Li, Mufan and Zhao, Zipeng and Cheng, Tao and Fortunelli, Alessandro and Chen, Chih-Yen and Yu, Rong and Zhang, Qinghua and Gu, Lin and Merinov, Boris V. and Lin, Zhaoyang and Zhu, Enbo and Yu, Ted and Jia, Qingying and Guo, Jinghua and Zhang, Liang and Goddard, William A., III and Huang, Yu and Duan, Xiangfeng (2016) Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction. Science, 354 (6318). pp. 1414-1419. ISSN 0036-8075. doi:10.1126/science.aaf9050. https://resolver.caltech.edu/CaltechAUTHORS:20161121-104400912
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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.
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| 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)]. | ||||||||||||||||||||||||||
| Group: | JCAP | ||||||||||||||||||||||||||
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| Issue or Number: | 6318 | ||||||||||||||||||||||||||
| DOI: | 10.1126/science.aaf9050 | ||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20161121-104400912 | ||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20161121-104400912 | ||||||||||||||||||||||||||
| Official Citation: | Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction By Mufan Li, Zipeng Zhao, Tao Cheng, Alessandro Fortunelli, Chih-Yen Chen, Rong Yu, Qinghua Zhang, Lin Gu, Boris V. Merinov, Zhaoyang Lin, Enbo Zhu, Ted Yu, Qingying Jia, Jinghua Guo, Liang Zhang, William A. Goddard III, Yu Huang, Xiangfeng Duan Science 16 Dec 2016: Vol. 354, Issue 6318, pp. 1414-1419 DOI: 10.1126/science.aaf9050 | ||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||
| ID Code: | 72196 | ||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||||||||||||
| Deposited On: | 21 Nov 2016 19:01 | ||||||||||||||||||||||||||
| Last Modified: | 11 Nov 2021 04:57 |
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