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Vanadium‐Ion Redox Reactions in a Three‐Dimensional Network of Reduced Graphite Oxide
Author(s) -
Maruyama Jun,
Shinagawa Tsutomu,
Hayashida Akihiro,
Matsuo Yoshiaki,
Nishihara Hirotomo,
Kyotani Takashi
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500543
Subject(s) - vanadium , redox , graphite , materials science , graphite oxide , carbon fibers , inorganic chemistry , dispersion (optics) , oxide , vanadium oxide , chemical engineering , chemistry , composite material , metallurgy , composite number , optics , physics , engineering
A three‐dimensional (3D) fine network structure of thin carbon microflakes inside a loosely entangled carbon‐fiber matrix was formed by applying an ice‐template method to a graphite oxide (GO) dispersion in the matrix and thermal reduction of the GO. Vanadium‐ion redox reactions were investigated in the network of reduced GO (RGO) for potential application as electrodes in vanadium redox flow batteries (VRFB). The development of the fineness, the degree of graphitization, the structural disorder, and the surface composition were characterized. The interaction between the carbon surface species and the vanadium ions was implied by the X‐ray absorption fine structure (XAFS). The structure of the 3D RGO network was clearly correlated to the activity for the VRFB positive electrode reactions, and the development of the fine network structure effectively enhanced the reactions due to increased exposure of the edge planes and sufficient dispersion of the active sites.