CaltechAUTHORS
Published December 16, 2016 | Version Submitted + Supplemental Material
Journal Article Open

Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction

Creators

  • 1. ROR icon University of California, Los Angeles
  • 2. ROR icon California Institute of Technology
  • 3. ROR icon National Research Council
  • 4. ROR icon Tsinghua University
  • 5. ROR icon Institute of Physics
  • 6. ROR icon California State University, Long Beach
  • 7. ROR icon Northeastern University
  • 8. ROR icon Lawrence Berkeley National Laboratory
  • 9. ROR icon California NanoSystems Institute

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.

Additional Information

© 2016 American Association for the Advancement of Science. Received 18 April 2016; resubmitted 25 August 2016. Accepted 26 October 2016; Published online 17 November 2016. Supported by DOE Office of Basic Energy Sciences, Division of Materials Science and Engineering, award DE-SC0008055 (X.D., M.L., and Z.L. for materials synthesis and characterizations); NSF grant CHE-1508692 (Y.H., Z.Z., and E.Z. for electrochemical studies); NSF grant CBET-1512759 (W.A.G., A.F., B.V.M., and T.C. for theoretical computations); and National Natural Science Foundation of China project numbers 51525102, 51390475, and 51371102 (R.Y. for STEM studies). The Advanced Light Source is supported by the Office of Science, Office of Basic Energy Sciences, of DOE under contract DE-AC02-05CH11231. We thank M. A. Marcus for support during the acquisition of XAS data and C. Wu for help with EXAFS data analysis. The aberration-corrected TEM results were achieved (in part) using Titan 80-300 and JEM-ARM 200F. In this work we used the resources of the National Center for Electron Microscopy in Beijing. A patent application on this subject has been filed [UC case no. 2017-108-1-LA (102352-0512)].

Attached Files

Submitted - Li.SM.pdf

Supplemental Material - Science-JPtNW-Huang-Oct14-wag.pdf

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Li.SM.pdf

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Additional details

Identifiers

Eprint ID
72196
DOI
10.1126/science.aaf9050
Resolver ID
CaltechAUTHORS:20161121-104400912

Related works

Describes
10.1126/science.aaf9050 (DOI)

Funding

Department of Energy (DOE)
DE-SC0008055
NSF
CHE-1508692
NSF
CBET-1512759
National Natural Science Foundation of China
51525102
National Natural Science Foundation of China
51390475
National Natural Science Foundation of China
51371102
Department of Energy (DOE)
DE-AC02-05CH11231

Dates

Created
2016-11-21
Created from EPrint's datestamp field
Updated
2021-11-11
Created from EPrint's last_modified field

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