NiCoP selenization for enhanced oxygen evolution reaction in alkaline electrolyte

Abstract

The electrocatalytic performance of bimetallic NiCo phosphide for oxygen evolution can be boosted via facile selenization by forming a crystal structure of metal phosphide and metal selenide. In the alkaline electrolyte, small overpotentials of 280 mV to drive 10 mA cm−2 were required, much smaller than that of NiCo phosphide and NiCo precursor. The improved performance was attributed to the increased electrochemical surface area that exposed more active sites. The high electrocatalytic efficiency of the active sites was also in line with the enhanced specific activity and turnover frequency values. In addition, high catalytic stability was also observed.

Keywords

• Phosphide
• Oxygen evolution reaction
• Selenization
• Water splitting reaction