A Novel Amorphous Cobalt Iron Borate Grown on Carbon Paper as Precatalysts for Water Oxidation.

Author(s) Cao, D.; Liu, H.; Yang, L.; Qiao, K.; Zheng, L.; Cao, X.
Journal ChemSusChem
Date Published 2019 May 27
Abstract

The key to improving water oxidation is to develop efficient and earth-abundant catalysts for oxygen evolution reaction (OER). Herein, we report a new member of amorphous cobalt iron borate supported on 3D carbon paper integrated electrode as precatalysts by one-pot hydrothermal synthesis. The optimized OER activity was obtained at 25% Fe doping by screening the compositions of the Co and Fe. The best synthesized catalyst needs an overpotential of 227 mV to deliver a current density of 10 mA/cm2 and also exhibits a long-term durability of 24 h. Impressively, we find that the CoFe oxyhydroxide was in situ formed in the OER process, serves as the real catalytic active species for OER. Moreover, the direct conversion from CoFe borate to CoFe oxyhydroxide is reported for the first time in metal borate OER catalysts. The discovery in this work i.e., metal borate as precursor can efficient catalyze OER in alkaline medium, significantly widen the family of OER catalysts.

DOI 10.1002/cssc.201901327
ISSN 1864-564X
Citation Cao D, Liu H, Yang L, Qiao K, Zheng L, Cao X. A Novel Amorphous Cobalt Iron Borate Grown on Carbon Paper as Precatalysts for Water Oxidation. ChemSusChem. 2019.

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