title: High-Performance Energy Storage and Conversion Materials Derived from a Single Metal-Organic Framework/Graphene Aerogel Composite.
abstract: Metal oxides and carbon-based materials are the most promising electrode materials for a wide range of low-cost and highly efficient energy storage and conversion devices. Creating unique nanostructures of metal oxides and carbon materials is imperative to the development of a new generation of electrodes with high energy and power density. Here we report our findings in the development of a novel graphene aerogel assisted method for preparation of metal oxide nanoparticles (NPs) derived from bulk MOFs (Co-based MOF, Co(mIM)2(mIM = 2-methylimidazole). The presence of cobalt oxide (CoOx) hollow NPs with a uniform size of 35 nm monodispersed in N-doped graphene aerogels (NG-A) was confirmed by microscopic analyses. The evolved structure (denoted as CoOx/NG-A) served as a robust Pt-free electrocatalyst with excellent activity for the oxygen reduction reaction (ORR) in an alkaline electrolyte solution. In addition, when Co was removed, the resulting nitrogen-rich porous carbon-graphene composite electrode (denoted as C/NG-A) displayed exceptional capacitance and rate capability in a supercapacitor. Further, this method is readily applicable to creation of functional metal oxide hollow nanoparticles on the surface of other carbon materials such as graphene and carbon nanotubes, providing a good opportunity to tune their physical or chemical activities.
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xia
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.|School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Chong
authors.initials: C
authors.lastname: Qu
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Zibin
authors.initials: Z
authors.lastname: Liang
authors.affiliation: School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Bote
authors.identifier: 0000-0003-1236-6862
authors.initials: B
authors.lastname: Zhao
authors.affiliation: School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Shuge
authors.initials: S
authors.lastname: Dai
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Qiu
authors.affiliation: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 331 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Jiao
authors.affiliation: School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Qiaobao
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Huang
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Wenhan
authors.initials: W
authors.lastname: Guo
authors.affiliation: School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Dai
authors.initials: D
authors.lastname: Dang
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Ruqiang
authors.identifier: 0000-0003-0456-4615
authors.initials: R
authors.lastname: Zou
authors.affiliation: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Dingguo
authors.identifier: 0000-0003-2191-236X
authors.initials: D
authors.lastname: Xia
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST) , Ikeda, Osaka 563-8577, Japan.
authors.forename: Qiang
authors.identifier: 0000-0001-5385-9650
authors.initials: Q
authors.lastname: Xu
authors.affiliation: School of Materials Science and Engineering, Georgia Institute of Technology , 771 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Meilin
authors.identifier: 0000-0002-6188-2372
authors.initials: M
authors.lastname: Liu
keywords: Metal−organic framework; N-doped graphene aerogel; ORR catalyst; supercapacitor