Abstract
The rational design of efficient electrodes that can withstand high current densities is urgent for electrolytic hydrogen generation, but it is a significant challenge to develop high activity and stability electrocatalysts with simple methods. Herein, we report an electrocatalyst that is obtained by in situ rapid depth self-reconstruction of Fe-doped hydrate NiMoO4 (denoted as NiFeMoO). Experimental and theoretical calculations show that the co-leaching of crystal water and MoO42− from the original structure induces the structure crack and electrolyte penetration, as well as synergistic Fe incorporation, leading to the generation of active catalyst phase of Fe doped γ-NiOOH (denoted as SR-NiFeMoO) during electro-oxidation. In 1 M KOH, the resulting SR-NiFeMoO, with unique poly-/low-crystalline features, possesses ultralow overpotential of 168 mV at 10 mA cm−2 and 226 mV at 100 mA cm−2, and performs stable catalysis for over 106 h at a high current density of 1000 mA cm−2. In addition, the presence of dissolved Mo leads to the change of electrolyte properties over time, which leads to the continuous reduction of potential for water oxidation. The discovery of deep self-reconstruction may provide a new methodology for the development of robust and efficient electrocatalysts for electrolytic hydrogen generation.
Published Version
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