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Electrochemical Carbon Dioxide Reduction at Copper Electrodes : Online Gas Chromatographic Analysis of Volatile Products

Title data

Engelbrecht, Andreas ; Hämmerle, Martin ; Moos, Ralf ; Fleischer, Maximilian ; Schmid, Günter:
Electrochemical Carbon Dioxide Reduction at Copper Electrodes : Online Gas Chromatographic Analysis of Volatile Products.
2014
Event: Electrochemistry 2014 , 22.-24.09.2014 , Mainz, Germany.
(Conference item: Conference , Other Presentation type)

Abstract in another language

Due to the expansion of renewable energy sources, large amounts of energy areavailable at peak energy production periods. Until now, this excess energy cannot be stored efficiently with common methods such as pumped storage hydro power stations or batteries. A promising possibility to store electrical energy is the usage of chemical energy storage. For example, carbon dioxide can be electrochemically reduced to hydrocarbons. Previous studies by Hori et al. and other teams proofed the capabilities of various metals, especially copper as electrode materials for this process.

For fundamental studies an electrolytic H-cell with two glass compartments has been set up. The double-walled design allows efficient temperature control of the reactor. The half cells are separated by a Nafion N117 membrane. The CO2 gas passes a glass tube into the electrolyte solution and further on transfers the volatile products to the gas chromatograph. A Luggin capillary allows the positioning of the Ag/AgCl reference electrode close to the working electrode. A platinum coil is used as the counter electrode. The cell is operated via a potentiostat PGSTAT30 from Metrohm. A gas chromatograph Fisher Scientific Trace 1310 was customised for analysis. The current configuration enables the quantification of CO, CH4, and C2Hx using a flame ionisation detector in combination with a methanizer, and the determination of H2 using a thermal conductivity detector. One analysis cycle including the cooling of the oven can be accomplished in less than 6 minutes. Therefore, it is well suited for online analysis.

First potentiostatic electrolysis were carried out with a 0.1 M KHCO3 solution as electrolyte and copper electrodes. The results showed the voltage dependence of the product composition, and confirmed the proper operation of the system.

Further data

Item Type: Conference item (Other)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 11 May 2015 11:39
Last Modified: 15 Apr 2016 07:50
URI: https://eref.uni-bayreuth.de/id/eprint/13164