Boosting Oer Activity of Cus by Anionic Doping

Abstract

AbstractsIt is of great significance for ushering in the hydrogen energy age to synthesize super active non-noble-metal electrocatalytic oxygen evolution reaction (OER). The large overpotential caused by the uneven electron transfer in the process of OER directly leads to a low hydrogen precipitation rate. Conventional precious metal electrocatalysts can’t be used on a large scale due to their high cost. Herein, we reported a P-doped low-cost and facile synthesized P-CuS as an electrocatalyst synthesized by a solvothermal strategy. Obtained more active sites offered the catalytic space that significantly lowered barriers to response, which results in the electrocatalyst exhibiting excellent catalytic activity. The overpotential of P-CuS-1 for optimal electrochemical performance was 280 mV @ 10 mA cm-2 and the Tafel slope was 138.24 mv dec-1. Additionally, the double-layer capacitance of the sample was calculated to be 17.77 mF cm-2, which increased by 15.21 mF cm-2 over the pre-doped CuS, along with good cycling stability upon 22 hours. Density functional theory calculations demonstrate that P-doping enhances OER activity by optimising the adsorption free energy of oxygenated intermediates. It indicated that P-doped CuS electrocatalyst can improve the OER electrochemical performance significantly compared to CuS. This study provides an effective way to tune the electronic structure of CuS using P-doping.

Keywords: CuS, Oxygen evolution reaction, P doping, Electrocatalyst, Density functional theory