ScholarWorks@성균관대학교

초록

In this work, highly durable hydrogen evolution reaction (HER) catalyst composed of amorphous NiP nano thin film synthesized on a Ni foam via electrochemical deposition process is demonstrated. Electrochemical deposition was tuned by controlling the scan rates in the cyclic voltammetry (CV), where resultant NiP nano thin film thicknesses & coverages were greatly influenced, thereby having a profound impact on the HER activities. By systematically optimizing deposition parameters, including CV scan rate and electrolyte temperature, we develop an amorphous NiP nano thin film based electrocatalyst with high HER activity. (NiP-0.05-RT) Optimized NiP based electrocatalyst exhibited a uniform surface coverage of Ni foam support, with approximate thickness of 909 nm and demonstrated a low overpotential of 102 mV at 10 mA/cm² under the 1 M KOH solution, along with a Tafel slope of 50.7 mV/dec. This study further explored the effects of substrate pretreatment and thermal conditions on morphological changes and HER catalytic activity. Finally, the amorphous NiP nano thin film demonstrated excellent long-term stability with negligible potential drift over 100 h at 10 mA/cm², outperforming existing Ni-based alloys.

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