Interlayer-bonded Ni/MoO<sub>2</sub> electrocatalyst for efficient hydrogen evolution reaction with stability over 6000 h at 1000 mA cm<sup>-2</sup>.
basic_science · Level V
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- Record sourced from PubMed, PMID 40436858.
- Also identified by DOI 10.1038/s41467-025-59933-6 and PMC identifier 12119828.
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Abstract
The mechanical stability of the catalytic electrodes used for hydrogen evolution reactions (HER) is crucial for their industrial applications in anion exchange membrane water electrolysis (AEM-WE). This study develops a corrosion strategy to construct a self-supported electrocatalyst (Int-Ni/MoO<sub>2</sub>) with high mechanical stability by anchoring the Ni/MoO<sub>2</sub> catalytic layer with a dense interlayer of MoO<sub>2</sub> nanoparticles. The Int-Ni/MoO<sub>2</sub> exhibits a strengthened homostructural interface between the interlayer and catalytic layer, preventing the detachment of the catalyst during ultrasonic treatment. The blade-shaped catalytic layer reduces bubble shock and potential fluctuations at high current densities up to -6000 mA cm<sup>-2</sup>. As a result, the Int-Ni/MoO<sub>2</sub> electrode exhibits a low overpotential of 73.2 ± 14.2 mV and long-term stability for 6000 h at -1000 mA cm<sup>-2</sup> in a 1 M KOH solution. The Int-Ni/MoO<sub>2</sub> assembled AEM-WE device demonstrates long-term stability at 1000 mA cm<sup>-2</sup> for 1000 h with a very low degradation rate of 3.96 µV h<sup>-1</sup>.