Single platinum atoms implanted 2D lateral anion-intercalated metal hydroxides of Ni2(OH)2(NO3)2 as efficient catalyst for high-yield water splitting

In this study, we report new electrocatalysts based on 2D anion-intercalated metal hydroxides of Ni-2(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 (eta) of 24 mV at 10 mA cm(-2), while the 2D NiNH requires an. of only 280 mV to reach 50 mA cm(-2) for OER. The assembly of PtSA-1.73-2D NiHN-based cathode and 2D NiHN-based anode to fabricate a twoelectrode electrolyzer of PtSA-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(+)//Pt/C(-). The device also exhibits prospective long-term stability in 1 M KOH. The achievements suggest that the PtSA-1.73-NiHN and 2D NiHN catalysts are two potential candidates for water splitting application.

Automated summary

In this study, new electrocatalysts based on 2D anion-intercalated metal hydroxides of Ni-2(OH)(2)(NO3)(2) (2D NiHN) and its derivation caused by the implantation of single platinum atoms (Pt-SA-2D NiHN) are reported. The Pt-SA 1.73-2D NiHN material shows promising HER activities with low Pt loading, while the 2D NiNH requires a higher overpotential for OER. The PtSA-1.73-NiHN and 2D NiHN catalysts are potential candidates for water splitting application.