title: ZIF-8 derived graphene-based nitrogen-doped porous carbon sheets as highly efficient and durable oxygen reduction electrocatalysts.
abstract: Nitrogen-doped carbon (NC) materials have been proposed as next-generation oxygen reduction reaction (ORR) catalysts to significantly improve scalability and reduce costs, but these alternatives usually exhibit low activity and/or gradual deactivation during use. Here, we develop new 2D sandwich-like zeolitic imidazolate framework (ZIF) derived graphene-based nitrogen-doped porous carbon sheets (GNPCSs) obtained by in situ growing ZIF on graphene oxide (GO). Compared to commercial Pt/C catalyst, the GNPCSs show comparable onset potential, higher current density, and especially an excellent tolerance to methanol and superior durability in the ORR. Those properties might be attributed to a synergistic effect between NC and graphene with regard to structure and composition. Furthermore, higher open-circuit voltage and power density are obtained in direct methanol fuel cells.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 (P. R. China) energy.ciac.jl.cn; University of Chinese Academy of Sciences, Beijing, 100049 (China).
authors.forename: Hai-xia
authors.initials: HX
authors.lastname: Zhong
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Yu-wei
authors.initials: YW
authors.lastname: Zhang
authors.forename: Wei-lin
authors.initials: WL
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.forename: Dan
authors.initials: D
authors.lastname: Xu
authors.forename: Yue-fei
authors.initials: YF
authors.lastname: Zhang
authors.forename: Xin-bo
authors.initials: XB
authors.lastname: Zhang
keywords: electrocatalysts; nitrogen doping; oxygen reduction reaction; porous carbon sheets