Yong Wook Kim

Here, we detail how the catalytic behavior of immobilized molecular electrocatalysts for the CO 2 reduction reaction (CO 2 RR) can be impacted by catalyst aggregation. Operando Raman spectroscopy was used to study the CO 2 RR mediated by a layer of cobalt phthalocyanine (CoPc) immobilized on the cathode of an electrochemical flow reactor. We demonstrate that during electrolysis, the oxidation state of CoPc in the catalyst layer is dependent upon the degree of catalyst aggregation. Our data indic

Electrospinning was used to create custom-made fibrous electrode materials for redox flow batteries with targeted structural properties. The aim was to increase the available surface area for electrochemical reaction without diminishing the transport properties of the electrode. Electrospinning conditions were identified that could produce fibers several times larger than those typically yielded by the technique, yet much smaller than in commercially available electrodes. These materials were su

Conspectus The electrochemical reduction of carbon dioxide (CO2RR) is a promising strategy for mitigating global CO 2 emissions while simultaneously yielding valuable chemicals and fuels, such as CO, HCOO –, and C 2 H 4 . This approach becomes especially appealing when integrated with surplus renewable electricity, as the ensuing production of fuels could facilitate the closure of the carbon cycle. Despite these advantages, the realization of industrial-scale electrolyzers fed with CO 2 will be

The highest performing cathodes for CO2 electrolyzers are porous and exhibit high specific surface areas that serve to increase the density of CO2 reduction catalyst sites. While porous electrodes increase CO2 reduction activity, their high surface area can negatively impact the mass transport of products and reactants at high current densities (i.e., >100 mA cm–2). We demonstrate here the trade-off between the density of CO2 reduction catalyst sites (specific surface area) and mass transport (p

The capture of CO 2 using alkaline solutions requires significant thermal energy to release CO 2 from a (bi)carbonate-enriched solution. This release of CO 2 can instead be performed electrochemically with a “bicarbonate electrolyzer”. The bicarbonate electrolyzer forms acid equivalents to convert a (bi)carbonate-enriched eluent from a CO 2 capture unit into CO 2 and, in turn, an upgraded carbon product such as CO and ethylene. There exists a tension for this closed-loop cycle to be put into pra

Purpose: This study was aimed to evaluate the brain metabolism in patients with subcortical aphasia after intracerebral hemorrhage (ICH) and the relationship between the severity of aphasia and regional brain metabolism, by using statistical mapping analysis of F-18 fluorodeoxyglucose positron emission tomography (F-18 FDG PET) images. Materials and Methods: Sixteen right-handed Korean speaking patients with subcortical aphasia following ICH were enrolled. All patients underwent Korean version o

Purpose: To assess the effect of extracorporeal shock wave therapy (ESWT) for healthy participants with hamstring tightness. Materials and Methods: This study was performed at a university rehabilitation hospital. Twenty nine healthy adults with hamstringtightness were enrolled and randomly allocated into four groups (ESWT, stretching exercise, ESWT with stretching exercise, and control). The effects of individual treatments were compared by the finger-to-floor test and popliteal angle. Results:

For waste CO2 to be electrolytically converted into higher-value chemicals and fuels, electrolyzers that drive the CO2 reduction reaction need to be integrated with upstream CO2 capture units. However, this has not yet been demonstrated because of the large operational gap for the capture and conversion steps. Here, we report a coupled carbon reactor that captures and converts CO2 into syngas with a 1.7:1 ratio of H2 to CO. The resulting syngas can be utilized in the production of a wide range o

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