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Title: Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation

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.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [3] ;  [4] ;  [5] ; ORCiD logo [2] ; ORCiD logo [6] ; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Harbin Inst. of Technology (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Harbin Inst. of Technology (China)
  6. Univ. of Pennsylvania, Philadelphia, PA (United States)
Publication Date:
Report Number(s):
BNL-209674-2018-JAAM
Journal ID: ISSN 2520-1158
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nature Catalysis
Additional Journal Information:
Journal Name: Nature Catalysis; Journal ID: ISSN 2520-1158
Publisher:
Springer Nature
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; CoPd; AP-XPS; STEM; CO Oxidation
OSTI Identifier:
1485440

Wu, Cheng Hao, Liu, Chang, Su, Dong, Xin, Huolin L., Fang, Hai-Tao, Eren, Baran, Zhang, Sen, Murray, Christopher B., and Salmeron, Miquel B.. Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation. United States: N. p., Web. doi:10.1038/s41929-018-0190-6.
Wu, Cheng Hao, Liu, Chang, Su, Dong, Xin, Huolin L., Fang, Hai-Tao, Eren, Baran, Zhang, Sen, Murray, Christopher B., & Salmeron, Miquel B.. Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation. United States. doi:10.1038/s41929-018-0190-6.
Wu, Cheng Hao, Liu, Chang, Su, Dong, Xin, Huolin L., Fang, Hai-Tao, Eren, Baran, Zhang, Sen, Murray, Christopher B., and Salmeron, Miquel B.. 2018. "Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation". United States. doi:10.1038/s41929-018-0190-6.
@article{osti_1485440,
title = {Bimetallic synergy in cobalt–palladium nanocatalysts for CO oxidation},
author = {Wu, Cheng Hao and Liu, Chang and Su, Dong and Xin, Huolin L. and Fang, Hai-Tao and Eren, Baran and Zhang, Sen and Murray, Christopher B. and Salmeron, Miquel B.},
abstractNote = {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 Co0.26Pd0.74, 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.},
doi = {10.1038/s41929-018-0190-6},
journal = {Nature Catalysis},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {12}
}

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