Design of an amorphous and defect-rich CoMoOF layer as a pH-universal catalyst for the hydrogen evolution reaction. Issue 13 (18th March 2021)

• Record Type: Journal Article
• Authors: Lei, Lei; Huang, Danlian; Chen, Yashi; Chen, Sha; Deng, Rui
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 13(2021)
• Page Start: 8730
• Page End: 8739
• Publication Date: 2021-03-18
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta00505g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Amorphous and defective CoMoO/GF was employed as a structure-induced template to induce the formation of CoMoOF/GF with more rich defects and a larger pore structure via proper anodic treatment. Abstract : Herein, a brief structural design strategy is proposed to fabricate amorphous CoMo bimetallic oxyfluoride on graphite felt (CoMoOF/GF) for efficient hydrogen evolution reaction (HER). Porous and defective CoMoO/GF is employed as a structure-induced template to induce the formation of CoMoOF/GF with more rich defects and a larger pore structure via proper anodic treatment. Theoretical calculations reveal a synergistic catalytic effect stemming from the CoMo bimetallic components, endowing CoMoOF/GF with more favorable HER performance. The amorphous construction endows the catalyst with remarkable mass transfer ability and sufficient exposed atoms, enhancing the electrochemically active surface area (ECSA). CoMoOF/GF with structural advantages and the synergistic effect of bimetallic components displays a considerably low overpotential of 79 mV at η 10 and a Tafel slope of 43.3 mV dec −1 for the HER in alkaline medium. Furthermore, excellent activity with an overpotential of 94 mV at η 10 and a Tafel slope of 60.2 mV dec −1 is observed in acidic medium as well. Besides, long-term stability is achieved within CoMoOF/GF when operating at −200 mV for 100 h.