In situ selenylation of molybdate ion intercalated Co-Al layered double hydrotalcite for high-performance electrocatalytic oxygen evolution reaction

For many advanced energy technologies, it is essential to produce non-precious metals, high activity, and low charge transfer resistance electrocatalysts through low cost and simple methods. In this work, MoSe2- CoSe2@CoAl-LDH composite was synthesized by a one-step hydrothermal method. Compare with the CoAlLDH catalyst, the prepared MoSe2-CoSe2@CoAl-LDH composite exhibits an excellent OER performance with a low overpotential (320 mV at 10 mA.cm(-2)), a small Tafel slope (71 mV.dec(-1)). The prominent OER performance of the MoSe2-CoSe2@CoAl-LDH composite can be mainly attributed to the fast electron transfer from the CoAl-LDH to MoSe2-CoSe2 and the catalytic activity promoted by the energy change of Co2+ due to the introduction of Se, which can be confirmed by EIS and XPS results, respectively. The strategy of this work may provide a low-cost and facile way for large-scale synthesis of non-precious metal modified hydrotalcite composite. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Automated summary

In this study, a MoSe2-CoSe2@CoAl-LDH composite was successfully synthesized via a hydrothermal method, exhibiting excellent performance in the oxygen evolution reaction. The outstanding performance of this composite can be attributed to the fast electron transfer between CoAl-LDH and MoSe2-CoSe2, as well as the catalytic activity promoted by the introduction of Se.