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This study investigates an ethanol-mediated electrochemical surface reconstruction strategy to enhance the oxygen evolution reaction (OER) activity of nickel-based catalysts, specifically promoting the transformation of Ni(OH)2 into γ-NiOOH. The reconstructed Ni(OH)2 catalyst demonstrated a significant reduction in overpotential (155 mV) compared to untreated samples, achieving 270 mV at 100 mA cm-2. The strategy was also applied to Mo-doped Ni(OH)2 and commercial nickel mesh (NiAl-NM), with the catalyst activity being regenerated through electrolyte replacement and short-term reconstruction.
Ethanol-mediated electrochemical reconstruction significantly enhances the oxygen evolution reaction activity of nickel-based catalysts, offering a promising avenue for improving green hydrogen production.
Developing efficient and durable oxygen evolution reaction (OER) catalysts is of great significance for achieving industrial-scale production of green hydrogen. This study proposes an innovative ethanol-mediated electrochemical surface reconstruction strategy to significantly enhance the OER activity of nickel-based catalysts. This strategy effectively promotes the transformation of Ni(OH)2 into the highly active γ-NiOOH phase, which greatly increases the density of surface Ni3+ active sites and optimizes the catalyst's microstructure and electronic properties. After electrochemical reconstruction, the Ni(OH)2-R exhibits outstanding catalytic activity, requiring an overpotential of only 270 mV at 100 mA cm-2. This represents a substantial reduction of 155 mV compared to the untreated sample. This strategy is also successfully applied to Mo-doped Ni(OH)2 and commercial nickel mesh (NiAl-NM). Furthermore, the catalyst activity can be regenerated through simple electrolyte replacement and short-term reconstruction treatment after long-term operation, thereby extending catalyst's service life. This work presents promising prospects for industrial applications due to its simple process, low cost, and capability for in situ activity regeneration, which holds significant implications for advancing water electrolysis hydrogen production technology.
