showed specific capacitance value of about 790 F/g at 1 A/g current density and 90.1% capacitive retention after 10000 cycles, indicating its potential as an electrode material for future energy storage devices.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
Muhammad Sajjad, Azhar Iqbal, Muhammad Zia Ullah Shah, A. Shah, Sumreen Asim, Shaukat Khan, Mohammed A. Assiri, Muhammad Sufyan Javed, Wen Lu
Summary: An interesting strategy for synthesizing three-dimensional copper selenides micro-flowers for supercapacitor's electrode by a simple wet-chemical process is reported. The sample was characterized by XRD, SEM, and XPS. The CuSe-MFs electrode exhibits high capacitance, excellent rate performance, and superb stability, contributing substantially to the research of complex copper selenides architecture and the future application in high-performance supercapacitors.
Article
Biochemistry & Molecular Biology
Muhammad Saleem, Munirah D. Albaqami, Aboud Ahmed Awadh Bahajjaj, Fahim Ahmed, ElSayed Din, Waqas Ul Arifeen, Shafaqat Ali
Summary: In order to meet the increasing energy demands, it is crucial to develop electrochemical materials that can efficiently produce and store energy. Titanium dioxide (TiO2) has emerged as a promising choice due to its non-toxicity, low cost, and eco-friendliness, as well as its porosity, large surface area, good mechanical strength, and remarkable transport properties.
Article
Chemistry, Physical
Zhenyu Fu, Yanjing Wang, Yanbin Xu, Haifeng Li, Qingan Qiao, Ping Yin, Feng Wang, Xiaoling Guo, Zhenglong Yang
Summary: In this study, Ni3S2 materials were in-situ grown on nickel foam using the one-step reflux method, and a PPy conductive film was coated on the surface of Ni3S2 materials by electrodeposition to prepare self-supporting Ni3S2@PPy composites on nickel foam. The content of PPy on the surface of the Ni3S2 materials was controlled by adjusting the number of cyclic voltammetry cycles during the electro-deposition process. The Ni3S2@PPy composites exhibited excellent lithium storage performance when one cycle of cyclic voltammetry was applied. Coating with PPy significantly improved the decline of Ni3S2 electrode capacity after 50 cycles and enhanced the stability during later cycles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Agnieszka Gabryelczyk, Sudesh Yadav, Agnieszka Swiderska-Mocek, Ali Altaee, Grzegorz Lota
Summary: The study explores the use of common bio-wastes as materials for energy conversion and storage devices. Chicken eggshells were used as a precursor for electrode fillers in electrochemical capacitors and anode materials in Li-ion batteries. Different temperatures were used to obtain two groups of materials and their composition and properties were found to influence electrochemical performance. The results showed that the materials were suitable for both devices, with good capacitance and capacity retention.
Review
Energy & Fuels
Nur Dina Zaulkiflee, Abdul Latif Ahmad, Siew Chun Low, Nishiyama Norikazu
Summary: This work reviews the use of 2D nanosheets in supercapacitor applications, focusing on different energy storage mechanisms and electrode materials. It discusses the challenges and future potential of using nanosheets to develop high-performance supercapacitors, providing a reference for future research in energy conversion, storage, and environmental protection.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Chemistry, Physical
Wenbin Li, Qianqian Song, Matthew Li, Yifei Yuan, Jianhua Zhang, Ni Wang, Zihao Yang, Jianfeng Huang, Jun Lu, Xifei Li
Summary: Chemical heterointerfaces in hybrid electrode materials play a crucial role in optimizing electrochemical performances by accelerating charge transport, increasing storage sites, and enhancing structural stability. Recent research has focused on introducing chemical heterointerfaces in metal-ion batteries, supercapacitors, and Li-S batteries for improved energy storage applications.
Article
Materials Science, Ceramics
Ganesh Koyyada, Burragoni Sravanthi Goud, Mohamed Ouladsmane, Jae Hong Kim, Nam Hai Nguyen Thi, Nam Nguyen Dang
Summary: The demand for high-energy storage supercapacitors with appropriate designs has led to the development of g-C3N4/WO3(H2O)0.33 (GCN/WO) nanostructures, which have been prepared using a simple wet impregnation process. These nanostructures show improved electrochemical storage performance compared to their individual components, with increased specific capacitance and cyclic stability. The positive synergistic effect between GCN and WO in the nanostructures contributes to their enhanced electrochemical capacitor characteristics.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Chia-En Hsieh, Ching Chang, Shivam Gupta, Chung-Hsuan Hsiao, Chi-Young Lee, Nyan-Hwa Tai
Summary: This study demonstrates a novel fabrication method for supercapacitor electrodes composed of CoMn2O4 nanosheets coated onto carbon nanotubes grown on a stainless-steel mesh. By controlling the deposition time of the nanosheets, favorable morphology and excellent capacitance can be achieved. The material, which does not require binders or additives, exhibits high specific capacitance and is of significant importance for practical energy storage devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zheqin Chen, Yongmin Xie, Jiaming Liu, Xiaocong Zhong, Zhifeng Xu, Ruixiang Wang
Summary: Layered LaNi0.6Fe0.4O3-delta (LNFO) was prepared via a modified sol-gel method using a carbon nanotube dispersion for pore formation. The prepared LNFO had expanded specific surface area and uniform pores, exhibiting superior electrochemical performance compared to bulk-LNFO prepared by conventional synthesis method. The catalyst stability was demonstrated through chronoamperometric test for over 7200 s.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Parnia Forouzandeh, Priyanka Ganguly, Ravinder Dahiya, Suresh C. Pillai
Summary: This article reviews various techniques for electrode materials fabrication in supercapacitors, including solution-based chemical techniques, physical methods, and deposition techniques. Combination of multiple synthesis approaches can obtain electrode materials with excellent electrochemical properties.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Seokhun Kim, Vaiyapuri Soundharrajan, Sungjin Kim, Balaji Sambandam, Vinod Mathew, Jang-Yeon Hwang, Jaekook Kim
Summary: NHVO, a unique structured layered oxide electrode material synthesized by a microwave method, exhibits remarkable electrochemical reversibility and high specific capacity, making it suitable for high energy ARZIB cathodes and offering new opportunities for developing high energy ARZIB electrodes.
Article
Chemistry, Inorganic & Nuclear
C. Manjunatha, N. Srinivasa, S. Samriddhi, C. Vidya, S. Ashoka
SOLID STATE SCIENCES
(2020)
Article
Chemistry, Physical
C. Manjunatha, N. Srinivasa, S. K. Chaitra, M. Sudeep, R. Chandra Kumar, S. Ashoka
MATERIALS TODAY ENERGY
(2020)
Article
Chemistry, Physical
N. Srinivasa, L. Shreenivasa, Prashanth S. Adarakatti, Robert D. Crapnell, Samuel J. Rowley-Neale, Ashoka Siddaramanna, Craig E. Banks
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
L. Shreenivasa, R. T. Yogeeshwari, R. Viswanatha, K. Yogesh, S. Ashoka
Summary: This paper identifies and investigates the orthovanadate family CrVO(4) as a new cathode material for high-rate and high-capacity lithium ion batteries. A solution-based synthetic protocol is proposed to synthesize CrVO(4) nanoparticles, with physical characterizations showing enhanced conductivity and surface area. Experimental results demonstrate that the prepared CrVO(4) nanoparticles have enhanced lithium storage capabilities with high rate-capability and cyclability.
Article
Engineering, Electrical & Electronic
L. Shreenivasa, R. Viswanatha, Sriram Ganesan, Yogesh Kalegowda, Mahaveer D. Kurkuri, S. Ashoka
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Energy & Fuels
Anantha Mylarapattana Shankaranarayana, Anarghya Dinesh, Ashoka Siddaramanna, Shreenivasa Lakkepally, R. Viswanatha, Krishna Venkatesh, Yogesh K. Kumarswamy, Handanahally Basavarajaiah Muralidhara
Summary: The stable flower-like layered structure of MoS2-GO nanocomposites synthesized by a one-pot hydrothermal process acts as an electrocatalyst in multifunctional electrochemical performance. The distribution and morphological studies were analyzed via various techniques, and modified graphite felt electrodes showed the best electrochemical activity and reversibility. Iron redox flow battery performance with MoS2-GO nanocomposites exhibited high efficiency and peak power density, while also demonstrating effective electrocatalysis for the oxygen evolution reaction in 1.0 M KOH.
Article
Chemistry, Physical
N. Srinivasa, P. Rangaswamy, R. T. Yogeeshwari, C. Manjunatha, S. Ashoka
Summary: A new class of titanium compound, LiTiPO4F, has been identified as a water splitting electrocatalyst, exhibiting ultrahigh electrocatalytic activity and stability for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium. This mesoporous LiTiPO4F catalyst shows good OER/HER activity with low Tafel slopes, making it a promising bifunctional electro-catalyst.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
N. Srinivasa, L. Shreenivasa, S. Ashoka, K. Yogesh
Summary: This study identified Co3O4-NiO nanocomposite as an efficient electrocatalyst for oxygen evolution reaction (OER) and proposed a simple synthesis method for large-scale production. The 0.7Co(3)O(4)-0.3NiO modified electrode showed superior OER activity with lowest overpotentials, smallest Tafel slope, and long term stability compared to other compositions. This research demonstrates the superior performance of Co3O4-NiO nanocomposite over Ni-doped Co3O4 for OER catalysis.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
P. Sagar, L. Shreenivasa, Asad Syed, Najat Marraiki, S. Ashoka
Summary: This study validates the improved electro-catalytic performance of non-noble metal-based electro-catalysts by adding amorphous Al2O3, with the 20% amorphous Al2O3-added Co3O4/NiO nanocomposite showing the best OER performance.
Article
Chemistry, Physical
B. S. Nishchith, S. Ashoka, Mahesh P. Bhat, Mahaveer D. Kurkuri, Shashidhara Acharya, Rajendra Kumar, Yogesh Kalegowda
Summary: The study investigates the dynamic self-limiting surface restructuring of Na3NiCO3PO4 through multiple characterization techniques and computational methods, providing fundamental insights into the pseudocapacitance mechanism of mixed polyanionic compounds. The surface-reconstructed electrode exhibits high-performance pseudocapacitive behavior, with high specific capacitance, energy density, power density, and long cycle life, thanks to the dense Ni(OH)2 layers and NiOOH oxidation derived from the surface reconstruction.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Inorganic & Nuclear
L. Shreenivasa, S. Ashoka, K. Yogesh, Asad Syed, Najat Marraiki, Prashanth S. Adarakatti
Summary: In this study, undoped and cobalt-doped BiPO4 catalysts were successfully synthesized using a one-step glycinenitrate decomposition method. The results showed that BiPO4 undergoes surface reconstruction during the oxygen evolution reaction (OER) and is converted into Bi2O3, which acts as the active catalyst for OER. The 5% cobalt-doped BiPO4 exhibited excellent OER activity with low overpotentials of 328 mV and 394 mV for current densities of 10 and 50 mA cm(-2), respectively, which were much lower than that of undoped BiPO4 (480 mV). Furthermore, the polarization curves of the 5% cobalt-doped BiPO4 showed negligible changes in overpotential even after 20 hours of continuous electrolysis, demonstrating excellent stability in alkaline KOH. This work highlights the enhancement of the intrinsic electro-catalytic activity of phosphate-based catalysts by doping with suitable transition metals and through surface reconstruction.
SOLID STATE SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
P. Sagar, K. Yogesh, Asad Syed, Najat Marraiki, Abdallah M. Elgorban, Nouf S. S. Zaghloul, S. Ashoka
Summary: In this study, a composite material NiOOH/Fe2O3 was prepared using a simple method, showing excellent performance and long-term stability in the OER process.
Article
Chemistry, Multidisciplinary
B. S. Nishchith, Yogesh Kalegowda, S. Ashoka, Ganesan Sriram, Mahaveer D. Kurkuri, Manjunatha Channegowda
Summary: In this study, environmentally friendly and cost-effective synthesis of amorphous nickel-copper carbonate hydroxide was achieved by etching hydrothermally prepared Na3NiCuCO3PO4 using alkaline solution. The resulting mesoporous structure and high specific surface area enhanced electrolyte penetration and facilitated high faradaic reactions. The synthesized material showed excellent capacitance and cyclic stability, making it a promising electrode material for advanced electronic applications.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
N. Srinivasa, Jack P. Hughes, Prashanth S. Adarakatti, C. Manjunatha, Samuel J. Rowley-Neale, S. Ashoka, Craig E. Banks
Summary: The facile synthesis of Ni/NiO nanocomposites was achieved through solution combustion methodology with controlled composition of metallic Ni within NiO by varying annealing time. The optimal Ni/NiO nanocomposite exhibited significantly enhanced electrocatalytic activity for the oxygen evolution reaction, showing promising stability and potential for mass production of stable electrocatalysts for commercial applications.
Article
Chemistry, Multidisciplinary
P. Sagar, S. Ashoka, Asad Syed, Najat Marraiki
Summary: A potential electro-catalyst, amorphous nickel oxyhydroxide, was successfully prepared on a stainless steel substrate using a simple cathodic deposition followed by anodic activation method. The amorphous nickel oxyhydroxide@SS material exhibited good catalytic performance and stability, with the OER proceeding through the formation of NiO2 intermediate. The experimental results also highlighted the significant impact of cathodic deposition time on the interfacial charge transfer resistance and OER performance.
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)
