Construction of porous core-shell MnCo2S4 microrugby balls for efficient oxygen evolution reaction

It is critical to rationally design highly efficient, stable, and cost-effective electrocatalysts for oxygen evolution reaction (OER). Herein, the porous core-shell MnCo2S4 microrugby balls are successfully synthesized via a two-step solvothermal method. Benefiting from the desired porous structure, strong electronic interaction and large specific surface area, it shows a small overpotential of 317 mV at a current density of 10 mA cm(-2), a low Tafel slope of 73.7 mV dec(-1) and robust stability, which is better than that of the corresponding metal oxides and commercial IrO2. The significantly enhanced OER performance of MnCo2S4 microrugby balls can be attributed to their high electrochemical active surface area and electrical conductivity. This work provides a new perspective to design and synthesize core-shell structured electrocatalysts. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The porous core-shell MnCo2S4 microrugby balls show excellent OER performance with small overpotential, low Tafel slope, and good stability, outperforming metal oxides and commercial IrO2. This is attributed to their high electrochemical active surface area and electrical conductivity, providing a new perspective for designing and synthesizing core-shell structured electrocatalysts.