Article
Energy & Fuels
Khalil Ahmad, Ghazanfar Abbas, M. Ashfaq Ahmad
Summary: Solid oxide fuel cell (SOFC) is considered a promising alternative energy conversion technology due to its higher efficiency, flexibility of fuel uses, and environment friendly nature. However, the high operational temperature required by conventional SOFC increases cost and leads to degradation of cell components. This study demonstrates the synthesis of nanocomposite Fe(0.2)Ni0(0.3)Cu(0.5) using a solid state method as a low-temperature SOFC anode. Graphene oxide (GO) is incorporated to enhance the properties of the Fe(0.2)Ni0(0.3)Cu(0.5) anode, reducing the operating temperature and cost for wider market acceptance. The crystal structure, surface morphology, and conductivity of the prepared material are analyzed, showing promising results for its application in low-temperature SOFCs.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Ceramics
Tomoki Murata, Toru Asaka, Sakyo Hirose
Summary: Dielectric tunability has been extensively studied in ferroelectric materials, with negative tunability being common and positive tunability rare. However, titanite CaTiSiO5 demonstrates both positive and negative tunability, suggesting unique behavior in high electric fields compared to conventional antiferroelectrics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Review
Chemistry, Physical
Mandeep Singh, Dario Zappa, Elisabetta Comini
Summary: Fuel cells are becoming increasingly popular as a highly efficient, clean, and sustainable energy conversion source with different types having their own pros and cons. Solid oxide fuel cells (SOFC) are gaining attention for their high efficiency and versatility in utilizing various fuels apart from hydrogen. Recent advancements mainly focus on two types of SOFC stack designs and their implications for medium and large power requirements.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Xiangyi Long, Paul Boldrin, Yeshui Zhang, Nigel Brandon, Nigel Paterson, Marcos Millan
Summary: Integrated gasification fuel cell technology is a promising option for processing solid fuels, and this study evaluates the impact of gases produced from a gasifier on typical materials used in fuel cell anodes, aiming to make the system carbon-capture ready. The results show that fuel gas from CO2/H2O gasification tends to have less carbon and sulfur deposits on the anode materials.
Article
Chemistry, Analytical
Kapil Sood, Pankaj Tiwari, Shivani Dhall, Suddhasatwa Basu
Summary: This study evaluates titanium and samarium doped ceria as potential anode material for intermediate temperature solid oxide fuel cells. The synthesized materials are characterized in terms of phase, texture, chemical environment, and morphology. The results confirm the potential of the material as an anode material for IT-SOFCs.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Fangming Liu, Bin Bai, Liang Cheng, Chen Xu
Summary: In this study, spinel Li4Ti5O12 (LTO) was successfully synthesized using flash sintering technique, demonstrating better crystallinity, higher purity, and smaller particle size compared to conventionally synthesized LTO. The flash sintered LTO exhibits higher specific capacities, better cycling stabilities, and rate capabilities than the conventionally synthesized samples, showing potential for improving the electrochemical performance of anode materials for lithium-ion batteries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Rubayyat Mahbub, Tim Hsu, William K. Epting, Gillian Nolan, Yinkai Lei, Noel T. Nuhfer, Randell B. Doane, Harry W. Abernathy, Gregory A. Hackett, Shawn Litster, Anthony D. Rollett, Paul A. Salvador
Summary: The study explores the morphological differences in microstructures of commercial SOFC electrodes and quantifies relative microstructural changes in Ni and pore distributions, showing that scaled-adjusted electrodes have comparable ANOVA sub-volumes.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida
Summary: This study investigates the deformation behavior of the anode during reduction and the effect of reduction conditions using NiO-YSZ. It is found that the Ni volume fraction is a major factor, with low Ni volume fraction samples showing expansion and high Ni volume fraction samples showing shrinkage. The expansion behavior is due to the release of compressive residual stress on the YSZ side during reduction.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Ceramics
Or Rahumi, Alexander Sobolev, Manasa Kumar Rath, Konstantin Borodianskiy
Summary: A single-step wet-chemical synthesis method for NiO-SDC colloidal ink has been developed for inkjet printing of nanostructured anodic layers with enhanced catalytic activity in solid oxide fuel cells (SOFCs). The ink solution contains stable nanoparticles with a main size of 11.85 nm, which leads to a significant reduction in the area-specific resistance of the inkjet-printed half-cell. The microstructure engineering using inkjet printing results in a cermet layer with enhanced catalytic activity for SOFCs.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Hanieh Hesami, Mehdi Borji, Javad Rezapour
Summary: This study developed a three-dimensional model to simulate an internal reforming solid oxide fuel cell, finding that channel geometry has a significant impact on cell performance at low voltages. Additionally, adjusting the inlet fuel and air velocity can increase current density and power density.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Review
Physics, Multidisciplinary
Naiem Ahmed, Sangeeta Devi, Mohd Arif Dar, S. Kaleel Mohamed Ibrahim, Amit Sharma, Neha Sharma, Surinder Paul, S. Rafi Ahamed
Summary: Solid oxide fuel cell (SOFC) is an efficient technology that converts chemical energy into electrical energy without burning fuel. It consists of electrodes and electrolytes, and multiple cells are stacked together to generate high energy. SOFC operates by internally transporting O2- ions and utilizing common metals for rapid electrocatalysis. Additionally, it uses hydrogen for proton transportation. Yttrium-stabilized zirconia (YSZ) is the most frequently used solid electrolyte material in SOFC.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Energy & Fuels
Xin Xie, Heng Li, Shuang Cao, Chao Wu, Zhi Li, Baobao Chang, Gairong Chen, Xiaowei Guo, Tianjing Wu, Xianyou Wang
Summary: Surface modification with VOPO4 has been shown to enhance the electrochemical performance of Li1.2Mn0.54Ni0.13Co0.13O2, reducing surface residual Li+ content, inhibiting structural degradation, and preventing O-2 molecules from escaping during cycling. The modified sample Li1.2Mn0.54Ni0.13Co0.13O2@VOPO4 with 3 wt % VOPO4 exhibited an initial discharge capacity of 260.5 mAh g(-1) and excellent capacity retention of 92% after 100 cycles.
Article
Chemistry, Inorganic & Nuclear
Shiyu Yang, Ruizi Li, Zhentao Nie, Hongjian Zhang, Yu Zhang, Jixin Zhu
Summary: 2D N-doped V2O3 nanosheets were fabricated as anode materials for Li-ion batteries using a sol-gel method and a subsequent deoxidation-nitridation strategy. The N-V2O3 nanosheets exhibited improved Li+ diffusion kinetics, robust structure, and enhanced conductivity, leading to high specific capacity, long cycling life, and high rate capability.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Yan Zhang, Wei Zhao, Cong Kang, Shenglu Geng, Jiaming Zhu, Xiangjun Xiao, Yulin Ma, Hua Huo, Pengjian Zuo, Shuaifeng Lou, Geping Yin
Summary: The high operational capability of fast-charging lithium-ion batteries at low temperatures is crucial for power grid regulation in cold regions. By introducing a heterostructure-induced built-in electric field, the low-temperature performance of the battery has been significantly improved.
Article
Chemistry, Physical
Songjie Li, Jiazhe Gao, Yinjun Ou, Wenze Wang, Qian Zhang, Shangfu Gao, Xuehua Liu, Chunfu Lin
Summary: By introducing sintering aids with redox activity, Mo4Nb26O77 with submicron-sized primary particles was prepared using the solid-state reaction method at a low sintering temperature of 700 degrees C. The resulting material exhibited high electrochemical activity and a large practical capacity, making it suitable for high-performance Li+ storage.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Himani Thakur, Rajesh Kumar Singh, Arvind K. Gathania
Summary: In this study, GdVO4 doped with Eu3+ was synthesized using a sol-gel method, and the optical properties were analyzed with respect to concentration variation and annealing temperature. As the annealing temperature increased, the material's crystallinity improved, leading to enhanced emission intensity. The potential applications of GdVO4: Eu3+(1 mol%) annealed at 800 degrees C include bioimaging, lighting, temperature sensing, and display devices.
MATERIALS RESEARCH EXPRESS
(2021)
Correction
Energy & Fuels
Nitika Devi, Manoj Goswami, Mohit Saraf, Bhupendra Singh, Shaikh M. Mobin, Rajesh Kumar Singh, A. K. Srivastava, Surender Kumar
JOURNAL OF ENERGY STORAGE
(2021)
Review
Materials Science, Multidisciplinary
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh K. Singh, Wai Kian Tan, Stanislav A. Moshkalev, Atsunori Matsuda, Kamal K. Kar
Summary: Heteroatoms-doped graphene has made significant advancements in modern nanoscience and nanotechnology, particularly in electromagnetic shielding applications. The concept of heteroatom-doping in graphene is considered an efficient strategy for developing novel EMI shielding materials.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh K. Singh, Kamal K. Kar
Summary: This study mainly discusses the importance of microwave-assisted synthesis of carbon materials in energy storage applications, introducing the advantages of microwave processing and its application and effects in carbon material synthesis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Thermodynamics
Rajesh Kumar, Angel Perez del Pino, Sumanta Sahoo, Rajesh Kumar Singh, Wai Kian Tan, Kamal K. Kar, Atsunori Matsuda, Ednan Joanni
Summary: This review summarizes recent studies on laser-assisted synthesis and modification of graphene-based materials, as well as their application as electrodes for supercapacitors and batteries. It provides an overview of the physical properties of graphene and different types of laser processing operations, with a detailed discussion on the practical uses of laser techniques for fabricating electrode materials.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Chemistry, Physical
Rajesh Kumar, Ednan Joanni, Sumanta Sahoo, Jae-Jin Shim, Atsunori Matsuda, Wai Kian Tan, Rajesh K. Singh
Summary: This article provides a comprehensive overview of the fabrication and electrochemical performance of electrode materials for supercapacitors. It focuses on different-sized carbon nanomaterials and emerging fabrication technologies. The drawbacks of each electrode material, current technological challenges, and promising research directions are also discussed.
Article
Materials Science, Multidisciplinary
Dharmender S. Rana, Shiwani Kalia, Rajesh Kumar, Nagesh Thakur, Dilbag Singh, Rajesh K. Singh
Summary: In this research study, a heterostructure nanocomposite of reduced graphene oxide (rGO) and tungsten disulfide (WS2) separated by Fe3O4 nanoparticles was synthesized by microwave irradiation method for the detection of dopamine. The synthesized nanocomposite showed well-defined morphologies and crystallinity and exhibited low limit of detection and high sensitivity for dopamine.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shiwani Kalia, Dharmender S. Rana, Nagesh Thakur, Dilbag Singh, Rajesh Kumar, Rajesh Kumar Singh
Summary: Epinephrine molecule is crucial in neurotransmission and its concentration changes can lead to neurological disorders. The synthesized nanocomposite rGO-MoS2@Fe3O4 shows improved electrocatalytic properties and good sensitivity in detecting epinephrine levels, making it a promising method for disease diagnosis.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Review
Materials Science, Multidisciplinary
Nitika Devi, Rajesh Kumar, Shipra Singh, Rajesh Kumar Singh
Summary: The unique two-dimensional structure of graphene with large surface area, high conductivity, and good stability has opened up a new era in science and technology. This review focuses on the advanced applications of graphene and its composites in various fields. It provides an introduction to graphene and the major concerns associated with different synthesis methods. The review also discusses the effects of the number of layers on graphene's performance. Furthermore, it summarizes the properties of graphene and its characterization techniques, and delves into its applications in energy storage/conversion.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Review
Chemistry, Applied
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh Kumar Singh
Summary: This article introduces the advantages of microwave heating in the processing of graphene-based electrode materials and provides a systematic overview of recent research on microwave-assisted processing, focusing on the preparation and modification of graphene derivatives for supercapacitors. Finally, the major challenges and future perspectives for microwave-assisted processing of graphene-based materials are summarized.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Optics
Himani Thakur, Arvind K. Gathania, Santosh Kachhap, Sunil Kumar Singh, Rajesh Kumar Singh
Summary: The present work reports the coprecipitation synthesis and characterization of upconverting YPO4: Tm3+, Yb3+ phosphor. The structure and morphology of the synthesized phosphor were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Scanning electron microscopy (SEM). The upconversion luminescence properties of the prepared phosphor were studied under near-infrared (NIR) 980 nm laser excitation. The optimized concentration of Tm3+ (0.3 mol%)/Yb3+(10 mol%) showed intense and sharp emission in the NIR (-796 nm) region.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Multidisciplinary
Dharmender S. Rana, Shiwani Kalia, Nagesh Thakur, Rajesh K. Singh, Rajesh Kumar, Dilbag Singh
Summary: In this paper, we reported a facile synthesis method of reduced graphene oxide-molybdenum disulphide (rGO-MoS2) nanocomposites for electrochemical detection. The nanocomposites exhibited well-defined morphology, crystallinity, and a two-dimensional flat structure, which enhanced the detection limit and sensitivity of the sensor.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Shiwani Kalia, Amena Salim, Ritu Bala, Rajesh Kumar Singh, Rahul Singhal, Rajnish Dhiman
Summary: The surface modifications of graphene oxide (GO) based thin films using ion irradiation were investigated. It was found that higher fluence of ion irradiation transformed the GO matrix into amorphous carbon, leading to segregation of the Au thin layer into island type structures. The thin ion beam-modified nanocomposites thin films show potential applications in surface-enhanced spectroscopy, optical filters, and plasmonic devices.
Article
Physics, Multidisciplinary
Shiwani Kalia, Ritu Bala, Devendra Jain, Himmat Singh Kushwaha, Rajesh Kumar Singh, Rajnish Dhiman
Summary: The antibacterial activity of silver decorated reduced graphene oxide (Ag-rGO) nanocomposites against E. coli was investigated. The study found that the hydrothermal treatment temperature affects the morphology, particle size, and antibacterial activity of the nanocomposites, with samples treated at 150 degrees C showing the highest activity.
Review
Chemistry, Physical
Sumanta Sahoo, Rajesh Kumar, Ednan Joanni, Rajesh Kumar Singh, Jae-Jin Shim
Summary: This article systematically surveys the current state of the art regarding the fabrication and electrochemical performance of the most promising classes of pseudocapacitive/battery-type electrode materials for supercapacitors. It covers metal oxides, mixed metal oxides, conducting polymers, and MXenes. The article discusses outstanding problems for increasing the performance of supercapacitors and suggests future research directions.
JOURNAL OF MATERIALS CHEMISTRY A
(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)