Abstract
Developing highly active, earth-abundant, and durable electrocatalysts is desired but challenging for oxygen evolution reaction (OER). In this work, we design an electrocatalyst of the edge-rich nickel sulfide arrays on the nickel foam (Ni3S2 NSs-NF) by a facile yet efficient wet-chemical method. Benefiting from the three-dimensional nanostructure with numerous active edges, the prepared Ni3S2 NSs-NF exhibits superior OER performance in alkaline conditions. An in-depth study reveals that the real active sites toward OER are the in situ formed heterogenous Ni3S2-NiOOH. Density functional theory (DFT) calculations indicate the density of state (DOS) of the Ni3S2-NiOOH heterojunction near the Fermi level is enhanced, contributing to higher electronic conductivity. As a result, the Ni3S2 NSs-NF with abundant Ni3S2-NiOOH heterojunctions exhibits an efficient electrochemical activity toward OER in alkaline conditions. The Ni3S2 NSs-NF electrode shows an overpotential of 244 mV at 10 mA cm−2 with a Tafel slope of 75 mV dec−1 and possesses ultrastable performance even at 100 mA cm−2.
Funder
National Natural Science Foundation of China
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
15 articles.
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