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Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction.
Li, Mufan; Zhao, Zipeng; Cheng, Tao; Fortunelli, Alessandro; Chen, Chih-Yen; Yu, Rong; Zhang, Qinghua; Gu, Lin; Merinov, Boris V; Lin, Zhaoyang; Zhu, Enbo; Yu, Ted; Jia, Qingying; Guo, Jinghua; Zhang, Liang; Goddard, William A; Huang, Yu; Duan, Xiangfeng.
Afiliação
  • Li M; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
  • Zhao Z; Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
  • Cheng T; Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
  • Fortunelli A; Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
  • Chen CY; CNR-ICCOM, Consiglio Nazionale delle Ricerche, 56124 Pisa, Italy.
  • Yu R; Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
  • Zhang Q; National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
  • Gu L; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
  • Merinov BV; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
  • Lin Z; Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
  • Zhu E; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
  • Yu T; Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
  • Jia Q; Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA.
  • Guo J; Department of Chemical Engineering, California State University, Long Beach, CA 90840, USA.
  • Zhang L; Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA.
  • Goddard WA; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Huang Y; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Duan X; 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.
Science ; 354(6318): 1414-1419, 2016 12 16.
Article em En | MEDLINE | ID: mdl-27856847
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.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Estados Unidos
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Estados Unidos