Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.123
Publication date: 18th July 2023
Electrochemical CO2 reduction is a candidate for reduced CO2 concentration in the atmosphere and changes to usable compounds. Zero-gap reactor for CO2 reduction is expected to realization due to its low applied voltage and high current density.
The zero-gap reactor for CO2 reduction requires an anion exchange membrane and an anolyte. These requirements are different from the polymer electrolyte electrochemical cell for water electrolysis. Although the membrane is an anion exchange, cations in anolyte pass through from anode to cathode. The existence of a cation in the cathode is also known to be essential for CO2 reduction, thus, the cation in the cathode has a possibility to affect the properties of CO2 reduction. This report discusses the effects of the anolyte of KHCO3 concentration.
The KHCO3 concentration was 0.01, 0.1, and 1.0 mol/L, the catalysts of the cathode for CO2 reduction and the anode for water oxidation were Cu and IrOx, respectively. The electrode area was 5 cm2. Since the catalyst for the cathode was Cu, the products in the cathode were mainly CO, CH4, and C2H4, with the satellite reaction product of H2 from water reduction.
The applied voltage under a constant current density of 200 mA/cm2 was lowest at the KHCO3 concentration of 1.0 mol/L. The maximum faradaic efficiencies of C2H4 around 35% were obtained at 4.2, 3.6, and 3.2 V for 0.01, 0.1, and 1.0 mol/L, respectively. From these results, the higher anolyte concentration shows the lower applied voltage at the same current density and at the highest faradaic efficiency of C2H4. The reliability was, however, the best at the concentration of 0.1 mol/L because the CO2 gas flow was strangled by the precipitation of the salt at 1.0 mol/L and the current density increased at 0.01 mol/L. The anolyte concentration affects the CO2 reduction and the 0.1 mol/L KHCO3 was the best considering all the results.
This work is partially based on results obtained from a project subsidized by the New Energy and Industrial Technology Development Organization (NEDO) Grant No. 20001627-0.
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.