Abstract
In this study, we report new electrocatalysts based on 2D anion-intercalated metal hydroxides of Ni(OH)2(NO3)2 (2D NiHN) and its derivation caused by the implantation of single platinum atoms (Pt_(SA)_2D NiHN). The optimum Pt_(SA-1.73)-2D NiHN material having low Pt loading of 1.73 wt% exhibits prospective HER activities with an overpotential (r|) of 24 mV at 10 mA cm~(-2), while the 2D NiNH requires an n of only 280 mV to reach 50 mA cm~(-2) for OER. The assembly of Pt_(SA-1.73)-2D NiHN-based cathode and 2D NiHN-based anode to fabricate a two-electrode electrolyzer of Pt_(SA-1.73)-2D NiHN_(-)//2D NiHN_(+) allows a cell voltage of only 1.45 V at 10 mA cm~(-2) for overall water splitting, superior to RuO2_(2(+))//Pt/C_(-). The device also exhibits prospective long-term stability in 1M KOH. The achievements suggest that the Pt_(SA-1.73)-NiHN and 2D NiHN catalysts are two potential candidates for water splitting application.
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