Abstract
Developing efficient and durable electrocatalysts for faster anodic oxygen evolution reaction (OER) in water electrolysis is significant to hydrogen production. In this study, an electrocatalyst NiCo@Ni3S2/NF for OER was prepared using a two-step method. Ni3S2 nanoarray was initially grown on a nickel foam (NF) substrate, followed by the deposition of an ultrathin NiCo layered double hydroxides (LDH) film that wrapped around the surface of Ni3S2/NF to form a hill-shaped morphology. Characterization results of SEM, TEM, and XPS confirmed the presence of a heterogeneous interface with an enlarged contact area between NiCo LDH and Ni3S2 in this unique structure. This leads to more active species such as Ni3+ and Co3+, resulting in enhanced intrinsic catalytic activity. This hill-shaped topography also demonstrated to be conducive to the release of oxygen bubbles generated during OER process. The prepared electrocatalyst NiCo@Ni3S2/NF exhibits a rapid charge transfer rate and a Tafel slope as low as 63 mV·dec−1. It therefore demonstrates excellent OER performance with a low overpotential of 245 mV at current density of 10 mA cm−2, and long-term stability under both currents of 10 and 50 mA cm−2.
Published Version
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