Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
The reduction of CO2 to useful aliphatic compounds is a promising technology to establish a carbon recycle society. Although electrochemical CO2 reduction has not been established, the electrochemical reduction has been considered to be an attracting technique due to its possibility of mass production and C-C double bond formation. Well-known cathode material to generate aliphatic compounds is Cu. However, the Cu cathode has problems of not only produced material non-controllability but also the time-dependent change of the product ratio. This time-dependent behavior is believed to be an indication of the change of their reaction environments especially at the interface of the KHCO3 aqueous electrolyte and Cu cathode. In-situ acquisition of Raman spectra is expected to evaluate this changing of the interface structure.
The in-situ Raman observation of the long-time and real current density operation of a Cu electrode is difficult because the operation is usually performed in a micro-Raman system. That is, the reactor for the micro Raman system is required to be able to operate under the objective lens in the optical microscope. Reproducing the real reaction circumstances for the micro Raman system is difficult due to the space limitation. In this study, the conventional Raman system was used in order to be set close to the real operation condition. As a result, the long time and real current density operation were available even under the Raman observation.
Conventional Cu cathodes without pre-treatment were evaluated by the conventional Raman system. It is reported that Cu oxides rapidly reduced to metallic Cu due to the strong reduced condition (around -1.5 to -1.6 V vs Ag/AgCl at pH 6 to 7) [1,2]. The Raman peak at 525 cm-1 assigned as Cu2O was clearly observed during the electrochemical reduced reaction in the present study. The peak at 525 cm-1 was observed after 210 min from the reduction started for one of the samples, and the peak was observed from the beginning for the other sample. These results probably show the Cu surface is very sensitive to the starting surface conditions.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.