The enhancing selectivity and activity for 2-electron oxygen reduction reaction by tuned oxygen defect on amorphous hydroxide catalysts

Abstract

Open AccessCCS Chemistry26 Feb 2021The enhancing selectivity and activity for 2-electron oxygen reduction reaction by tuned oxygen defect on amorphous hydroxide catalysts Junheng Huang, Changle Fu, Junxiang Chen, Nangan Senthilkumar, Xinxin Peng and Zhenhai Wen Junheng Huang Google Scholar More articles by this author , Changle Fu Google Scholar More articles by this author , Junxiang Chen Google Scholar More articles by this author , Nangan Senthilkumar Google Scholar More articles by this author , Xinxin Peng Google Scholar More articles by this author and Zhenhai Wen Google Scholar More articles by this author https://doi.org/10.31635/ccschem.021.202100750 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesTrack Citations ShareFacebookTwitterLinked InEmail Amorphous catalysts, thanks to their unique coordinately unsaturated properties and abundant of defect sites, incline to possess higher activity and selectivity than their crystalline counterparts. In this work, we report a facile and general solvent-controlled-precipitation method to prepare hybrids of graphene oxide (GO) supporting amorphous metal hydroxide (A-M(OH)x/GO, M = Cu, Co, Mn), which provides us with tangible materials to study the structure-performance relationship of various amorphous oxides. The systematic investigations on A-Cu(OH)2/GO by coupling ex-situ/in-situ characteristic techniques with electrochemical studies reveal that electrocatalytic activity and selectivity toward 2 electron oxygen reduction reaction (ORR) is highly dependent on the coordinated Cu catalytic sites and the disorder structure of A-Cu(OH)2. In-situ X-ray absorption near edge structure (XANES) and density functional theory (DFT) calculation verify that the degree of OH* poisoning (ΔG0OH*) tuned by 3-OHcoordinated Cu sites in amorphous structures play a crucial role in selective catalysis of ORR for H2O2 production. The optimized A-Cu(OH)2/GO shows superior activity and high selectivity (∼95%) toward H2O2, as demonstrated by a Zinc-air battery that is capable of on-site producing H2O2 with a production rate of as high as 3401.5 mmol h−1 g−1. Download figure Download PowerPoint Previous article FiguresReferencesRelatedDetails Issue AssignmentNot Yet AssignedSupporting Information Copyright & Permissions© 2021 Chinese Chemical Society Downloaded 103 times Loading ...