2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
| Cyclic Voltammetry on Nanoelectrode and Nanostructured Electrode Dongping Zhan1; Zhongqun Tian2; 1DEPARTMENT OF CHEMISTRY, XIAMEN UNIVERSITY, Xiamen, China; 2DEPARTMENT OF CHEMISTRY, XIAMEN UINVERSITY, Xiamen, China; PAPER: 160/Electrochemistry/Regular (Oral) SCHEDULED: 11:20/Wed./Copacabana B (150/1st) ABSTRACT: Prof. Christian Amatore is one of the pioneering and most authoritative scientists on ultramicroelectrodes, in both its fundamentals and methodologies. In his honorary symposium, we would like to give a mini-review of our work on nanoelectrodes at Xiamen University, to which many helpful discussions were contributed by our respected old friend, Prof. Amatore. First, we will present a method based on Fick's second law, to further prove the surface diffusion of adsorbates and quantitative measurements of surface diffusion coefficient of Faraday adsorbates on Au or Pt nanoelectrodes. Second, we will present the single molecular enzyme catalysis on the nanoelectrode, including a statistical method to obtain the turnover number of single molecular enzymes. Third, we will present the plasmon-induced voltammetric behavior on the nanostructured Au electrode. The mobility of adsorptive atoms and molecules on catalyst surfaces is one of the most fundamental issues in solid surface science. It plays a pivotal role in various physiochemical processes, especially in thin-film deposition and heterogeneous catalysis. Quantifying the surface mobility will aid in a more in-depth understanding of the mechanism underlying these processes. Therefore, numerous spectroscopic methods have been developed for measuring surface diffusion coefficients, and many systematic investigations have been performed on solid surfaces in vacuum or atmospheric environment. However, studying surface mobility on solid surface in liquid environment, especially in electrochemical systems, still faces challenges both in experiment and theory. The reason mainly stems from the fact that most of the techniques adopted for surface diffusion traditionally don't work at solid/liquid interfaces. Moreover, the co-adsorption of the water molecules or electrolyte ions, and the presence of strong electric fields make it extremely complicated at the electrochemical interface. Nevertheless, information on the transport and interaction of atoms or molecules on electrode surfaces is badly needed for gaining insights into many electrochemical interface processes, such as electrodeposition and electrocatalysis. These processes are directly related to electrochemical energy conversion, metal electrode processes, as well as other electrocatalytic domains. References: [1] W. Wang, J. Zhang, F. Wang, B.-W. Mao, D. Zhan, Z.-Q. Tian, Mobility and Reactivity of Oxygen Adspecies on Platinum Surface, J. Am. Chem. Soc. 2016, 138, 9057-9060. [2] D. Zhan, J.Velmurugan, M. V. Mirkin, Adsorption/Desorption of Hydrogen on Pt Nanoelectrodes: Evidence of Surface Diffusion and Spillover. J Am Chem Soc 2009, 131 (41), 14756-14760. [3] L. Han, W. Wang, J. Nsabimana, J.-W. Yan, B. Ren, Dongping Zhan, Single molecular catalysis of a redox enzyme on nanoelectrodes, Faraday Discuss., 2016, 193, 133-139. [4] D. Huang, Q. He, J.-J. Shan, M. Sartin, R. Pang, F.-Z. Yang, Y. Zhou, B. Ren, Z.-Q. Tian, D. Zhan, Illuminating nanostructured gold electrode: surface plasmon or electron ejection? Faraday Discuss. 2018, DOI: 10.1039/C8FD00012C |
