An anion exchange reaction: an effective approach to prepare alloyed Co–Fe bimetallic disulfide for improving the electrocatalytic activity

Abstract

A mild anion exchange approach is proposed for the synthesis of alloyed Co–Fe bimetallic disulfide. Abundant structural disorders and tunable compositions are effectively induced by the anion exchange process. The alloyed Co–Fe bimetallic disulfide exhibits a low overpotential of 205 mV to reach a current density of 100 mA cm⁻² in an acidic electrolyte, which is significantly improved compared to the performance of individual disulfide. It is believed that this work paves a new strategy for the synthesis of bimetallic compounds and highlights the importance of tuning the catalyst composition for achieving high catalytic performance.