Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation

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

doi:10.1021/jacs.7b01784

Crystal Structural Effect of AuCu Alloy Nanoparticles on Catalytic CO Oxidation

Journal Article · Wed Jun 07 00:00:00 EDT 2017 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.7b01784· OSTI ID:1399233

Zhan, Wangcheng ^[1]; Wang, Jinglin ^[1]; Wang, Haifeng ^[1]; ^[2]; Liu, Xiaofei ^[3]; ^[2]; ^[2]; Guo, Yanglong ^[1]; Guo, Yun ^[1]; ^[1]; ^[4]; ^[5]; ^[2]

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399233

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 26 Vol. 139; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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