Journal
CHEMCATCHEM
Volume 10, Issue 5, Pages 925-930Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201701578
Keywords
alloys; copper; palladium; reduction; tetrapods
Categories
Funding
- Collaborative Innovation Center of Suzhou Nano Science and Technology, MOST of China [2014CB932700]
- NSFC [21573206, 51371164]
- Key Research Program of Frontier Sciences of the CAS [QYZDB-SSW-SLH017]
- Strategic Priority Research Program B of the CAS [XDB01020000]
- Anhui Provincial Key Scientific and Technological Project [1704a0902013]
- Fundamental Research Funds for the Central Universities
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The development of superior non-Pt catalysts for the oxygen reduction reaction (ORR) is highly desirable but still challenging. Herein, we prepared 50-nm CuPd tetrapods with catalytic performance towards the alkaline ORR that was higher than that of Pd nanoparticles, CuPd nanoparticles, CuPd tetrahedrons, and 7-nm CuPd tetrapods. The mass activity of 50-nm CuPd tetrapods was 0.29AmgPd(-1), which was superior to that of commercial Pt/C and most Pd-based catalysts reported to date. Mechanistic studies revealed that the enhanced performance could be attributed to the synergy of the alloy effect and sharp-tip effect, both of which enable the accumulation of negative charges on the Pd atoms at the vertices of the tetrapods. The high negative charge density of the Pd atoms at the vertices lowers the Pd d-band center and, thus, its oxygen adsorption energy. This work provides a pathway to improve the activity of ORR catalysts by modulating their electronic structures, which opens up new sight to design promising non-Pt catalysts for the ORR.
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