Chanyeon Kim

Daegu Gyeongbuk Institute of Science and Technology | DGIST

Use of solar irradiance to drive CO 2 reduction (CO 2 R) holds great promise for the sustainable generation of energy-dense fuels and chemicals, especially as it relates well to carbon capture technology. Multicarbon (C 2+ ) products ( e.g. , ethylene, ethanol, propanol) are particularly attractive because they have a large market size and can be f...

Photoelectrochemical carbon-dioxide reduction (PEC CO2R) is a potentially attractive means for producing chemicals and fuels using sunlight, water, and carbon dioxide; however, this technology is in its infancy. To date,...

ConspectusThe electrochemical reduction of carbon dioxide (CO2R) driven by renewably generated electricity (e.g., solar and wind) offers a promising means for reusing the CO2 released during the production of cement, steel, and aluminum as well as the production of ammonia and methanol. If CO2 could be removed from the atmosphere at acceptable cost...

Electrochemical carbon dioxide reduction (CO2R) provides a promising pathway for sustainable generation of fuels and chemicals. Copper (Cu) electrocatalysts catalyse CO2R to valuable multicarbon (C2+) products, but their selectivity depends on the local microenvironment near the catalyst surface. Here we systematically explore and optimize this mic...

Pulsed electrolysis has been demonstrated to improve the faradaic efficiency (FE) to C2+ products during the electrochemical reduction of CO2 over a Cu catalyst, but the nature of this enhancement is poorly understood. Herein, we developed a time-dependent continuum model of pulsed CO2 electrolysis on Cu in 0.1 M CsHCO3 that faithfully represents t...

We report the results of experimental and theoretical studies aimed at developing a detailed understanding of how pulsed electrolysis alters the production of the temporal evolution of products over Cu and in particular increases the formation of C2+ products. The catalyst is a Cu film sputtered onto the surface of a PTFE membrane, through which th...

We report gas-phase photocatalytic CO2 reduction with Cu2O/TiO2 photocatalysts of varying surface passivation. With taurine adsorbed on photocatalyst surface, CH4 production rate increases and CO production rate decreases, compared to photocatalysts with no ligand treatment. When ethylenediamine is present on Cu2O/TiO2 photocatalysts, CO selectivit...

The electrochemical CO2 reduction is typically operated under highly refined electrolyte conditions. However, trace amounts of metal impurities exist even in ultrapure electrolyte solutions, which cause a fatal deactivation of the catalysts. To address this issue, various efforts have been made to prevent the harmful deposition of metal impurities...

Electrochemical conversion of CO2 and water to valuable chemicals and fuels is one of the promising alternatives to replace fossil fuel-based processes in realizing a carbon–neutral cycle. For practical application of such technologies, suppressing hydrogen evolution reaction and facilitating the activation of stable CO2 molecules still remain majo...

Many heterogeneous catalytic reactions occur at high temperatures, which may cause large energy costs, poor safety, and thermal degradation of catalysts. Here, we propose a light-assisted surface reaction, which catalyze the surface reaction using both light and heat as an energy source. Conventional metal catalysts such as ruthenium, rhodium, plat...

Surface catalytic reactions typically occur on metal nanoparticles deposited on inert supports with high surface area. Recently, many studies have been reported that the catalytic activity of metal nanoparticles can be enhanced significantly under light irradiation. This ‘light-assisted surface reaction’ can lower reaction temperature, potentially...

Plasmonic metal nanoparticles absorb light energy and release the energy through radiative or non-radiative channels. Surface catalytic reaction would take advantage of the non-radiative energy relaxation of plasmon with enhanced activity. Particularly, binary nanoparticles are interesting because diverse integration would be possible consisting of...

Ni nanoparticles were synthesized by a colloidal method in the presence of organic surface-capping agents and used to catalyze the selective hydrogenation of unsaturated furanic aldehydes to furanic alcohols. The effects of the Ni nanoparticle size and surface organic layer were evaluated. Of the 3.7, 5.1, 6.8, and 10.4 nm Ni nanoparticles tested i...

Dry reforming of methane (DRM) reaction is an interesting and promising way to convert CO2 into valuable chemicals. Various metals have been investigated as active sites for the DRM reaction, and particularly, precious metals have been known to be active without severe coke formation. In this work, we showed that a very small amount of Ru (0.13 wt%...

Shaped Ir-Ni bimetallic nanoparticles were synthesized and used for electrocatalytic oxygen evolution reaction (OER). The obtained bimetallic nanoparticles showed significantly enhanced Ir mass activity and durability compared with Ir nanoparticles.

Ag-Ni binary nanoparticles with different shapes of snowman and core-shell are synthesized by modulating the lattice strain. In catalytic hydrogenation of 4-nitrophenol, significant enhancement of the reaction rate was observed for the snowman shape in comparison with the core-shell shape under light irradiation.

Hourglass-shaped Ni nanoparticles were synthesized with a hexagonal close packed (hcp) structure. The unconventional crystalline structure could be stabilized by intensive utilization of hexadecylamine. The dense organic layer on the surface protected the meta-stable crystalline structure.

Nickel catalysts are typically used for hydrogen production by reforming reactions. Reforming methane with carbon dioxide, called dry reforming of methane (DRM), is a good way to produce hydrogen or syngas (a mixture of hydrogen and carbon monoxide) from two notable greenhouse gases. However, Ni catalysts used for DRM suffer from severe coke deposi...