Highly Durable Platinum Single-Atom Alloy Catalyst for Electrochemical Reactions

Publication: Research - peer-reviewJournal article – Annual report year: 2018

DOI

  • Author: Kim, Jiwhan

    Korea Advanced Institute of Science and Technology, Korea, Republic of

  • Author: Roh, Chi-Woo

    Korea Advanced Institute of Science and Technology, Korea, Republic of

  • Author: Sahoo, Suman Kalyan

    University of Seoul, Korea, Republic of

  • Author: Yang, Sungeun

    Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Bae, Junemin

    Korea Advanced Institute of Science and Technology, Korea, Republic of

  • Author: Han, Jeong Woo

    University of Seoul, Korea, Republic of

  • Author: Lee, Hyunjoo

    Korea Advanced Institute of Science and Technology, Korea, Republic of

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Single atomic Pt catalyst can offer efficient utilization of the expensive platinum and provide unique selectivity because it lacks ensemble sites. However, designing such a catalyst with high Pt loading and good durability is very challenging. Here, single atomic Pt catalyst supported on antimony-doped tin oxide (Pt1/ATO) is synthesized by conventional incipient wetness impregnation, with up to 8 wt% Pt. The single atomic Pt structure is confirmed by high-angle annular dark field scanning tunneling electron microscopy images and extended X-ray absorption fine structure analysis results. Density functional theory calculations show that replacing Sb sites with Pt atoms in the bulk phase or at the surface of SbSn or ATO is energetically favorable. The Pt1/ATO shows superior activity and durability for formic acid oxidation reaction, compared to a commercial Pt/C catalyst. The single atomic Pt structure is retained even after a harsh durability test, which is performed by repeating cyclic voltammetry in the range of 0.05–1.4 V for 1800 cycles. A full cell is fabricated for direct formic acid fuel cell using the Pt1/ATO as an anode catalyst, and an order of magnitude higher cell power is obtained compared to the Pt/C.
Original languageEnglish
Article number1701476
JournalAdvanced Energy Materials
Volume8
Issue number1
Number of pages8
ISSN1614-6832
DOIs
StatePublished - 2018
CitationsWeb of Science® Times Cited: 1
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