Abstract
Non-precious metal catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are the cost-effective materials for overall water splitting. Here, we report that the core-shell structured Ni12P5/Ni3(PO4)2 hollow spheres (Ni12P5/Ni3(PO4)2-HS) exhibits high activity and stability towards both HER and OER in strong alkaline media. A current density of 10mAcm−2 is generated at an overpotential of 0.114V and 0.318V in 1M KOH for HER and OER, respectively. The high activity is attributed to the hollow core-shell (Ni12P5/Ni3(PO4)2) structure that the material adopts under catalytic conditions. The Ni12P5/Ni3(PO4)2-HS can serve as both cathode and anode catalysts for a real water electrolysis cell, which generates a current density of 357.6mAcm−2 at 1.8V and stable at 300mAcm−2 for at least 100h, the potential catalytic degradation mechanism has been systematically studied and discussed.
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