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Enhancing the Catalytic Kinetics of Electrodes by using a Multidimensional Carbon Network for Applications in Vanadium Redox Flow Batteries
Author(s) -
Zhang Lei,
Ma Qiang,
Hu JunPing,
Liu Jun,
Deng Qi,
Ning Pan,
Zhou Congshan,
Wu Xiongwei,
Wu Yuping
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201902131
Subject(s) - electrode , vanadium , redox , flow battery , composite number , materials science , inert , chemical engineering , carbon fibers , diffusion , graphite , inorganic chemistry , chemistry , composite material , organic chemistry , engineering , electrolyte , physics , thermodynamics
Composite graphite felt (GF) electrodes modified by using a carbon network are fabricated for vanadium redox flow batteries (VRFBs). The electrodes are derived through the in situ polymerization of p‐phenylenediamine and phytic acid on GF fibers, followed by high‐temperature calcinations performed in an inert atmosphere. The composite electrodes exhibited higher electrocatalytic activities for the VO 2+ /VO 2 + and V 2+ /V 3+ redox species compared with the original GF electrode. The peak potential was reduced by 357 mV, which could be attributed to the increased number of active sites and diffusion pathways; the energy efficiency of the composite electrode increased by 6 % (current density: 200 mA cm −2 ). Based on the above‐mentioned structural design, a battery containing the composite electrodes exhibited excellent cycling stability without any obvious efficiency decay after 1000 cycles, indicating its applicability for large‐scale VRFBs.