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Your search keyword '"Chen, Gairong"' showing total 30 results
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30 results on '"Chen, Gairong"'

22. A Unique Structural Highly Compacted Binder‐Free Silicon‐Based Anode with High Electronic Conductivity for High‐Performance Lithium‐Ion Batteries

Author

Dong, Zhe, primary, Du, Wubin, additional, Gu, Haitao, additional, Long, Yingying, additional, Zhang, Chenyang, additional, Chen, Gairong, additional, Feng, Zhenhe, additional, Sun, Wenping, additional, Jiang, Yinzhu, additional, Liu, Yongfeng, additional, Yang, Yaxiong, additional, Gan, Jiantuo, additional, Gao, Mingxia, additional, and Pan, Hongge, additional

Published
2021
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23. Layer-opened graphene paper with carbon nanotubes as support in a flexible electrode material for supercapacitors

Author

Jie Yang, Changqing Miao, Lu Shi, Chen Gairong, Zhijun Zhang, Liujie Wang, Ma Zhihua, and Jingwei Zhang

Subjects
Materials science, chemistry.chemical_element, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, law.invention, symbols.namesake, law, Specific surface area, Materials Chemistry, Graphene oxide paper, Supercapacitor, Graphene, Mechanical Engineering, Metals and Alloys, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, Chemical engineering, chemistry, Mechanics of Materials, symbols, 0210 nano-technology, Raman spectroscopy, Carbon
Abstract

Graphene paper is a promising electrode material for use in flexible supercapacitors due to its good electronic conductivity and excellent mechanical characteristics. However, layers of graphene paper have a strong tendency to restack, resulting in a seriously reduced specific surface area and limited electrochemical performance. In this paper, restacked layers of graphene paper are reopened by a vacuum-assisted method, and carbon nanotubes (CNTs) are directly deposited on the enlarged space between the opened graphene layers. Consequently, an ordered carbon composite structure with alternately arranged graphene sheets and CNTs is constructed and exhibits increased specific surface area and a 3D conductive network. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and N2 adsorption/desorption measurements. The electrochemical performance was tested by galvanostatic charge-discharge test (GDC), electrochemical impedance spectroscopy (EIS) and cyclic voltammograms (CV). The obtained graphene/CNT paper exhibits a remarkably improved capacity of 170.8 F g−1, which is nearly two times higher than that obtained for a regular graphene paper.

Published
2019

26. A novel self-supported structure of Ce-UiO-66/TNF in a redox electrolyte with high supercapacitive performance

Author

Weiwei Li, Jie Yang, Chen Gairong, Lizhen Wang, Shuai Zhao, and Chen Leishan

Subjects
Supercapacitor, Materials science, Substrate (chemistry), 02 engineering and technology, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Capacitance, Redox, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Biomaterials, Colloid and Surface Chemistry, Chemical engineering, Specific surface area, Electrode, 0210 nano-technology
Abstract

A novel self-supported structure of Ce-UiO-66/TNF was firstly synthesized by growing Ce-UiO-66 on a TNF substrate. This novel Ce-UiO-66/TNF material was proved to possess a high supercapacitive performance in the redox electrolyte of Fe(CN)63−/4−, and it was also the first study for Ce-UiO-66 material on the supercapacitor application. High specific capacitances of 6.9 and 2.5 Fcm−2 can be achieved at large current densities of 20 and 80 mAcm−2, respectively. After 10,000 charge-discharge cycles, the capacitance retention can be kept at 95% and the coulomb efficiency can be maintained over 98%. Such outstanding electrochemical performance may be related to the redox property of the electrolyte, high specific surface area of the Ce-UiO-66 material, porous characteristic of the TNF substrate and self-supported structure of the whole electrode.

Published
2020

30. Photo-induced self-catalysis of nano-Bi 2 MoO 6 for solar energy harvesting and charge storage.

Author

Si J, Guo C, Liu H, Li W, Guo X, Bai P, Liu Y, Chen G, and Sun N

Abstract

Efficient, sustainable, and integrated energy systems require the development of novel multifunctional materials to simultaneously achieve solar energy harvesting and charge storage. Bi-based oxysalt aurivillius phase materials are potential candidates due to their typical photovoltaic effect and their pseudo-capacitance charge storage behavior. Herein, we synthesized nano-Bi 2 MoO 6 as a material for both solar energy harvesting and charge storage due to its suitable band gap for absorption of visible light and its well-defined faradaic redox reaction from Bi metal to Bi 3+ . The irradiation of visible light significantly affected the electrochemical processes and the dynamics of the Bi 2 MoO 6 electrode. The photo-induced self-catalytic redox mechanism was carefully explored by adding sacrificial agents in photocatalysis reaction. In accordance with the rule of energy matching, the photo-generated holes oxidized the Bi metal to Bi 3+ , and the corresponding peak current increased by 79.5% at a scanning rate of 50 mV s -1 . More importantly, the peak current retention rate remained higher than 92.5% during the entire 200 cycles. The photo-generated electrons facilitated a decrease of 184 mV in the overpotential of the reduction process. Furthermore, the irradiation of visible light also accelerated the ionic diffusion of the electrolyte. These investigations provide a unique perspective for the design and development of new multifunctional materials to synergistically realize solar energy harvesting and charge storage., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2020
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