Article
Thermodynamics
Jose J. Quintana, Alejandro Ramos, Moises Diaz, Ignacio Nuez
Summary: This study proposes a theoretical and practical analysis of the energy efficiency of supercapacitors according to their working voltages. By conducting charge-discharge cycles with and without rest between the stages, the ideal working voltages to optimize energy efficiency can be determined.
Article
Energy & Fuels
L. E. Helseth
Summary: This paper discusses how to extract consistent capacitance values from measurements obtained with three different techniques, and how to interpret these values. It also compares the advantages and disadvantages of different methods, as well as how to eliminate systematic errors. Additionally, it briefly discusses the extension of the methods to pseudocapacitors utilizing both Faradaic and non-Faradaic charge storage.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Engineering, Electrical & Electronic
Kapuralage Wathsala Prasadini, Kumudu S. Perera, Kamal P. Vidanapathirana
Summary: The study fabricated a redox capacitor with an ionic liquid-based gel polymer electrolyte, showing high specific capacitance and good stability, but exhibiting degradation during cycling.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Yachao Zhu, Guoshen Yang, Xuhao Wan, Jie Deng, Tobias F. Burton, Siraprapha Deebansok, Dodzi Zigah, Hang Zhou, Yuzheng Guo, Olivier Fontaine
Summary: A new redox mediator, Thionine, was used as a supercapacitor electrolyte in highly concentrated LiTFSI to investigate the charging mechanisms in mesoporous materials. The presence of Th modified the viscosity and thermal properties of the electrolyte without affecting its ionic conductivity. Molecular Dynamics (MD) and Density Functional Theory (DFT) simulations revealed the adsorption and charging mechanisms of Thionine in mesoporous carbon.
ENERGY STORAGE MATERIALS
(2023)
Article
Energy & Fuels
Sangram Gite, R. S. Ambekar, S. B. Abrish Aaditya, Sarang Joshi, P. B. Karandikar
Summary: Energy primarily exists in the form of electricity for human use, requiring energy storage devices for its storage. Asymmetrical supercapacitors, with horizontally configured electrodes, show promise to replace traditional energy storage devices. This paper analyzes the performance of asymmetrical supercapacitors through statistical modeling, providing insights into how electrode parameters interact and impact specific capacitance. The findings can serve as a basis for studying other electrical energy storage devices such as batteries and fuel cells.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Deepu Jha, Vispi Nevile Karkaria, P. B. Karandikar, R. S. Desai
Summary: Energy is crucial for machines to work according to human needs. Different forms of energy, such as solar energy, wind energy, and geo thermal energy, can be utilized. However, the effective use of energy depends on application requirements, energy converters, energy sources, and energy storage systems. Energy storage devices, such as batteries, fuel cells, and supercapacitors, are needed to store and supply energy as needed. The modeling of hybrid supercapacitors can be a game-changer in the energy sector, combining the characteristics of both batteries and supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
L. E. Helseth
Summary: In this study, systematic experimental research was conducted on the nonlinearity of galvanostatic charging curves for commercial supercapacitors. A consistent theory was developed to explain the available data, attributing the nonlinearity to a constant capacitance in parallel with a resistance. The influence of faradaic charge transfer reactions and surface charge reorganization on this parallel resistance was analyzed. The proposed theory was also used to analyze galvanostatic charging data from previous studies, providing new insights into the charging mechanisms of different types of supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Keyvan Malaie, Mohammad Reza Ganjali
Summary: Spinel nano-ferrites are versatile metal oxides with unique properties, making them promising materials for sustainable energy applications. Recent studies have focused on their use as electrodes in supercapacitors, with different ferrites showing varying electrochemical behaviors in aqueous electrolytes.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Jalal Azadmanjiri, Lukas Dekanovsky, Shuangying Wei, Min Li, Zdenek Sofer
Summary: Covalent surface modification of two-dimensional nanomaterials is crucial for tuning their properties. In this study, Ti3C2Tx nanosheets were successfully modified with selenium, resulting in improved capacitance, energy density, and power density in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Agricultural Engineering
Meng Zhang, Yaxin Duan, Ting Chen, Junjie Qi, Ting Xu, Haishun Du, Chuanling Si
Summary: Due to its natural biodegradability and bio-renewability, lignocellulose has attracted significant interest in the field of energy storage. It can be used as electrolytes, electrodes, separators, and binders in supercapacitors and batteries, thanks to its porous structure, good thermal and chemical stability, and tunable surface chemistry. The fabrication of lignocellulose-based materials for energy storage applications, including solid-state electrolytes, flexible electrodes, sustainable binders, and separators, is discussed in this review. The challenges and potential solutions for lignocellulose-based materials in the future are also presented.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Review
Energy & Fuels
Shivam Rawat, Chin-Tsan Wang, Chyi-How Lay, Srinivas Hotha, Thallada Bhaskar
Summary: Biochar is a carbon-rich solid derived from biomass through thermal treatment in an oxygen-limited environment. Its structural and electrochemical properties can be optimized through customization techniques like increasing porosity, enlarging surface area, enhancing graphitization, and modifying surface functionalities with heteroatoms. This review mainly focuses on the preparation strategies of biochar-based materials for energy and hydrogen storage, as well as the tuning and optimization of their structural properties for specific applications. The hierarchical porous structure with heteroatom surface functionalities is desirable for supercapacitor application, while the graphitic structure and interlayer spacing are critical for battery applications. High surface area, micropore-dominant structure, and oxygen-rich functional groups are required for H2 storage in biochar.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Ceramics
Behnam Chameh, Negin Khosroshahi, Mahnaz Bakhtian, Morteza Moradi, Vahid Safarifard
Summary: This study successfully synthesized MOF-derived metal oxide/spinel metal oxide nanocomposites and modified them with pure and oxidized g-C3N4. The modified nanocomposites showed excellent supercapacitor and oxygen reduction reaction (ORR) performance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Jianfeng Wen, Bingang Xu, Yuanyuan Gao, Meiqi Li, Hong Fu
Summary: The importance of flexible and wearable energy storage devices is highlighted, focusing on the advantages and progress of textile substrate and wearable technology derived supercapacitors. Strategies for performance improvement are proposed to overcome current challenges and pave the way for future development of flexible and wearable supercapacitors.
ENERGY STORAGE MATERIALS
(2021)
Article
Multidisciplinary Sciences
Zhengxin Zhu, Zaichun Liu, Yichen Yin, Yuan Yuan, Yahan Meng, Taoli Jiang, Qia Peng, Weiping Wang, Wei Chen
Summary: The authors report an electrocatalytic hydrogen gas capacitor with improved specific energy, which can operate in pH-universal aqueous electrolyte solutions and a wide temperature range.
NATURE COMMUNICATIONS
(2022)
Article
Agricultural Engineering
Chandan Kumar Maity, Shrabani De, Kartikey Verma, Md Moniruzzaman, Sumanta Sahoo
Summary: Energy storage devices are of great importance in modern science and technology due to global population growth and environmental pollution. Developing renewable energy storage devices using sustainable materials is a critical challenge. Nanocellulose and its derivatives have been widely explored in secondary batteries and supercapacitors. This review article discusses the current developments, characteristics, synthetic approaches, application forecasts, advantages, and future prospects of nanocellulose for energy storage technologies.
INDUSTRIAL CROPS AND PRODUCTS
(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)