title: Precious-metal-free Co-Fe-O/rGO synergetic electrocatalysts for oxygen evolution reaction by a facile hydrothermal route.
abstract: Abundant iron group metal oxides and their composites possess great potential in the application of electrochemical energy storage and conversion. In this work, we obtained Co-Fe-O composites/reduced graphene oxides (CFO/rGO) hybrid structures, engineered their compositions, phase, and structures by a facile hydrothermal route, and studied their composition-dependent activity for electrochemical oxygen evolution reaction (OER) in alkaline media. It is found that synergetic effects bring a clear decrease in overpotential and Tafel slope for CFO/rGO catalysts in comparison with monometallic composition/rGO catalysts. OER charge-transfer resistance is significantly reduced after Fe addition, indicating that the reaction barriers of CFO/rGO are reduced. The optimal CFO/rGO with Co-Fe ratio of 2:1 was identified. Our results on the synergetic effects of CFO/rGO enrich the understanding of iron-group composites for electrocatalytic applications.
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University. The Key Laboratory of Fuctional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano Science and Technology, Anhui Normal University, No.1 Beijing East Road, Wuhu, 241000 (P.R. China).
authors.forename: Jing
authors.initials: J
authors.lastname: Geng
authors.forename: Long
authors.initials: L
authors.lastname: Kuai
authors.forename: Erjie
authors.initials: E
authors.lastname: Kan
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Baoyou
authors.initials: B
authors.lastname: Geng
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004563:Electrochemistry; D006108:Graphite / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
chemical_list: D010087:Oxides; D003035:Cobalt; D006108:Graphite; D007501:Iron; D010100:Oxygen
keywords: composites; electrocatalysis; oxygen evolution reaction; spinel; synergetic effect