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Atomic-Scale Observation of Bimetallic Au-CuOx Nanoparticles and Their Interfaces for Activation of CO Molecules
Luo, Jingjie; Liu, Yuefeng; Zhang, Liyun; Ren, Yujing; Miao, Shu; Zhang, Bingsen; Su, Dang Sheng; Liang, Changhai
2019-09-25
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume11Issue:38Pages:35468-35478
AbstractSupported gold nanoparticles with sizes below 5 nm display attractive catalytic activities for heterogeneous reactions, particularly those promoted by secondary metal (e.g., Cu) because of the well-defined synergy between metal compositions. However, the specific atomic structure at interfaces is less interpreted systematically. In this work, various bimetallic Au-CuOx catalysts with specific surface structures were synthesized and explored by aberration-corrected scanning transmission electron microscopy (AC-STEM), temperature-programmed experiments and in situ DRIFT experiments. Results suggest that the atomic structure and interfaces between gold and CuOx a are determined by the nucleation behaviors of the nanoparticles and result in subsequently the distinctive ability for CO activation. Bimetallic CuO*/Au sample formatted by gold particles surrounded with CuOx nanoclusters have rough surface with prominently exposed low-coordinated Au step defects. Whereas the bimetallic Au@CuO sample formatted by copper precursor in the presence of gold nanoparticles have core-shell structure with relatively smooth surface. The former structure of CuO*/Au displays much accelerated properties for CO adsorption and activation with 90% CO converted to CO2 at 90 degrees C and nice stability with time on stream. The results clearly determine from atomic scale the significance of exposed gold step sites and intrinsic formation of defected surface by different nucleation. The above properties are directly responsible for the induced variation in chemical composition and the catalytic activity.
KeywordAu catalysis Au-Cu bimetallic particles defect-enriched surface step sites CO activation
Indexed BySCI
Language英语
WOS IDWOS:000488322900102
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80757
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Luo, Jingjie,Liu, Yuefeng,Zhang, Liyun,et al. Atomic-Scale Observation of Bimetallic Au-CuOx Nanoparticles and Their Interfaces for Activation of CO Molecules[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(38):35468-35478.
APA Luo, Jingjie.,Liu, Yuefeng.,Zhang, Liyun.,Ren, Yujing.,Miao, Shu.,...&Liang, Changhai.(2019).Atomic-Scale Observation of Bimetallic Au-CuOx Nanoparticles and Their Interfaces for Activation of CO Molecules.ACS APPLIED MATERIALS & INTERFACES,11(38),35468-35478.
MLA Luo, Jingjie,et al."Atomic-Scale Observation of Bimetallic Au-CuOx Nanoparticles and Their Interfaces for Activation of CO Molecules".ACS APPLIED MATERIALS & INTERFACES 11.38(2019):35468-35478.
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