Engineering bunched Pt-Ni alloy nanocages for efficient oxygen reduction in practical fuel cells

Xinlong Tian (Corresponding author), Xiao Zhao, Ya Qiong Su, Lijuan Wang, Hongming Wang, Dai Dang, Bin Chi, Hongfang Liu, Emiel J.M. Hensen, Xiong Wen Lou (Corresponding author), Bao Yu Xia (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

94 Citations (Scopus)

Abstract

Development of efficient and robust electrocatalysts is critical for practical fuel cells. We report one-dimensional bunched platinum-nickel (Pt-Ni) alloy nanocages with a Pt-skin structure for the oxygen reduction reaction that display high mass activity (3.52 amperes per milligram platinum) and specific activity (5.16 milliamperes per square centimeter platinum), or nearly 17 and 14 times higher as compared with a commercial platinum on carbon (Pt/C) catalyst. The catalyst exhibits high stability with negligible activity decay after 50,000 cycles. Both the experimental results and theoretical calculations reveal the existence of fewer strongly bonded platinum-oxygen (Pt-O) sites induced by the strain and ligand effects. Moreover, the fuel cell assembled by this catalyst delivers a current density of 1.5 amperes per square centimeter at 0.6 volts and can operate steadily for at least 180 hours.

Original languageEnglish
Pages (from-to)850-856
Number of pages7
JournalScience
Volume366
Issue number6467
DOIs
Publication statusPublished - 15 Nov 2019

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    Tian, X., Zhao, X., Su, Y. Q., Wang, L., Wang, H., Dang, D., Chi, B., Liu, H., Hensen, E. J. M., Lou, X. W., & Xia, B. Y. (2019). Engineering bunched Pt-Ni alloy nanocages for efficient oxygen reduction in practical fuel cells. Science, 366(6467), 850-856. https://doi.org/10.1126/science.aaw7493