journal article·2020-04-06

In-Situ Probing of Crystal-Phase-Dependent Photocatalytic Activities of Au Nanostructures by Surface-Enhanced Raman Spectroscopy

Jingtao Huang, Wenxin Niu, Cuiling Li, Chaoliang Tan, Pengfei Yin, Hongfei Cheng, Zhaoning Hu, Nailiang Yang, Qiyuan He, Gwang-Hyeon Nam, Hua Zhang

ACS Materials Letters· Volume 2· Issue 4
Publisher page

Abstract

The crystal phase of noble metals has been identified as one of the key parameters that can greatly affect their properties and functionalities. However, research on the crystal-phase-dependent catalytic activities of noble metals has been rarely reported. Here, we report a systematic study of surface-plasmon-driven hot-electron-induced photocatalytic reduction of para-nitrothiophenol (pNTP) to p,p′-dimercaptoazobenzene under visible light on Au nanostructures with different crystal phases by in-situ surface-enhanced Raman spectroscopy (SERS). Our results indicate that the photocatalytic rate of unconventional 4H Au is nearly 6–8 times that of conventional face-centered cubic (fcc) Au, suggesting the greater activity of hot electrons on 4H Au. Further electrochemical reductions of pNTP on the 4H and fcc Au nanostructures in aqueous solutions also confirm the higher catalytic activity of the 4H Au. Our study demonstrates that the synthesis of Au nanomaterials with controlled crystal phases paves the way for developing highly efficient catalyst.
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Research context

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Copper-based nanomaterials and applications · Nanomaterials for catalytic reactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

University of Science and Technology of China, Hefei, China

Department of Chemistry, City University of Hong Kong, Hong Kong, China

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong, China

Funding

Agency for Science, Technology and Research · Ministry of Education - Singapore · City University of Hong Kong · National Natural Science Foundation of China · Nanyang Technological University

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