Theoretical investigation of CoTa₂O₆/graphene heterojunctions for oxygen evolution reaction

Abstract

Water electrolysis is to split water into hydrogen and oxygen using electricity as the driving force. To obtain low-cost hydrogen in a large scale, it is critical to develop electrocatalysts based on earth abundant elements with a high efficiency. This computational work started with Cobalt on CoTa₂O₆ surface as the active site, CoTa₂O₆/Graphene heterojunctions have been explored as potential oxygen evolution reaction (OER) catalysts through density functional theory (DFT). We demonstrated that the electron transfer (δ) from CoTa₂O₆ to graphene substrate can be utilized to boost the reactivity of Co-site, leading to an OER overpotential as low as 0.30 V when N-doped graphene is employed. Our findings offer novel design of heterojunctions as high performance OER catalysts.

Keywords

CoTa₂O₆ / OER / charge transfer / DFT / heterojunctions

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