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摘要
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The rational strategy for synthesizing highly stable single-atom catalysts (SAC) remains very challenging. However, SAC aggregation and migration can be tackled through strong metal–support interaction (SMSI). Herein, we disclose the cobalt single-atom decoration over the MoP2/WP2 support (Co1–MoP2/WP2) utilizing a facile sonication followed by calcination strategy, confirmed by HAADF-STEM, XANES, and EXAFS. Subsequently, Co1–MoP2/WP2 loaded in nickel foam demands a low overpotential of 49 mV for the hydrogen evolution reaction (HER) and 250 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm–2. An alkaline water electrolyzer designed using the Co1–MoP2/WP2 catalyst as both the anode and cathode delivers a very low cell voltage of 1.49 V at 10 mA cm–2, surpassing the benchmark electrocatalyst with a stability of 48 h. Importantly, X-ray absorption spectroscopy discloses the local atomic and electronic charge transfer between Co SAC and the SMSI support, leading to a decrease in the overpotential and an increase in its catalytic efficiency. Furthermore, DFT is used to assess the change in the electronic characteristics caused by anchoring Co SAC on MoP2/WP2, resulting in improved electrocatalytic properties. Thus, this work provides a key insight into enhancing the overall water splitting performance by incorporating SAC into the MoP2/WP2 support. |
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