Unrevealing the Activity Promotion of the Hierarchical Yolk-Shell Structure Based on Co-Glycerate@Cobalt Carbonate Hydroxide by Dual Doping of the Manganese and Boron for Prompt Tri-functional ORR, OER, and HER

Abstract

Nowadays, exploring efficient electrocatalyst is crucial for tri-functional oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this study, we have designed a novel electrocatalyst based on Mn and B doped Co-glycerate@cobalt carbonate hydroxide for tri-functional OER, HER and ORR in alkaline conditions. Electrochemical measurements demonstrate the overpotentials of 318 and 75 mV at the current density of 10 mA cm-2 for OER and HER, respectively. Moreover, the two-electrode device based on the prepared electrocatalyst required a small cell voltages of 1.61 V and 1.86 V to achieve the current densities of 10 and 100 mA cm-2. Also, the prepared electrocatalyst possess the onset potential of 0.96 V and half-wave potential of 0.89 V as a robust electrocatalyst for ORR. The improved electrocatalytic performance of the prepared electrocatalyst can be related to the increasing of the electrical conductivity by heteroelement doping and synergistic effects.