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Improved ethanol electrooxidation performance by shortening Pd–Ni active site distance in Pd–Ni–P nanocatalysts

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Chen, Lin, Lu, Lilin, Zhu, Hengli, Chen, Yueguang, Huang, Yu, Li, Yadong, Wang, Leyu·2017·Nature Communications
DOI 10.1038/ncomms14136
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Abstract

Incorporating oxophilic metals into noble metal-based catalysts represents an emerging strategy to improve the catalytic performance of electrocatalysts in fuel cells. However, effects of the distance between the noble metal and oxophilic metal active sites on the catalytic performance have rarely been investigated. Herein, we report on ultrasmall (∼5 nm) Pd–Ni–P ternary nanoparticles for ethanol electrooxidation. The activity is improved up to 4.95 A per mg Pd, which is 6.88 times higher than commercial Pd/C (0.72 A per mg Pd), by shortening the distance between Pd and Ni active sites, achieved through shape transformation from Pd/Ni–P heterodimers into Pd–Ni–P nanoparticles and tuning the Ni/Pd atomic ratio to 1:1. Density functional theory calculations reveal that the improved activity and stability stems from the promoted production of free OH radicals (on Ni active sites) which facilitate the oxidative removal of carbonaceous poison and combination with CH 3 CO radicals on adjacent Pd active sites.

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Metadata

Authors
Chen, L., Lu, L., Zhu, H., Chen, Y., Huang, Y., Li, Y., & Wang, L.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2017-04-01
Volume
8
Issue
1
Pages
14136-14136
ISSN
2041-1723 (ISSN-L)
DOI
10.1038/ncomms14136
OpenAlex
W2568774951
Cited by
491
References
4
FWCI
13.95
Type
journal article
Language
en
Update notices
correction (2020-03-09)
Open access
gold
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