Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
5 years ago

Electrogenerated Chemiluminescence Imaging of Electrocatalysis at Single Au-Pt Janus Nanoparticle

Xiao-Yu Gao, Hong-Yuan Chen, Jian-Bin Pan, Xing-Hua Xia, Wei Zhao, Zeng-Qiang Wu, Jing-Juan Xu, Meng-Jiao Zhu
Noble metal nanoparticles are promising catalysts in electrochemical reactions, while understanding the relationship between the structure and reactivity of the particles is important to achieve higher efficiency of electrocatalysis, and promote the development of single-molecule electrochemistry. Herein, we employ electrogenerated chemiluminescence (ECL) to image the catalytic oxidation of luminophore at single Au, Pt and Au-Pt Janus nanoparticles. Compared to monometal, the Janus particle structure exhibited enhanced ECL intensity and stability, indicating better catalytic efficiency. On the basis of the experimental results and digital simulation, it was concluded that concentration difference arose at the asymmetric bimetallic interface according to different heterogeneous electron-transfer rate constants at Au and Pt. The fluid slip around Janus particle enhanced local redox reactions and protected the surface of particle from passivation. Materials with Janus structure holds potential in electrocatalysis and energy conversion. ECL imaging which pro-vides direct readout of electrochemical activity is applicable for the design and optimization of catalysts.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201800706

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