Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Following the lead of natural photosynthesis, CO2 reduction combined with water oxidation is a promising route to mitigate CO2 emission. Shining light onto the mechanism and especially the intermediates involved in the electrochemical CO2 reduction reactions is an important step for the development of outstanding catalysts. Here, we adopted operando Raman spectroscopy to investigate the reaction mechanism. The Cu foam employed for this study is an effective SERS active substrate, easily electrodeposited, with no need for further surface modifications.[1] We found that the raw data is dominated by a strong background which is heavily dependent on the electrochemical potential and the chemical state of the Cu surface. We suggest that appropriate subtraction of a higher polynomial function and additional suitable normalization of the data is necessary before any interpretation of peak/intensity trends can be derived from the operando Raman data. Surface oxides and hydroxides are present on the Cu foam and gradually disappear until -0.4 VRHE, and only metallic Cu is present at catalytically relevant potentials. Analysis of potential dependent intensity trends of the intramolecular CO and Cu-CO bands suggested a fully reversible behavior of *CO adsorption/desorption showing a hysteresis. Two distinct vibration modes of *CO adsorption were observed as a broad intramolecular CO band (present at potentials lower than -0.2 VRHE) and a sharp band at higher frequency at catalytically relevant potentials (negative than -0.6 VRHE). Carbonate bands were detectable, but with strong dependence on the preceding potential sequences. Various C-H bonds related to either intermediates or products are observed and tend to accumulate on the surface. Further investigation is required for assignment to specific species.
[1] Klingan, K; Kottakkat, T; Jovanov, ZP; Jiang, S; Pasquini, C; Scholten, F; et al. Reactivity Determinants in Electrodeposited Cu Foams for Electrochemical CO2 Reduction. ChemSusChem. 2018, in press.
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.