MOF-derived M-OOH with rich oxygen defects by in situ electro-oxidation reconstitution for a highly efficient oxygen evolution reaction. Issue 18 (30th April 2021)

• Record Type: Journal Article
• Authors: Shi, Zhikai; Yu, Zebin; Jiang, Ronghua; Huang, Jun; Hou, Yanping; Chen, Jianhua; Zhang, Yongqing; Zhu, Hongxiang; Wang, Bing; Pang, Han
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 18(2021)
• Page Start: 11415
• Page End: 11426
• Publication Date: 2021-04-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta01638e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Metal-oxyhydroxides with rich oxygen defects (M-OOHv) derived from MOFs were prepared through an efficient, simple, and green in situ electro-oxidation reconstitution strategy for a highly efficient oxygen evolution reaction. Abstract : The oxygen evolution reaction (OER) is an important half-reaction in the field of energy production. However, effective, simple, and green preparation of low-cost OER electrocatalysts remains a problem. Herein, a novel in situ electro-oxidation reconstitution strategy is first adopted to derive metal-oxyhydroxides with rich oxygen-defects (M-OOHv) on the surface of Fe2 Co-MOF with nickel foam (NF) as the substrate, named Fe2 Co-MOF@M-OOHv-ER/NF, which exhibits an extremely low overpotential of 224 mV at a current density of 10 mA cm −2 in 1 M KOH for the OER, with a small Tafel slope of 44.87 mV dec −1 and a high electrochemically active surface area of 50.5 cm 2 . The in situ Raman reveals the transition of the MOF phase to the M-OOHv phase, which is the real active site for the OER. Furthermore, X-ray photoelectron spectroscopy, photoluminescence, and density functional theory calculations prove that the bimetal synergistic effect and the oxygen defects in the M-OOHv, regulating the electron density of states, are the real reasons for the higher catalytic activity for the OER. In short, the newly prepared Fe2 Co-MOF@M-OOHv-ER/NF not only can be prepared by an efficient, simple, and green strategy, but also has excellent oxygen evolution performance.