Article
Chemistry, Physical
Shaoyun Chen, Huan Cheng, Du Tian, Qi Li, Min Zhong, Jian Chen, Chenglong Hu, Hongbing Ji
Summary: The study successfully prepared core-shell PPy@PANI nanospheres with excellent electrochemical performance as electrode materials for supercapacitors. The thickness of the PANI shell and the sea urchin-like shape of PANI have important effects on the specific capacitance and performance of the nanospheres.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Karim Kakaei, Somayyeh Khodadoost, Maryam Gholipour, Nazila Shouraei
Summary: A green electrochemical approach was developed for the fabrication of PANI nanofiber and C-dots nanoparticles, with the composite material showing good performance in supercapacitors. The addition of C-dots to the PANI matrix enhanced the charge transport manner, leading to higher supercapacitor properties of the composite materials.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Zhao Zhuang, Wenjiao Wang, Yudi Wei, Tingxi Li, Mingliang Ma, Yong Ma
Summary: A hierarchical PANI/MnO2 core/shell nanostructure was successfully constructed through in situ polymerization, effectively increasing active surface areas and decreasing ion transmission distance. The nanostructure exhibited better electrochemical activity and higher capacitance performance compared to pure PANI nanorods and pure MnO2.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Energy & Fuels
Jing Pan, Shaobin Li, Li Zhang, Tingting Yu, Fengbo Li, Wenzhi Zhang, Jianxin Wang, Deqing Zhang, Yan Yu, Xin Li
Summary: Design and synthesis of a novel core-shell structured composite material has been demonstrated, showing excellent electrochemical properties and cycling stability in energy storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Nanoscience & Nanotechnology
Leqiu He, Yan Wang, Yajie Guo, Guobing Li, Xubin Zhang, Wangfeng Cai
Summary: In this study, a core-shell nanostructure electrode consisting of NiSe nanorods and Ni(OH)(2) nanosheets was successfully fabricated using a one-step hydrothermal process and electrodeposition. The material showed excellent energy and power densities, indicating its great potential as a battery-type electrode in energy storage systems.
Article
Chemistry, Physical
Luchi Wang, Xiaoman Wang, Jie Ouyang, Yuhang Guo, Wanning Xiong, Linlin Zhao, Mengyao Li, Ziheng Hua, Zejun Li, Kun Du, Cui Zhou, Yongfeng Luo
Summary: Polyaniline (PANI) nanomaterials or carbon nanotubes (CNTs) are synthesized on activated wood carbon (AWC) to obtain PANI@AWC and CNT@AWC. MnO2 nanosheets are then electrodeposited on PANI nanomaterials to form a core-shell structure. The introduction of PANI improves loading of MnO2, electrical conductivity, structural stability, and synergistic energy storage. Using the MnO2/ PANI@AWC composite electrode as an anode and CNT@AWC as a cathode, a high-performance all-solid-state supercapacitor is constructed with wide working voltage and high energy density.
APPLIED SURFACE SCIENCE
(2023)
Article
Electrochemistry
Ruiying Wang, Weijun Li, Lan Jiang, Qiao Liu, Lin Wang, Bin Tang, Weiyou Yang
Summary: This study reports the exploration of electrodes based on hierarchical SiC@polyaniline (SiC@PANI) core/shell nanowire arrays, which exhibit high specific capacitance, good rate performance, and high stability. The excellent electrochemical performance of the electrode is mainly attributed to the rational design and the combination of advantages from SiC and PANI.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Yanqing Hu, Shijie Yu, Xinyi Deng, Jiaqiang Zhou, Rui Zhang, Qiyue Shao
Summary: This research discovers the opposite temperature-dependence of upconversion luminescence (UCL) in active-shell and inert-shell nanocrystals. The UCL of active-shell nanocrystals is enhanced at elevated temperature, while the UCL of inert-shell nanocrystals declines. This phenomenon is mainly attributed to the gradually attenuated surface quenching effect induced by H2O molecules.
Article
Materials Science, Ceramics
Muhammad Naveed ur Rehman, Tauseef Munawar, Muhammad Shahid Nadeem, Faisal Mukhtar, Adnan Maqbool, Muhammad Riaz, Sumaira Manzoor, Muhammad Naeem Ashiq, Faisal Iqbal
Summary: In this study, metal oxide nanoparticles and their composites with conducting polymers were successfully synthesized and characterized using various analytical techniques. The quaternary nanocomposite showed higher conductivity and specific capacitance, along with lower polarization resistance and solution resistance. This enhances surface-dependent electrochemical properties and provides a novel research idea for the manufacturing of supercapacitor electrode materials.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Donghao Zheng, Geping He, Yuanmei Mi, Huijun Huang Fu, Yanxia Li, Huimin Zhang, Minye Wu, Hudie Yuan
Summary: Core-shell structured composite materials of MoSe2 hollow microspheres and PANI rods were prepared by silica template hydrothermal method, which exhibited improved electrochemical energy storage performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Polymer Science
Sami Ur Rahman, Philipp Roese, Anwar ul Haq Ali Shah, Ulrike Krewer, Salma Bilal, Shehna Farooq
Summary: This study demonstrates the surface modification of fluorine doped tin oxide (FTO) with sodium phytate doped PANI without any binder for use as a novel current collector in symmetric supercapacitor devices. The electrode without a binder exhibited higher electrocatalytic efficiency, leading to an efficient energy storage device with high specific capacities and excellent cycling stability. The supercapacitor showed remarkably high gravimetric energy and power density, remaining stable as power density increased, highlighting its potential for practical applications.
Article
Energy & Fuels
Vinayak G. Parale, Taehee Kim, Amar M. Patil, Varsha D. Phadtare, Haryeong Choi, Rushikesh P. Dhavale, Younghun Kim, Seong Chan Jun, Hyung-Ho Park
Summary: The study proposed a NiCo2S4@MnOx electrode with high specific capacitance and cycling stability, exhibiting excellent electrochemical properties.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Junhao Cai, Jianrui Cao, Heng Tao, Ruoping Li, Mingju Huang
Summary: A novel 3D core-shell nanostructure decorated with plasmonic Au nanoparticles was prepared for efficient photoelectrochemical water splitting, achieving a photoconversion efficiency and photocurrent density 4.80 and 4.33 times higher than ZnO nanosheets, respectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Sara Pakseresht, Tugrul Cetinkaya, Ahmed Waleed Majeed Al-Ogaili, Hatem Akbulut
Summary: The integrated design of urchin-like core-shell TiO2/alpha-MnO2 nanostructure was constructed for efficient catalyst electrode development in Li-O-2 batteries. The TiO2/alpha-MnO2 electrode exhibited lower overpotential and higher specific capacity, possibly due to the bifunctional catalytic activity of TiO2 and alpha-MnO2 coupled with urchin-like MnO2 nanostructures.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Pingping Yao, Chenyang Li, Jiali Yu, Shuo Zhang, Meng Zhang, Huichao Liu, Muwei Ji, Guangtao Cong, Tao Zhang, Caizhen Zhu, Jian Xu
Summary: A novel flexible electrode with a unique core-shell holey nanostructure and improved conductivity demonstrates excellent energy storage performance, providing a large number of active sites and fast electron transport pathway. The electrode exhibits high specific areal capacitance at a current density of 2 mA cm(-2), outperforming most of the flexible electrodes reported recently. The assembled asymmetric supercapacitor shows high energy density and power density under a working voltage window of 1.7 V, with outstanding flexibility and cycling stability.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Minju Kim, Jiweon Kim, Jieun Bang, Yu Jin Jang, JaeHong Park, Dong Ha Kim
Summary: In this study, a novel strategy is developed to fabricate chiral hybrid halide perovskite nanocrystals (NCs) based on block copolymer inverse micelles. The selective occupation of perovskite precursors within chiral micellar cores ensures efficient chirality transfer, resulting in high chiroptical response and circularly polarized luminescence performance. The robust surface encapsulation by block copolymer inverse micelles also provides effective protection for the perovskite NCs against moisture, heat, and air.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Dong Guang Zheng, Dong Ha Kim
Summary: Metal-halide perovskite light-emitting diodes (PeLEDs) are efficient luminescent materials, but their performance and stability still need improvement. Understanding degradation mechanisms can help optimize strategies for better performance and stability.
Article
Chemistry, Physical
Un-Hyuck Kim, Tae-Yeon Yu, Jin Wook Lee, Han Uk Lee, Ilias Belharouak, Chong Seung Yoon, Yang-Kook Sun
Summary: Electric vehicles powered by Li-ion batteries can be dangerous due to the flammable liquid electrolytes, but all-solid-state batteries offer a safe alternative. This study demonstrates that B-doping and coating of a Ni-rich Li[Ni0.9Co0.05Mn0.05]-O2 cathode can enhance the microstructure and cathode-solid electrolyte interface, resulting in an all-solid-state battery that cycles stably for 300 cycles with minimal capacity fading. The B-doped, B-coated Li[Ni0.9Co0.05Mn0.05]O2 cathode achieves a discharge capacity of 214 mAh g-1, one of the highest among all-solid-state batteries, and retains 91% of its initial capacity after 300 cycles, surpassing previously reported all-solid-state batteries in terms of energy density without compromising cycling stability.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Minju Kim, Jiweon Kim, Hyun Jeong Lee, Hyeohn Kim, Ki Tae Nam, Dong Ha Kim
Summary: In this study, a general approach to fabricate chiral metal oxide nanostructures with tunable magneto-chiral effects using block copolymer inverse micelle and R/S-mandelic acid was reported. The study found that diverse chiral metal oxide nanostructures can be prepared by selective incorporation of precursors within micellar cores followed by the oxidation process, exhibiting intense chiroptical properties. This approach can also be used for mass production of chiral nanostructures with tunable architectures and optical activities.
Article
Chemistry, Physical
Minju Kim, Mohammed O. Bazaid, Hyun Jeong Lee, Seung Soon Jang, Yu Jin Jang, Dong Ha Kim
Summary: The self-assembly technique based on block copolymer (BCP) templates provides a simple and generalized route for the synthesis of diverse chiral inorganic nanoparticles (NPs). The BCP inverse micelles offer a specific environment where DL-alanine induces left-handedness through hydrogen bonding, and this chirality is transferred to the anchored inorganic NPs using BCPs as a chiral host. This design concept provides a step-by-step guide for constructing a viable library of chiral nanostructures and aids in the development of artificial chiral materials.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ilgeum Lee, Omar Allam, Jiweon Kim, Yixuan Dou, Hyungju Ahn, Andrew Proppe, Yitong Dong, Dongxin Ma, Li Na Quan, Edward H. Sargent, Seung Soon Jang, Dong Ha Kim
Summary: Efficient blue-emitting materials with single-halide RPPs using organic spacer engineering are reported in this study. The (110)-oriented thin films exhibit larger bandgap and enhanced stability, regardless of the choice of spacers, compared to other structures. This new class of RPPs exhibits sky-blue emission at 483 nm with a quantum efficiency of approximately 62%. The established protocol and strategy can be utilized to develop blue perovskite LEDs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Hun Kim, Su-Hyun Lee, Jae-Min Kim, Chong Seung Yoon, Yang-Kook Sun
Summary: In this study, a carbonate-electrolyte-based Li-metal battery with high areal capacity and long cycle life is proposed. The cycling stability is improved by applying external compressive pressure and a boehmite-coated separator, resulting in 82% retention of initial capacity after 500 cycles. This research provides important insights for realizing high-energy-density Li-metal batteries and demonstrates the potential of employing cell compression to increase battery life and energy density.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jeonguk Hwang, Sanghyun Lee, Sucheol Kim, Kwanghyun Do, Sungwook Kim, Hyeonmin Jo, Hee-Dae Lim, Heejoon Ahn
Summary: Graphene encapsulation is a promising surface-coating technology that can enhance both the rate capability and cycle stability of nickel-rich LiNixCoyMn1-x-yO2 (NCM). Addition of polyethylenimine (PEI) and polyhedral oligomeric silsesquioxane (POSS) in the carbon layer effectively prevents the formation of harmful factors in the electrolyte, thereby maximizing the electrochemical performance of NCM.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Sanghyun Lee, Jeonguk Hwang, Changyong Park, Suhyun Ahn, Kwanghyun Do, Sungwook Kim, Heejoon Ahn
Summary: In this study, metallic 1T phase molybdenum disulfide (MoS2) nanosheets were synthesized and uniformly coated on the surface of Ni-rich LiNi1-x-yCoxMnyO2 (NCM) particles through electrostatic interactions. The MoS2-PEI layer effectively alleviated the electrochemical performance degradation of NCM caused by irreversible phase transitions, microcrack formation, transition metal dissolution, and thick cathode electrolyte interface (CEI) layer formation by suppressing side reactions. Moreover, the MoS2-PEI layer provided a sufficient transport pathway for charge transfer and Li+ ion diffusion, thereby mitigating electrode polarization and impedance increase. The NCM/ceMoS2-PEI electrodes exhibited high discharge capacity and outstanding capacity retention.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Hun Kim, Ha-Neul Choi, Jang-Yeon Hwang, Chong Seung Yoon, Yang-Kook Sun
Summary: An inorganic Li-ion-conducting species is incorporated between sulfur (S-8) and the sulfide solid electrolyte (SSE) to enhance the ionic contact, improving the performance of all-solid-state lithium-sulfur batteries (ASSLSBs). The addition of a weakly polar solvent promotes interfacial chemical reactions, enhancing the wettability of the solid electrolyte towards the active material. This results in a high-performance ASSLSB with high areal capacity and promising lifetime.
ACS ENERGY LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Sandip Kumar De, Dong-Il Won, Jeongwon Kim, Dong Ha Kim
Summary: Coupling post-combustion CO2 capture with electrochemical utilization (CCU) is a breakthrough in renewable energy science as it eliminates the cost and energy involved in the transportation and storage of CO2. The major challenges include selecting an appropriate solvent/electrolyte for CO2 capture, modeling the infrastructure for CO2 reduction reaction (CO2RR), and selecting a suitable electrocatalyst. This review focuses on the difficulties and mechanisms involved in integrating electrochemical CCU to achieve higher-value products, and also discusses the techno-economic evolution for industrial-scale implementation.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Physical
Haeji Hong, Ho Young Kim, Won Il Cho, Ho Chang Song, Hyung Chul Ham, Kyunghee Chae, Filipe Marques Mota, Jin Young Kim, Dong Ha Kim
Summary: Alkaline water electrolysis is a promising technology for green-hydrogen production. MXenes, with their distinctive properties, are assessed as support materials for Pt-loaded alkaline HER catalysts. OH-functionalized Pt/Ti3C2(OH)(x) shows the highest HER activity due to the cooperative effects of extended MXene surface area and interactions between Pt and Ti(OH)(x) surface centers. The superior activity is supported by density functional theory calculations.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Se Hun Lee, Jeonguk Hwang, Chiho Song, Changyong Park, Hyung-Seok Kim, Heejoon Ahn
Summary: This study presents the development of highly stretchable and cycle-stable zinc-ion microbatteries. By incorporating conducting polymer-intercalated cathode materials, wavy-type microdevice construction, and pre-zincation techniques, the researchers achieved high specific capacity, energy density, and power density for the microbatteries. They also demonstrated excellent stretchability and stability under extreme environments.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yujing Ren, Jinyong Wang, Mingyue Zhang, Yuqing Wang, Yuan Cao, Dong Ha Kim, Zhiqun Lin
Summary: Single-atom catalysts face limitations in their practical applications, but arranging randomly dispersed single atoms into locally ordered single-atom catalysts (LO-SACs) can greatly enhance their performance and simplify reaction mechanisms. This review comprehensively introduces the characteristics, synthetic strategies, characterization methods, and applications of LO-SACs in electrocatalysis, as well as the future opportunities and challenges.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Sanghyun Lee, Jeonguk Hwang, Changyong Park, Suhyun Ahn, Kwanghyun Do, Sungwook Kim, Kangmin Lee, Se Hun Lee, Rahul R. Salunkhe, Heejoon Ahn
Summary: In this study, defect-engineered composite cathode materials were designed and fabricated to achieve high capacity and good cycling stability for AZIBs batteries. By intercalating NH4+ and H2O as pillars to stabilize the layered structure, and providing conductive networks with 1T-MoS2 nanosheets, the charge transfer and reversible intercalation performance were enhanced during the charging-discharging process.
APPLIED SURFACE SCIENCE
(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)