Chinese Journal of Catalysis ›› 2024, Vol. 57: 59-67.DOI: 10.1016/S1872-2067(23)64589-9

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Unraveling the electro-oxidation steps of methanol on a single nanoparticle by in situ nanoplasmonic scattering spectroscopy

Xiangqi Zhoua,e,1, Lili Lid,1, Jun-Gang Wangb,*(), Zhanbo Lic, Xiji Shaof, Fupeng Chenga, Linjuan Zhanga,h, Jian-Qiang Wanga,h, Akhil Jaing, Tao Linc,*(), Chao Jinga,h,*()   

  1. aKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    bSchool of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
    cCollege of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China
    dState Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
    eKey Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, Hunan, China
    fDepartment of Physics, School of Intelligent Engineering, Shaoguan University, Shaoguan 512005, Guangdong, China
    gBioelectronics Laboratory, School of Pharmacy, Biodiscovery Institute, University of Nottingham, Nottingham NG7 2RD, UK
    hUniversity of Chinese Academy of Sciences, Beijing, 100049, China
  • Received:2023-11-22 Accepted:2023-12-21 Online:2024-02-18 Published:2024-02-10
  • Contact: * E-mail: jgwang@sit.edu.cn (J.-G. Wang), lintao@sztu.edu.cn (T. Lin), jingchao@sinap.ac.cn (C. Jing).
  • About author:1 Contributed equally to this work.
  • Supported by:
    “Transformational Technologies for Clean Energy and Demonstration,” Strategic Priority Research Program of the Chinese Academy of Sciences(XDA2100000);National Science Foundation of China(21802042);National Science Foundation of China(21902050);National Science Foundation of China(22374101);National Science Foundation of China(22209201);Shanghai Sailing Program(18YF1405700);Shanghai Sailing Program(21YF1456100);K. C. Wong Education Foundation(GJTD-2018-10);Youth Innovation Promotion Association, Chinese Academy of Sciences(Y201842);Youth Innovation Promotion Association, Chinese Academy of Sciences(2023270);DNL Cooperation Fund, CAS(DNL202008);Natural Science Foundation of Top Talent of SZTU(2019210);Startup Funding from Shaoguan University(440/9900064706);Engineering and Physical Sciences Research Council, UK (EP/R004072/1 to Dr Frankie Rawson which funded the post-doc position of Dr Akhil Jain)(EP/R004072/1)

Abstract:

Understanding the mechanism of methanol oxidation reaction (MOR) remains a challenge in the development of direct methanol fuel cells. Large-scale investigations of the MOR encounter issues related to mass transfer and averaging effects. To address these limitations, exploring the MOR on the surfaces of individual nanocatalyst and precisely identifying the reaction steps can yield valuable insights into the underlying pathways. In this study, we employed in situ nanoplasmonic resonance scattering spectroscopy to dynamically monitor the MOR process on single gold nanorod particles (GNPs) and Pt-coated gold nanoparticles (Pt-GNPs). We observed the evolution of metal hydroxides, which was assumed as the active species. Notably, the dynamic behavior of the surface atomic layers revealed the rate-determining steps for both the GNPs and Pt-GNPs, indicating competitive adsorption of intermediates on the nanocatalyst surface. The resulting inherent reaction mechanism highlights the thermodynamics-dependent catalysts’ redox processes and their surface adsorptions, which holds significance for advancing highly active MOR catalysts.

Key words: Single nanoparticle detection, Dark-field microscopy, Plasmon resonance scattering, spectroscopy, Methanol oxidation reaction, Nano-electrochemistry