Oxygen-induced electrode activation and modulation essence towards enhanced anode redox chemistry for vanadium flow batteries

doi:10.1016/j.ensm.2020.10.005

IMR OpenIR

	Oxygen-induced electrode activation and modulation essence towards enhanced anode redox chemistry for vanadium flow batteries
	Zhang, Kaiyue 1,2; Yan, Chuanwei 1; Tang, Ao 1
通讯作者	Tang, Ao(a.tang@imr.ac.cn)
	2021
发表期刊	ENERGY STORAGE MATERIALS
ISSN	2405-8297
卷号	34 页码:301-310
摘要	The vanadium flow battery (VFB) has seen a promising potential for use in large-scale energy storage. However, the sluggish anode redox chemistry still greatly limits the cycling performance of the VFBs. Herein, we realize an enhanced anode redox chemistry for the VFBs by tailoring the oxygen functional groups on carbon felts via a facile ozone-accelerated acid oxidation method, and more importantly uncover the modulation essence of p-band center in activated carbon felts. By introducing oxygen functional groups, the activated carbon felts exhibit both increased specific surface area and improved hydrophilicity over pristine carbon felts. Material and electrochemical characterizations indicate that an increased oxygen content in the carbon felts can substantially facilitate the V2+/V3+ redox kinetics. Benefiting from the enhanced V2+/V3+ kinetics, the VFB full cell delivers a superior energy efficiency of 72.8 % at 300 mA cm(-2), and a long-term cycling stability is also achieved over 600 consecutive charge-discharge cycles at 150 mA cm(-2) with only a 6.5% decay in energy efficiency. Most importantly, first principle calculations uncover that the oxygen function groups, especially carboxyl, can enhance the adsorption process but meanwhile to a certain extent suppress the charge transfer process for the V2+/V3+ redox reactions, which highlights the significance of delicate modulation of oxygen function groups on carbon felts to enhancing anode redox chemistry and full cell performance for the VFBs.
关键词	Vanadium flow battery Anode kinetics Oxygen functional group Carbon felt p-band center
资助者	National Natural Science Foundation of China ; Institute of Metal Research, Chinese Academy of Sciences
DOI	10.1016/j.ensm.2020.10.005
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[21706266] ; Institute of Metal Research, Chinese Academy of Sciences
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000598781200003
出版者	ELSEVIER
引用统计	被引频次：73[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/158734
专题	中国科学院金属研究所
通讯作者	Tang, Ao
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Kaiyue,Yan, Chuanwei,Tang, Ao. Oxygen-induced electrode activation and modulation essence towards enhanced anode redox chemistry for vanadium flow batteries[J]. ENERGY STORAGE MATERIALS,2021,34:301-310.
APA	Zhang, Kaiyue,Yan, Chuanwei,&Tang, Ao.(2021).Oxygen-induced electrode activation and modulation essence towards enhanced anode redox chemistry for vanadium flow batteries.ENERGY STORAGE MATERIALS,34,301-310.
MLA	Zhang, Kaiyue,et al."Oxygen-induced electrode activation and modulation essence towards enhanced anode redox chemistry for vanadium flow batteries".ENERGY STORAGE MATERIALS 34(2021):301-310.