Crystal phase engineering boosted photo-electrochemical kinetics of CoSe for oxygen evolution catalysis.

J Colloid Interface Sci

Institute for Energy Research, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China. Electronic address:

Published: April 2022

Crystal phase is an important parameter that can determine the electronic structure and catalytic properties of catalysts. In this work, we report the crystal phase dependent photo- and electrocatalytic oxygen evolution reaction (OER) performance of CoSe. In electrocatalytic reaction, we firstly found that CoSe with orthorhombic phase (o-CoSe) showed a higher OER performance than that of CoSe with cubic phase (c-CoSe). In the further exploration of photocatalytic application using FeO as light harvester and CoSe as cocatalysts, o-CoSe/FeO can realize the qualitative changes of photocatalytic oxygen evolution performance from "0″ to "1". As contrast, c-CoSe/FeO cannot work in photocatalytic oxygen evolution process under the same condition. Experimental and theoretical analysis uncover that, the key factor leading to the crystal phase-dependent performance is the decreased activation barrier of HO on o-CoSe surface. This work opens up an opportunity of correlating the CoSe crystal phase with performance in OER.

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http://dx.doi.org/10.1016/j.jcis.2021.12.026DOI Listing

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