Cascading reconstruction to induce highly disordered Fe–Ni(O)OH toward enhanced oxygen evolution reaction. Issue 13 (4th March 2022)

• Record Type: Journal Article
• Authors: Hua, Wei; Sun, Huanhuan; Jiang, Mingwei; Ren, Lingbo; Zhang, Yu; Wang, Jian-Gan
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 13(2022)
• Page Start: 7366
• Page End: 7372
• Publication Date: 2022-03-04
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta00597b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : NiHCF nanocubes are in situ etched away and simultaneously induce the reconstruction of underneath Ni(OH)2 to form highly disordered Fe–Ni(O)OH. Abstract : Rational design of pre-catalysts is a powerful yet challenging strategy to realize high-efficient oxygen evolution reaction (OER) through electrochemical reconstruction. Herein, a well-designed pre-catalyst composed of nickel hexacyanoferrate (NiHCF) nanocubes on crystalline Ni(OH)2 nanosheets is demonstrated to achieve outstanding OER catalysts via cascading reconstruction. The NiHCF phase experiences a complete reconstruction and simultaneously functions as an inducing mediator to enable the reconstruction of the underneath Ni(OH)2 to form highly disordered Fe–Ni(O)OH. Benefiting from the cascading reconstruction process, the electrode shows obvious self-activation behavior with a notable overpotential decrease of 92 mV at 10 mA cm −2 relative to that of the pristine catalysts. Accordingly, the as-activated highly disordered Fe–Ni(O)OH exhibits excellent OER performance with an ultralow overpotential of 242 mV to drive the current density of 10 mA cm −2 and good stability at about 100 mA cm −2 over 100 h. The facile cascading reconstruction strategy offers a new perspective for obtaining superior catalysts toward OER.