Abstract
Optimizing the efficiencies of both electron transport and chloridion repulsion are highly desired for achieving high-performance oxygen evolution reaction (OER) electrocatalysts in seawater oxidation, but still remains a huge challenge. In this study, an efficient synthetic method is developed to successfully synthesize a novel heterogeneous hollow polyhedron nanocages (denoted as NiCo2O4/NiCoP) with directional electron transport and strong chloridion repulsion properties, which profits from its diverse work functions and anion electrostatic repulsion in heterojunction nanostructure, respectively. Accordingly, NiCo2O4/NiCoP exhibits superior OER activity in 1 M KOH (η = 325 mV@10 mA cm−2) and alkaline simulated seawater (η = 340 mV@10 mA cm−2), as well as outstanding long-term stability. Density functional theory calculations demonstrate that the construction of NiCo2O4/NiCoP heterojunction promotes the directional electron transport in the heterogeneous interface and enables strong chloridion repulsion in comparison with individual NiCo2O4 and NiCoP, thus largely improving its OER performance in alkaline simulated seawater.
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