Construction of CoNiFe Trimetallic Carbonate Hydroxide Hierarchical Hollow Microflowers with Oxygen Vacancies for Electrocatalytic Water Oxidation

• DOI: 10.1002/adfm.202200726
• Publication Date: 2022-06-01T12:29:02Z
• Authors: Yihao Liu; Guanyu Chen; Riyue Ge; Ke Pei; Chenxi Song; Wenxian Li; Yingying Chen; Yuan Zhang; Lingyan Feng; Renchao Che
• Keywords: Overpotential; Oxygen evolution

Abstract It is of great challenge to design transition multimetallic carbonate hydroxides with delicate hollow features and defects for efficient electrolytic oxygen evolution reaction (OER). Here, a sequential self‐templating method synthesize CoNiFe trimetallic hydroxide hierarchical microflowers (CN‐xFe HMs) vacancies (V O ) reported. The synergistic merits structure, Fe substitution, V endow the CN‐xFe HMs high active‐site exposure density increased electrical conductivity. Specially, optimized validate excellent OER performance an overpotential 258 mV drive 10 mA cm −2 Tafel slope 48.7 dec −1 . Theoretical calculations reveal that substitution can synergistically regulate electronic states achieve near‐ideal adsorption/desorption capacity oxygenated intermediates. Moreover, successful synthesis other six metals substituted CoNiM (M = Cu, Zn, Cr, Mo, Er La) provides universal protocol construct electrocatalysts structures gaining highly energy conversion reactions.