Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation
Abstract
Controlling the physical and chemical properties of alloy nanoparticles (NPs) is an important approach to optimize NP catalysis. Unlike other tuning knobs, such as size, shape, and composition, crystal structure has received limited attention and not been well understood for its role in catalysis. This deficiency is mainly due to the difficulty in synthesis and fine-tuning of the NPs’ crystal structure. Here, Exemplifying by AuCu alloy NPs with face centered cubic (fcc) and face centered tetragonal (fct) structure, we demonstrate a remarkable difference in phase segregation and catalytic performance depending on the crystal structure. During the thermal treatment in air, the Cu component in fcc-AuCu alloy NPs segregates more easily onto the alloy surface as compared to that in fct-AuCu alloy NPs. As a result, after annealing at 250 °C in air for 1 h, the fcc- and fct-AuCu alloy NPs are phase transferred into Au/CuO and AuCu/CuO core/shell structures, respectively. More importantly, this variation in heterostructures introduces a significant difference in CO adsorption on two catalysts, leading to a largely enhanced catalytic activity of AuCu/CuO NP catalyst for CO oxidation. Furthermore, the same concept can be extended to other alloy NPs, making it possible to fine-tune NP catalysis formore »
- Authors:
-
- East China Univ. of Science and Technology, Shanghai (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- East China Univ. of Science and Technology, Shanghai (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Brown Univ., Providence, RI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1399233
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 139; Journal Issue: 26; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Zhan, Wangcheng, Wang, Jinglin, Wang, Haifeng, Zhang, Jinshui, Liu, Xiaofei, Zhang, Pengfei, Chi, Miaofang, Guo, Yanglong, Guo, Yun, Lu, Guanzhong, Sun, Shouheng, Dai, Sheng, and Zhu, Huiyuan. Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation. United States: N. p., 2017.
Web. doi:10.1021/jacs.7b01784.
Zhan, Wangcheng, Wang, Jinglin, Wang, Haifeng, Zhang, Jinshui, Liu, Xiaofei, Zhang, Pengfei, Chi, Miaofang, Guo, Yanglong, Guo, Yun, Lu, Guanzhong, Sun, Shouheng, Dai, Sheng, & Zhu, Huiyuan. Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation. United States. https://doi.org/10.1021/jacs.7b01784
Zhan, Wangcheng, Wang, Jinglin, Wang, Haifeng, Zhang, Jinshui, Liu, Xiaofei, Zhang, Pengfei, Chi, Miaofang, Guo, Yanglong, Guo, Yun, Lu, Guanzhong, Sun, Shouheng, Dai, Sheng, and Zhu, Huiyuan. Wed .
"Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation". United States. https://doi.org/10.1021/jacs.7b01784. https://www.osti.gov/servlets/purl/1399233.
@article{osti_1399233,
title = {Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation},
author = {Zhan, Wangcheng and Wang, Jinglin and Wang, Haifeng and Zhang, Jinshui and Liu, Xiaofei and Zhang, Pengfei and Chi, Miaofang and Guo, Yanglong and Guo, Yun and Lu, Guanzhong and Sun, Shouheng and Dai, Sheng and Zhu, Huiyuan},
abstractNote = {Controlling the physical and chemical properties of alloy nanoparticles (NPs) is an important approach to optimize NP catalysis. Unlike other tuning knobs, such as size, shape, and composition, crystal structure has received limited attention and not been well understood for its role in catalysis. This deficiency is mainly due to the difficulty in synthesis and fine-tuning of the NPs’ crystal structure. Here, Exemplifying by AuCu alloy NPs with face centered cubic (fcc) and face centered tetragonal (fct) structure, we demonstrate a remarkable difference in phase segregation and catalytic performance depending on the crystal structure. During the thermal treatment in air, the Cu component in fcc-AuCu alloy NPs segregates more easily onto the alloy surface as compared to that in fct-AuCu alloy NPs. As a result, after annealing at 250 °C in air for 1 h, the fcc- and fct-AuCu alloy NPs are phase transferred into Au/CuO and AuCu/CuO core/shell structures, respectively. More importantly, this variation in heterostructures introduces a significant difference in CO adsorption on two catalysts, leading to a largely enhanced catalytic activity of AuCu/CuO NP catalyst for CO oxidation. Furthermore, the same concept can be extended to other alloy NPs, making it possible to fine-tune NP catalysis for many different chemical reactions.},
doi = {10.1021/jacs.7b01784},
journal = {Journal of the American Chemical Society},
number = 26,
volume = 139,
place = {United States},
year = {Wed Jun 07 00:00:00 EDT 2017},
month = {Wed Jun 07 00:00:00 EDT 2017}
}
Web of Science
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