title: Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction.
abstract: Improving the platinum (Pt) mass activity for the oxygen reduction reaction (ORR) requires optimization of both the specific activity and the electrochemically active surface area (ECSA). We found that solution-synthesized Pt/NiO core/shell nanowires can be converted into PtNi alloy nanowires through a thermal annealing process and then transformed into jagged Pt nanowires via electrochemical dealloying. The jagged nanowires exhibit an ECSA of 118 square meters per gram of Pt and a specific activity of 11.5 milliamperes per square centimeter for ORR (at 0.9 volts versus reversible hydrogen electrode), yielding a mass activity of 13.6 amperes per milligram of Pt, nearly double previously reported best values. Reactive molecular dynamics simulations suggest that highly stressed, undercoordinated rhombus-rich surface configurations of the jagged nanowires enhance ORR activity versus more relaxed surfaces.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
authors.forename: Mufan
authors.initials: M
authors.lastname: Li
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
authors.forename: Zipeng
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: Tao
authors.initials: T
authors.lastname: Cheng
authors.affiliation: Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.|CNR-ICCOM, Consiglio Nazionale delle Ricerche, 56124 Pisa, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Fortunelli
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
authors.forename: Chih-Yen
authors.initials: CY
authors.lastname: Chen
authors.affiliation: National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
authors.forename: Rong
authors.initials: R
authors.lastname: Yu
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: Boris V
authors.initials: BV
authors.lastname: Merinov
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
authors.forename: Enbo
authors.initials: E
authors.lastname: Zhu
authors.affiliation: Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.|Department of Chemical Engineering, California State University, Long Beach, CA 90840, USA.
authors.forename: Ted
authors.initials: T
authors.lastname: Yu
authors.affiliation: Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA.
authors.forename: Qingying
authors.initials: Q
authors.lastname: Jia
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Guo
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA. wag@wag.caltech.edu yhuang@seas.ucla.edu xduan@chem.ucla.edu.
authors.forename: William A
authors.initials: WA
authors.lastname: Goddard
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. wag@wag.caltech.edu yhuang@seas.ucla.edu xduan@chem.ucla.edu.|California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA. wag@wag.caltech.edu yhuang@seas.ucla.edu xduan@chem.ucla.edu.|California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA.
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan