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A High‐Performance Composite Electrode for Vanadium Redox Flow Batteries
Author(s) -
Deng Qi,
Huang Peng,
Zhou WenXin,
Ma Qiang,
Zhou Nan,
Xie Hao,
Ling Wei,
Zhou ChunJiao,
Yin YaXia,
Wu XiongWei,
Lu XiangYang,
Guo YuGuo
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700461
Subject(s) - materials science , vanadium , flow battery , electrode , redox , graphene , composite number , current density , graphite , chemical engineering , oxide , vanadium oxide , inorganic chemistry , nanotechnology , composite material , metallurgy , chemistry , physics , electrolyte , engineering , quantum mechanics
A composite electrode composed of reduced graphene oxide‐graphite felt (rGO‐GF) with excellent electrocatalytic redox reversibility toward V 2+ /V 3+ and VO 2+ /VO 2 + redox couples in vanadium batteries was fabricated by a facile hydrothermal method. Compared with the pristine graphite felt (GF) electrode, the rGO‐GF composite electrode possesses abundant oxygen functional groups, high electron conductivity, and outstanding stability. Its corresponding energy efficiency and discharge capacity are significantly increased by 20% and 300%, respectively, at a high current density of 150 mA cm −2 . Moreover, a discharge capacity of 20 A h L −1 is obtained with a higher voltage efficiency (74.5%) and energy efficiency (72.0%), even at a large current density of 200 mA cm −2 . The prepared rGO‐GF composite electrode holds great promise as a high‐performance electrode for vanadium redox flow battery (VRFB).