Well‐Monodispersed Iron‐Doped InOOH Nanoparticles with Enhanced Activity for Oxygen Evolution. Issue 19 (9th September 2020)

• Record Type: Journal Article
• Authors: Yang, Liping; Han, Jianxin; Zhang, Jifu; Li, Yanxin; Wang, Wei; Cao, Lixin; Dong, Bohua
• Is Part Of: ChemElectroChem. Volume 7:Issue 19(2020)
• Page Start: 3991
• Page End: 3997
• Publication Date: 2020-09-09
• Subjects: monodispersed nanoparticles -- InOOH -- Fe doping -- oxygen evolution reaction -- transition metal hydroxides; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000919
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Designing efficient and stable catalysts with smaller‐sized nanostructures holds promise in alkaline water electrolysis, especially for the oxygen evolution reaction (OER), whereas selecting proper candidates and facile synthetic strategies remain challenging. Herein, well‐monodispersed InOOH nanoparticles (NPs) tailored by Fe doping with diameters of about 7 nm are synthesized by using a two‐phase colloidal method and secondary solvothermal process. Benefiting from the large electrochemically active surface area given by the unique monodispersed NP morphology, the increased active sites generated by tunable Fe doping that can increase the OER activity of the host oxide, and the synergistic effect between In and Fe, Fe‐doped InOOH NPs exhibits superior electrocatalytic activity toward the OER. As a result, well‐monodispersed Fe‐doped InOOH NPs could achieve current densities of 10 and 100 mA cm −2 at overpotentials of 220 mV and 266 mV, respectively, in alkaline media (1.0 M KOH), and possess an excellent catalytic durability of 27 hours, transcending most of the previously reported Fe‐rich OER electrocatalysts. Abstract : Keeping an iron the situation : Well‐monodispersed Fe‐doped InOOH nanoparticles (NPs) with diameters of about 7 nm are successfully synthesized and investigated as catalysts for the oxygen evolution reaction (OER). The optimized Fe‐InOOH sample exhibits excellent activity toward the OER in an alkaline medium with outstanding durable stability. The unique monodispersed NP morphology provides larger catalytically active areas as well as selectivity. The strategy of Fe doping not only improves the inherently low activity of InOOH but also generates a synergistic effect between In and Fe, which can improve the conductivity of Fe‐InOOH NPs.