NbOx overlayers protecting a NiMo alloy electrode realizing high-efficiency and durable intermittent water electrolysis

Abstract

The integration of electrocatalytic water splitting with renewable electricity is a promising approach for hydrogen production. However, the development of high-performance and earth-abundant catalysts of the hydrogen evolution reaction (HER) that can accommodate the fluctuation of renewable energy systems remains a challenge. NiMo electrodes are stable under continuous energy supply, but unfortunately, they decay rapidly when subjected to intermittent working conditions. To address this issue, we have deposited an NbO_x overlayer on the NiMo electrode, which effectively suppresses the leaching of Mo species and ultimately improves the HER stability. This research is a step towards transitioning NiMo electrodes from the laboratory to industrial applications and is expected to contribute to the advancement and utilization of hydrogen energy.