Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation

Wu, Cheng Hao; Liu, Chang; Su, Dong; Xin, Huolin L.; Fang, Hai-Tao; Eren, Baran; Zhang, Sen; Murray, Christopher B.; Salmeron, Miquel B.

doi:10.1038/s41929-018-0190-6

Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation

Journal Article · Mon Dec 10 00:00:00 EST 2018 · Nature Catalysis

DOI:https://doi.org/10.1038/s41929-018-0190-6· OSTI ID:1485440

^[1]; Liu, Chang ^[2]; ^[3]; ^[3]; Fang, Hai-Tao ^[4]; Eren, Baran ^[5]; ^[2]; ^[6]; ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of Virginia, Charlottesville, VA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Harbin Inst. of Technology (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Harbin Inst. of Technology (China)
Univ. of Pennsylvania, Philadelphia, PA (United States)

Bimetallic and multi-component catalysts often exhibit superior activity and selectivity compared with their single-component counterparts. To investigate the origin of the composition dependence observed in the catalytic activities of CoPd bimetallic catalysts, the compositional and structural evolution of monodisperse CoPd alloy nanoparticles (NPs) were followed under catalytic CO oxidation conditions using ambient pressure X-ray spectroscopy (AP-XPS) and transmission electron microscopy (TEM). It was found that the catalysis process induced a reconstruction of the catalysts, leaving CoOx on the NP surface. The synergy between Pd and CoOx coexisting on the surface promotes the catalytic activity of the bimetallic catalysts. Such synergistic effects can be optimized by tuning the Co/Pd ratios in the NP synthesis and reach a maximum at compositions near Co_0.26Pd_0.74, which exhibits the lowest temperature for complete CO conversion. Our combined AP-XPS and TEM studies provide a direct observation of the bimetallic NPs surface evolution under catalytic conditions and its correlation to catalytic properties.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; SC0012704

OSTI ID:: 1485440

Alternate ID(s):: OSTI ID: 1604669

Report Number(s):: BNL--209674-2018-JAAM

Journal Information:: Nature Catalysis, Journal Name: Nature Catalysis Vol. 2; ISSN 2520-1158

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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