Abstract
Herein, a hybrid nanowire-nanosheet structure made of the cerium oxide and nickel-cobalt phosphide (CeO2-NiCoP_x) compound is in situ engineered on the Ni-Co foam (CeO2-NiCoP_x/NCF) for the robust water splitting (HER and OER), and the overpotentials of synthesized CeO2-NiCoP_x/NCF are about 39 mV for HER and 260 mV for OER at a current density of 10 mA cm~(-2) (j_(10)). Meanwhile, the nanostructure of Ceo2-NiCoP_x is well preserved after a long-term electrocatalytic process (100 h) at a large current density of 100 mA cm~(-2) (j_(100)). When the CeO2-NiCoP_x/NCF simultaneously acts as the HER and OER electrodes, the potential of 1.49 V is obtained for transferring j_(10) with an excellent durability. Theoretical simulations and in operando Raman spectroscopy reveal that the Co and Ni atoms for CeO2-NiCoP_x/NCF catalyst are likely to act as the pivotal reaction centers for HER and OER processes, respectively.
NSTL