Abstract
Plasmonic materials integrated with electrochemical catalysts produce hot carriers that improve the catalytic activity of the hydrogen evolution reaction (HER). Previous studies have mainly focused on noble metal-based plasmonic materials. Herein, an efficient catalyst comprising non-noble TiN as the plasmonic booster and Pt nanoparticles (NPs) as the cocatalyst is prepared on carbon cloth (CC) (Pt/TiN/CC) by nitridation of TiO2 in NH3 and electrodeposition. The HER properties are improved significantly as manifested by a small overpotential of 16 mV at a current density of 10 mA cm−2 (η10) as well as 2-fold decay in η10 compared to the control experiment conducted in darkness (33 mV). To investigate the role of light-excited hot electrons in the reduction of protons to H2, Pt/TiOx/CC is irradiated with UV–visible light in the control experiment and the superior characteristics of Pt/TiN/CC corroborate the surface plasmon resonance (SPR) enhancement rendered from the TiN nanowire arrays. This study provides a fundamental understanding of hot electronics generated by SPR and insights into the design of non-noble electrocatalysts for HER and other applications.
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