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DNA-Directed Growth of Pd Nanocrystals on Carbon Nanotubes towards Efficient Oxygen Reduction Reactions

Authors

  • Lian Ying Zhang,

    1. Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, 400715 (P. R. China)
    2. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources, Chongqing, 400715 (P. R. China)
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    • These authors contributed equally to this work.

  • Dr. Chun Xian Guo,

    1. Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, 400715 (P. R. China)
    2. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources, Chongqing, 400715 (P. R. China)
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    • These authors contributed equally to this work.

  • Dr. Zhiming Cui,

    1. School of Chemical and Biomedical Engineering and Centre for Advanced Bionanosystems, Nanyang Technological University, Singapore, 637457 (Singapore), Fax: (+65) 67911761
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  • Dr. Jun Guo,

    1. School of Material Science and Engineering, Nanyang Technological University, Singapore, 639798 (Singapore)
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  • Prof. Zhili Dong,

    1. School of Material Science and Engineering, Nanyang Technological University, Singapore, 639798 (Singapore)
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  • Prof. Chang Ming Li

    Corresponding author
    1. Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, 400715 (P. R. China)
    2. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources, Chongqing, 400715 (P. R. China)
    3. School of Chemical and Biomedical Engineering and Centre for Advanced Bionanosystems, Nanyang Technological University, Singapore, 637457 (Singapore), Fax: (+65) 67911761
    • Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, 400715 (P. R. China)
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Abstract

Unique DNA-promoted Pd nanocrystals on carbon nanotubes (Pd/DNA–CNTs) are synthesized for the first time, in which through its regularly arranged PO43− groups on the sugar–phosphate backbone, DNA directs the growth of ultrasmall Pd nanocrytals with an average size of 3.4 nm uniformly distributed on CNTs. The Pd/DNA–CNT catalyst shows much more efficient electrocatalytic activity towards oxygen reduction reaction (ORR) with a much more positive onset potential, higher catalytic current density and better stability than other Pd-based catalysts including Pd nanocrystals on carbon nanotubes (Pd/CNTs) without the use of DNA and commercial Pd/C catalyst. In addition, the Pd/DNA–CNTs catalyst provides high methanol tolerance. The high electrocatalytic performance is mainly contributed by the ultrasmall Pd nanocrystal particles grown directed by DNA to enhance the mass transport rate and to improve the utilization of the Pd catalyst. This work may demonstrate a universal approach to fabricate other superior metal nanocrystal catalysts with DNA promotion for broad applications in energy systems and sensing devices.

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