title: Co@Co3 O4 @PPD Core@bishell Nanoparticle-Based Composite as an Efficient Electrocatalyst for Oxygen Reduction Reaction.
abstract: Durable electrocatalysts with high catalytic activity toward oxygen reduction reaction (ORR) are crucial to high-performance primary zinc-air batteries (ZnABs) and direct methanol fuel cells (DMFCs). An efficient composite electrocatalyst, Co@Co3 O4 core@shell nanoparticles (NPs) embedded in pyrolyzed polydopamine (PPD) is reported, i.e., in Co@Co3 O4 @PPD core@bishell structure, obtained via a three-step sequential process involving hydrothermal synthesis, high temperature calcination under nitrogen atmosphere, and gentle heating in air. With Co@Co3 O4 NPs encapsulated by ultrathin highly graphitized N-doped carbon, the catalyst exhibits excellent stability in aqueous alkaline solution over extended period and good tolerance to methanol crossover effect. The integration of N-doped graphitic carbon outer shell and ultrathin nanocrystalline Co3 O4 inner shell enable high ORR activity of the core@bishell NPs, as evidenced by ZnABs using catalyst of Co@Co3 O4 @PPD in air-cathode which delivers a stable voltage profile over 40 h at a discharge current density of as high as 20 mA cm(-2) .
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Zhijuan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Ge
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: F W Thomas
authors.initials: FW
authors.lastname: Goh
authors.affiliation: Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
authors.forename: Xiao
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Guojun
authors.initials: G
authors.lastname: Du
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Delvin
authors.initials: D
authors.lastname: Wuu
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Zhaolin
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.|Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.
authors.forename: T S
authors.initials: TS
authors.lastname: Andy Hor
authors.affiliation: Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zong
keywords: cobalt oxide; dopamine; nitrogen-doped carbon; oxygen reduction reaction; zinc-air batteries