Engineering unique Fe(SexS1−x)2 nanorod bundles for boosting oxygen evolution reaction

Abstract

Fe-based electrocatalysts have attracted significant attention on account of the possibility for the realization of low-cost, high efficiency, and stable oxygen evolution reaction (OER) in alkaline solution. In this study, we present a new type of Fe(SexS1−x)2 nanorod bundles, which were successfully synthesized via a simple one-step hydrothermal method. We further demonstrate the applicability of these structures as electrocatalysts for OER application. We reveal that the incorporation of S into FeSe2 cause lattice strain and lattice defect, which is beneficial to expose more active sites and optimize the electronic structure, and hence the Fe(SexS1−x)2 composites display favorable catalytic for OER. More interestingly, the as-prepared Fe(Se0.5S0.5)2 catalyst exhibits the best OER performance with an overpotential at 10 mA·cm−2 of 247 mV, a low tafel slope of 54 mV/dec, and excellent catalytic stability. This work is expected to open a new door to discover other Fe-based materials as efficient catalysts for renewable energy.