Abstract
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 CoSe2. In electrocatalytic reaction, we firstly found that CoSe2 with orthorhombic phase (o-CoSe2) showed a higher OER performance than that of CoSe2 with cubic phase (c-CoSe2). In the further exploration of photocatalytic application using Fe2O3 as light harvester and CoSe2 as cocatalysts, o-CoSe2/Fe2O3 can realize the qualitative changes of photocatalytic oxygen evolution performance from “0″ to “1”. As contrast, c-CoSe2/Fe2O3 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 H2O on o-CoSe2 surface. This work opens up an opportunity of correlating the CoSe2 crystal phase with performance in OER.
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