Session: ENFL General Posters:

The exploration of earth-abundant and high-efficiency bifunctional electrocatalysts for overall water splitting is of vital importance for the future of hydrogen economy. Regulation of electronic structure through heteroatom-doping represents one of the most powerful strategies to boost the electrocatalytic performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a rational design of O-incorporated CoP (denoted as O-CoP) nanosheets, which synergistically integrate the favorable thermodynamics through modification of electronic structures with accelerated kinetics through nanostructuring. Experimental results and density functional theory (DFT) simulations manifest that the appropriate O incorporation into CoP could dramatically modulate the electronic structure of CoP and alter the adsorption free energies of reaction intermediates, thus promoting the HER and OER activities. Specifically, the optimized O-CoP nanosheets exhibit efficient bifunctional performance in alkaline electrolyte, requiring overpotentials of 98 and 310 mV to deliver a current density of 10 mA cm^-2 for HER and OER, respectively. When served as bifunctional electrocatalysts for overall water splitting, a low cell voltage of 1.60 V is needed for achieving a current density of 10 mA cm^-2. This proposed anion-doping strategy will bring new inspiration to boost the electrocatalytic performance of transition metal-based electrocatalysts for energy conversion applications.

A graphic abstract of the article.

Yawen Tang

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