Abstract
Efficient oxygen evolution reaction (OER) catalysts require the reasonable integration of geometric architecture, defects construction and interfacial electronic structure, which is difficult to combine multiple advantages into one low-cost catalysts. Herein, we designed a novel low Ru doping 2D square CoNiRuOx nanosieves (NSs) with abundant surface micropore and mesopore structure, rich oxygen defects and heterophase interfaces. Owing to the Ru incorporation, the electrons in Ni2+ could partially spontaneously transfer to the Ru4+ species by the bridge O2− with π donation effect according to the proposed “Ni-O-Co-O-Ru-O-Ni” electron interaction model. Benefitting from the porous surface with rich mass transfer channel, increased oxygen defects concentration, well-optimized electron redistribution, the CoNiRuOx nanosieves possessed a low overpotential of 261 mV to reach the current density of 10 mA cm−2, which is better than that of counterpart CoNiOx NSs and commercial RuO2 catalysts. The CoNiRuOx NSs also possessed the favorable durability with 50 h. Moreover, the CoNiRuOx//Pt/C electrode couple exhibited enhanced overall water splitting performance. This work provides offers insightful significance to design 2D micro-mesoporous materials for the robust electrocatalysis processes related to energy conversion technologies.
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