Effective Construction of the NiFe-P / Graphene Bifunctional Electrocatalyst for Overall Water Splitting

To gain bifunctional electrocatalyst with low cost and high catalytic activity for HER and OER, we used the principle of group coordination, and then the NiFe-P / RGO bifunctional catalyst was successfully prepared by a hydrothermal-phosphatizing pyrolysis method, in which graphite oxide was selected as the host carrier, nickel nitrate, potassium ferricyanide and trisodium citrate were acted as the raw materials. The chemical structure and morphological characterization of as-prepared catalysts were carried out by SEM, TEM, XRD, XPS and BET, respectively. Moreover, the alkaline hydrolysis performance of NiFe-P/ RGO electrocatalyst was tested. The results exhibited that the effective recombination between highly active NiFe-P and good conductive RGO can vastly accelerate ion/ electron charge transport to increase electrocatalytic performance. For HER and OER, NiFe-P/ RGO manifests excellent bifunctional activity with low overpotentials was 125 mV and 218 mV at a current density of 10 mA/ cm2, respectively. The electrolyzer equipped with the NiFe-P/ RGO as both cathode and anode requires only 1. 52 V at a current density of 10 mA/ cm2 with superior catalytic durability. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.