title: Worm-Shape Pt Nanocrystals Grown on Nitrogen-Doped Low-Defect Graphene Sheets: Highly Efficient Electrocatalysts for Methanol Oxidation Reaction.
abstract: Although direct methanol fuel cell offers high energy use efficiency and low pollution emission, the lack of suitable electrode materials poses a great challenge to its commercial application. Herein, a facile and scalable approach is developed to fabricate a hybrid electrocatalyst consisting of strongly coupled worm-shape Pt nanocrystals and nitrogen-doped low-defect graphene (N-LDG) sheets. Interestingly, it is found that the formation of Pt nanoworms (NWs) is induced by the N atoms in the high-quality carbon matrix, which also allows the integration of their respective structural advantages and leads to a strong synergetic coupling effect. As a result, the obtained Pt NW/N-LDG catalyst exhibits an extremely high mass activity of 1283.1 mA mg-1toward methanol oxidation reaction, accompanied by reliable long-term stability and good antipoisoning ability, which are dramatically enhanced as compared with conventional Pt nanoparticle catalysts dispersed on undoped LDG, reduced graphene oxide, and commercial carbon black supports.
authors.affiliation: College of Mechanics and Materials, Hohai University, Nanjing, 210098, China.
authors.forename: Huajie
authors.initials: H
authors.lastname: Huang
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
authors.forename: Lulu
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
authors.forename: Chandra Sekhar
authors.initials: CS
authors.lastname: Tiwary
authors.affiliation: College of Mechanics and Materials, Hohai University, Nanjing, 210098, China.
authors.forename: Quanguo
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.|Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
authors.forename: Kuibo
authors.initials: K
authors.lastname: Yin
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
authors.forename: Wu
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
keywords: direct methanol fuel cell; electrocatalysts; low-defect graphene; nitrogen doping; platinum nanoworms