High-efficiency oxygen evolution catalyzed by Sn–Co–Ni phosphide with oriented crystal phases. Issue 25 (14th June 2022)

• Record Type: Journal Article
• Authors: Liu, Xin; Huang, Jun; Li, Tongtong; Chen, Wei; Chen, Guangliang; Han, Liting; Ostrikov, Kostya (Ken)
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 25(2022)
• Page Start: 13448
• Page End: 13455
• Publication Date: 2022-06-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta03181g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The resulting SnPi@CoP–Ni5 P4 /NCF shows an excellent electrocatalytic performance of OER, which is indicated by a low overpotential of 364 mV for transferring j 600 and a low activity decay (2.1%) for the pushed j 100 for 50 h. Abstract : Oxygen evolution reaction (OER) is the main limiting step of overall water splitting, and it is crucial to develop high-performance electrocatalysts for increasing the OER efficiency. Herein, a tin layer is coated on the nickel–cobalt foam surface with an electrodeposition technique and the multiple-phases of tri-metal Sn–Co–Ni phosphide (SnPi@CoP–Ni5 P4 /NCF) are simultaneously formed with a simple phosphating step. The synthesized SnPi@CoP–Ni5 P4 /NCF exhibits an excellent electrocatalytic performance for OER, which can transfer the current densities of 10 and 600 mA cm −2 ( j 10 and j 600 ) in 1.0 M KOH with low overpotentials of 180 and 364 mV, respectively. The ultra-stable OER process is characterized by a low decay (2.1%) over 50 h I – t test with j 100 . The quantum chemistry simulations reveal the synergistic effects of the tri-metal phosphide, while the oriented crystal phases of SnPi@CoP–Ni5 P4 enable the electron redistribution for lowering H2 O adsorption energy and decreasing the energy barrier for dissociation. The in situ Raman results suggest that the formed NiOOH and CoOOH act as the active intermediates for OER in the alkaline medium.