Surface-Regulated Rhodium-Antimony Nanorods for Nitrogen Fixation.

ABSTRACT

Surface regulation is an effective strategy to improve the performance of catalysts, but it has been rarely demonstrated for nitrogen reduction reaction (NRR) to date. Now, surface-rough Rh2 Sb nanorod (RNR) and surface-smooth Rh2 Sb NR (SNR) were selectively created, and their performance for NRR was investigated. The high-index-facet bounded Rh2 Sb RNRs/C exhibit a high NH3 yield rate of 228.85±12.96 µg h-1 mg-1 Rh at -0.45 V versus reversible hydrogen electrode (RHE), outperforming the Rh2 Sb SNRs/C (63.07±4.45 µg h-1 mg-1 Rh ) and Rh nanoparticles/C (22.82±1.49 µg h-1 mg-1 Rh ), owing to the enhanced adsorption and activation of N2 on high-index facets. Rh2 Sb RNRs/C also show durable stability with negligible activity decay after 10 h of successive electrolysis. The present work demonstrates that surface regulation plays an important role in promoting NRR activity and provides a new strategy for creating efficient NRR electrocatalysts.