Heterogeneous Ni-Fe-P integrated with nickel foam as an efficient and durable electrocatalyst for water oxidation. (3rd May 2019)

• Record Type: Journal Article
• Authors: Zhang, Jianshuo; Hou, Kun; Yao, Qianqian; Wu, Chuxin; Huang, Meihua; Guan, Lunhui
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 23(2019)
• Page Start: 11684
• Page End: 11694
• Publication Date: 2019-05-03
• Subjects: Water oxidation -- Oxygen evolution reaction (OER) -- Hydrogen evolution reaction (HER) -- Heterogeneous metal phosphides -- Overall water splitting; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.03.151
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Transition metal phosphides represent a class of promising electrocatalysts for electrochemical water oxidization and other energy conversion reactions. In this work, we report a novel seal strategy, followed by a second step phosphorization treatment, produces Ni-Fe-P heterostructure directly grown on nickel foam that shows highly catalytic activity for electrochemical water oxidation. The as-prepared catalyst exhibits an excellent electrocatalytic activity, manifested by a current density of 20 mA cm −2 with a very low overpotential (260 mV) for oxygen evolution reaction along with an extremely small Tafel slope of 27 mV decade −1 and a very excellent durability of 120 h in alkaline solution. The excellent performance with exceptional durability owe much to the synergistic effect between the Ni-Fe-P heterostructure and the outer oxidized layer. Remarkably, a current density of 10 mA cm −2 was reached at a low cell voltage of 1.63 V when the original electrode and surface oxidized electrode are used as cathode and anode, respectively. Graphical abstract: Image 1 Highlights: NiFeP heterostructure is prepared for electrochemical water splitting. Seal strategy is used for the preparation of NiFeO precursor. The catalyst runs continuously for at least 120 h under OER operation. The electrolytic cell only needs 1.63 V to reach a current density of 10 mA cm −2 .