Article
Energy & Fuels
Chi Zhang, Jialian Chen, Weixi Chen, Jinling Liu, Denglong Chen
Summary: This study reports the application of composite electrode materials composed of carbon materials and transition metal oxides as electrodes for supercapacitors. In situ N-doped activated carbon (NAC) was prepared by carbonization and KOH activation using polyurethane as raw material, and then hierarchical porous N-doped activated carbon (Cu2O/CuO@NAC) was prepared using Cu(CH3NOO)2 as copper source through impregnation adsorption and hydrothermal treatment. The Cu2O/CuO@NAC composites exhibit high specific surface area and 3D hierarchical porous structure, which is favorable for the capacitive performance, with a remarkable specific capacitance of 1393.4 F g-1 at a current density of 0.5 A g-1. Thus, the composite electrode materials of activated carbon and copper oxide have good prospects for application in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Environmental
Chunyu Chen, Lijuan Men, An Liu, Siyang Yu, Jiankang Zhou, Zihan Wei, Dianchun Ju
Summary: This study created and manufactured innovative electrode materials with enhanced electrochemical and capacitive deionization (CDI) performances. The composite electrode exhibited high specific capacitance, specific surface area, and salt adsorption capacity. It also demonstrated good cycle stability and reproducibility, making it a promising practical CDI electrode material for desalination.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Penggang Qi, Jiaxing Wang, Liren Yang, Yinhai Su, Wei Zhu, Mei Jiang, Xiaofei Sun, Ping Zhang, Yuanquan Xiong
Summary: This research synthesized a unique nanoscale pompon with structured porous carbon as core through a two-stage activation of H3PO4-K2C2O4 combined with hydrothermal self-assembly. The hierarchical porous carbon sample had a specific surface area of 1608.1 m2/g and a mesoporous ratio of 54.26%. Self-doped Co-Ni elements entered the channel of carbon core and formed a self-assembled nano pompon epidermis. Interleaving nanorods with unique characteristics were evenly grown on the surface, forming a 3D network structure with cavities, which exhibited excellent faradaic pseudocapacitance. The energy density and power density of the assembled asymmetric supercapacitor reached 30.4 Wh/kg and 1367.1 W/kg respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Qin Tang, Xianyong Chen, Dali Zhou, Can Liu
Summary: By utilizing wasted villi of bamboo shoot shell and KOH as green carbon source and chemical etching agent, the HPC/SiC composite material exhibited excellent specific capacitance and cycling performance. Additionally, this study demonstrated the formation of SiC in wasted VBSS under mild natural conditions, opening up new opportunities for the rational design of more efficient biomass-based supercapacitor materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Ming Shi, Yanfei Xin, Xinxing Chen, Kunyang Zou, Weitao Jing, Junjie Sun, Yuanzhen Chen, Yongning Liu
Summary: Porous activated carbon material derived from anthracite through KOH activation exhibits a large specific surface area and porous structure, making it suitable for electrode materials in supercapacitors and symmetric capacitors. The material shows high specific capacity, energy density, and superior cyclic stability, broadening the horizon of electrode materials for specialized hybrid supercapacitor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Fei Mo, Xiaoliang Wu
Summary: In this study, heteroatom-doped hierarchical porous carbon material was successfully prepared using a simple method. The obtained material has a three-dimensional interconnected porous structure, large specific surface area, and abundant nitrogen and oxygen functional groups. The optimized electrode exhibits high specific capacitance, excellent rate characteristics, and outstanding cycling performance. Furthermore, the assembled supercapacitor shows high energy density. The results demonstrate the promising application of the obtained hierarchical porous carbon material in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
Rui Liu, Jing-Xuan Wang, Wein-Duo Yang
Summary: In this study, hierarchical porous activated carbon was prepared using coconut husk biomass waste as the carbon precursor, and its electrochemical properties were investigated. The carbonization process variables and the resulting powder properties were examined. The as-prepared activated carbon electrode exhibited pseudo-capacitive behavior and achieved a specific capacitance of 186 F g(-1) at 1 A g(-1). After 7000 cycles of charge-discharge testing, the initial capacitance retention rate was 95.6%. It is predicted that capacitor materials made from coconut shell will have better energy storage performance than traditional carbon supercapacitors.
Article
Chemistry, Physical
Gaoxu Han, Jianbo Jia, Quanrun Liu, Guangxu Huang, Baolin Xing, Chuanxiang Zhang, Yijun Cao
Summary: A series of coal-based hierarchical porous carbons with adjustable pores were successfully prepared using Zinc chloride as a template during the carbonization process, leading to improved electrical conductivity and specific capacitance of the products.
Article
Materials Science, Coatings & Films
Sarika Jadhav, Ramchandra S. Kalubarme, Norihiro Suzuki, Chiaki Terashima, Bharat Kale, Suresh W. Gosavi, Muthupandian Ashokkumar, Akira Fujishima
Summary: A 3D porous hierarchical Co3O4-reduced graphene oxide nanosheet heterostructure was synthesized through a hydrothermal method, showing excellent specific capacitance in supercapacitors. The nanostructure analysis and Raman spectroscopy confirmed the potential application of this composite material in supercapacitor devices, demonstrating its promising performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Chong Chen, Mingkun Zhao, Yuyan Cai, Guangzhen Zhao, Yong Xie, Li Zhang, Guang Zhu, Likun Pan
Summary: In this study, porous carbon nanosheets with high specific surface area and rich surface heteroatoms were successfully synthesized, leading to high gravimetric/volumetric capacitance and energy density of the supercapacitor. This work provides a new strategy for the mass production of high-performance carbon nanosheets for energy storage.
Article
Chemistry, Analytical
Schindra Kumar Ray, Bishweshwar Pant, Mira Park, Bishnu Parsad Bastakoti
Summary: In this study, hierarchical porous biochar was synthesized from rice husk using one-step pyrolysis technique and NaOH chemical activation method. The NaOH activated biochar showed significantly enhanced specific surface area and specific capacitance, leading to improved performance of supercapacitors. The results suggest that NaOH treated biochar could be a promising low-cost electrode material for supercapacitor applications.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Physical
Guetae Kim, Bo-Hye Kim
Summary: Fabrication of one-dimensional hierarchical porous carbon nanofibers embedded with Co3O4 nanoparticles (PPMCo) by coaxial electrospinning followed by thermal treatment resulted in a structure with fast ion transport, large reaction surface area, and high rate capacity. The PPMCo supercapacitor electrodes demonstrated a high specific capacitance, rate capability, and cycling stability due to the synergistic effect of hierarchical porosity, Co3O4 electroactive material, high effective surface area, and polar effects by heteroatoms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Energy & Fuels
Fei Mo, Hongxue Zhang, Yangxin Wang, Chunxia Chen, Xiaoliang Wu
Summary: In this study, a facile method was developed to prepare heteroatom-doped hierarchical porous carbon with well-developed structure and high performance. The obtained carbon material showed great potential in achieving high energy density and superior cycle stability in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Biochemistry & Molecular Biology
Jiajun Li, Junyu Yang, Peiru Wang, Ziyang Cong, Feiyan Shi, Li Wei, Kai Wang, Yao Tong
Summary: In this study, NiCo2S4 nanoparticles were synthesized on hierarchical porous carbon (HPC) derived from enzymatic hydrolysis lignin using a solvothermal method. The composite electrode material exhibited outstanding electrochemical performance and energy storage capabilities.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Green & Sustainable Science & Technology
Weibo Huang, Diab Khalafallah, Chong Ouyang, Mingjia Zhi, Zhanglian Hong
Summary: This article introduces nitrogen and phosphorus self-doped hierarchical porous carbon (N/P-HPC) derived from yeast and phytic acid precursors, which have high specific surface area and large pore volume, suitable for supercapacitor applications. The electrochemical performance of N/P-HPC can be regulated by optimizing the composition and carbonization temperature. N/P-HPC shows a high specific capacitance of 432 F g-1 at 1 A g-1 and retains about 250 F g-1 at 20 A g-1 in 1.0 M H2SO4 electrolyte. The symmetric supercapacitor device assembled with N/P-HPC exhibits an energy density of 13.6 Wh kg-1 at 500 W kg-1 power density and maintains a large capacitance retention of 93.3% after 10,000 charge/discharge cycles at 10 A g-1 current density.
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)