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Title: Engineering bunched Pt-Ni alloy nanocages for efficient oxygen reduction in practical fuel cells
Authors: Tian, Xinlong
Zhao, Xiao
Su, Ya-Qiong
Wang, Lijuan
Wang, Hongming
Dang, Dai
Chi, Bin
Liu, Hongfang
Hensen, Emiel J. M.
Lou, David Xiong Wen
Xia, Bao Yu
Keywords: Engineering::Chemical technology
Issue Date: 2019
Source: Tian, X., Zhao, X., Su, Y.-Q., Wang, L., Wang, H., Dang, D., . . . Xia, B. Y. (2019). Engineering bunched Pt-Ni alloy nanocages for efficient oxygen reduction in practical fuel cells. Science, 366(6467), 850-856. doi:10.1126/science.aaw7493
Journal: Science
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.
ISSN: 0036-8075
DOI: 10.1126/science.aaw7493
Rights: © 2019 The Authors. Some rights reserved. This paper was published by American Association for the Advancement of Science in Science and is made available with permission of The Authors.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles


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