Functional electrodes for electrosynthesis, energy storage and environmental applications

2019年04月10日

报告题目:Functional electrodes for electrosynthesis, energy storage and environmental applications

报告人:Mathieu ETIENNE, CNRS Research Director,CNRS - Université de Lorraine, France.

时间:2019-04-15 下午16:30-18:00

地点:卢嘉锡楼202报告厅

报告摘要:

Surface functionalization are essential to tune electrochemical activity of electrodes versus a large variety of electrolytes. In this communication, I would like to give some examples of recent work on surface functionalization for electrosynthesis, energy storage and environmental applications.

Electrosynthesis will be considered from the point of view of NAD(P)H regeneration [1]. There is today a great interest for flow biocatalytic processes which combine several cascade reactions leading to the synthesis of molecules of interest in various industrial fields, in particular pharmaceutical and food. The cofactor NAD(P)H plays a very important role in biological systems and can also be applied as an electron carrier in enzymatic systems catalyzing stereo- and regioselective reactions having a great biotechnological potential for example for the

production of pure enantiomers, the reduction of CO2 or the selective oxidation of complex molecules. I will describe the immobilization of the catalyst [Cp*Rh(bpy)Cl] + and dehydrogenases for electroenzymatic synthesis.

Energy storage will be considered from the point of view of redox flow batteries (RFB) [2]. All-vanadium RFB are now considered as a robust alternative to lithium batteries for renewable energy storage. I will describe a protocol for layer-by-layer deposition of carbon nanotubes on electrode surface and the influence of this surface modification on the electrochemical reactions with a vanadium electrolyte and the energy efficiency of the battery.

Finally, environmental application will be considered from the point of view of electromicrobiology [3]. On that topic, we recently developed an original approach to connect bacteria to the electrode surface, allowing us to study electron transfer reactions with bacteria. The method provides a great opportunity to explore a large variety of microbial catalysts for biocathodic processes (e.g., denitrification, bio-hydrogen production, CO2 reduction).

The discussion of these three examples gives the opportunity to draw a continuum between surface active groups on carbon, molecular catalyst, enzymes and microbes to promote more efficient electron transfer reactions in targeted applications having a high social impact.

References:

[1] L. Zhang, M. Etienne, N. Vilà, T.X.H. Le, G.-W. Kohring, A. Walcarius, Electrocatalytic Biosynthesis using a Bucky Paper Functionalized by [Cp*Rh(bpy)Cl] + and a Renewable Enzymatic Layer, ChemCatChem. 10 (2018) 4067–4073. doi:10.1002/cctc.201800681.

[2] M. Etienne, J.F. Vivo-Vilches, I. Vakulko, C. Genois, L. Liu, M. Perdicakis, et al., Layer-by-Layer modification of graphite felt with MWCNT for vanadium redox flow battery, Electrochim. Acta. (2019).

S. Pinck, F.P.A. Jorand, M. Xu, M. Etienne, Protamine Promotes Direct Electron Transfer Between Shewanella oneidensis Cells and Carbon Nanomaterials in Bacterial Biocomposites, ChemElectroChem. (2019). doi:10.1002/celc.201801751.