NiFe layered double hydroxide nanosheet array for high-efficiency electrocatalytic reduction of nitric oxide to ammonia

Abstract

A NiFe layered double hydroxide nanosheet array is designed as an efficient NORR catalyst for NH ₃ electrosynthesis with a maximal FE of 82% and the highest yield rate of 1586.7 μg h ⁻¹ mg _cat. ⁻¹, exceeding most recently reported results.

Abstract

Here, we demonstrate that under ambient conditions, a nickel-iron layered double hydroxide nanosheet array can exhibit a promising NORR performance, delivering a maximal faradaic efficiency of 82% and a corresponding yield rate of 112 μmol h ⁻¹ cm ⁻², along with high stability for over 30 h. This superior performance is further confirmed as a proof-of-concept for a Zn–NO battery, in which a peak power density of 1.8 mW cm ⁻² and a large NH ₃ yield rate of 32 μmol h ⁻¹ cm ⁻² are observed. Theoretical analyses indicate that NiFe-LDH exhibits effective NO activation capacity and slow hydrogen evolution kinetics.