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Graphite Felts Modified by Vertical Two-Dimensional WO3 Nanowall Arrays: High-Performance Electrode Materials for Cerium-Based Redox Flow Batteries

Abstract

The cerium-based redox flow batteries (RFBs) is very attractive for highly efficient energy storage applications with industrial-scale storage capacity, but the development of active, stable, and earth-abundant catalysts for the cerium redox reactions with sluggish kinetics remains a major challenge. Herein, for the first time, 2D nanostructured architectures are used to design and fabricate efficient and stable electrocatalysts toward the Ce(IV)/Ce(III) redox couple from earth-abundant components. A novel WO3/GF hybrid architecture (WGF) built from WO3 nanowall arrays (NWAs) anchored on graphite felt (GF) surfaces is prepared for cerium-based RFBs. This unique hybrid exhibits superior electrocatalytic performance, since the vertical nanowall arrays showing open and ordered structures, ensure fully exposing active sites toward electrolytes, which allows direct and full contact of every nanowall with electrolyte. As an electrode for cerium redox reactions, this WGF electrode exhibits a 42.1% and 32.0% increase in energy efficiency as compared with the pristine GF and acidly treated GF at a high charge/discharge rate of 30 mA cm-2. Moreover, the long-term cycling performance confirms the superior durability of the as-prepared WGF. This work suggests that 2D nanostructure combined with vertical array microstructure is a promising strategy for efficient electrocatalysts toward cerium redox reactions with scale-up potential.

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Publication details

The article was received on 14 Feb 2018, accepted on 14 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8NR01345D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Graphite Felts Modified by Vertical Two-Dimensional WO3 Nanowall Arrays: High-Performance Electrode Materials for Cerium-Based Redox Flow Batteries

    Z. Na, X. Wang, D. Yin and L. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01345D

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