동완재 교수

Hybrid materials consisting of semiconductors and cocatalysts have been widely used for photoelectrochemical (PEC) conversion of CO₂ gas to value-added chemicals such as formic acid (HCOOH). To date, however, the rational design of catalytic architecture enabling the reduction of <i>real</i> CO₂ gas to chemical has remained a grand challenge. Here, we report a unique photocathode consisting of CuS-decorated GaN nanowires (NWs) integrated on planar silicon (Si) for the conve

Abstract Seawater electrolysis provides a viable method to produce clean hydrogen fuel. To date, however, the realization of high performance photocathodes for seawater hydrogen evolution reaction has remained challenging. Here, we introduce n + -p Si photocathodes with dramatically improved activity and stability for hydrogen evolution reaction in seawater, modified by Pt nanoclusters anchored on GaN nanowires. We find that Pt-Ga sites at the Pt/GaN interface promote the dissociation of water m

Nanostructured metal catalysts to convert CO 2 to formate, which have been extensively studied over decades, have many problems such as durability, lifetime, high process temperature, and difficulty in controlling the morphology of nanostructures. Here, we report a facile method to fabricate monolithic nanoporous In–Sn alloy, a network of nanopores, induced by electroreduction of indium tin oxide nanobranches (ITO BRs). The electroreduction process concentrated a local electric field at the tip

The electrochemical CO₂ reduction in aqueous media is a promising method for both the mitigation of climate changes and the generation of value-added fuels. Although many researchers have demonstrated selective and stable catalysts for electrochemical reduction of pure CO₂ gas, the conversion of industrial CO₂ gas has been limited. Here, we fabricated the copper sulfide catalysts (CuS_<i>x</i>), which were spontaneously formed by dipping a Cu foil into

We investigated the relationship between grain boundary (GB) oxidation of Cu-Ag thin-film catalysts and selectivity of the (photo)electrochemical CO₂ reduction reaction (CO₂ RR). The change in the thickness of the Cu thin film accompanies the variation of GB density, and the Ag layer (3 nm) has an island-like morphology on the Cu thin film. Therefore, oxygen from ambient air penetrates into the Cu thin film through the GB of Cu and binds with it because the uncoordinated Cu

Bi catalysts supported on GaN nanowires/Si photocathode induce favorable activity toward CO 2 reduction to HCOOH.

Photocathodes consisting of semiconductors and cocatalysts have demonstrated promising performances for the solar-driven CO2 reduction reaction (CO2 RR) and the H2 evolution reaction. However, the performance of cocatalyst materials has been limited due to the degradation of semiconductors during the loading processes. Hence, a photocathode that withstands harsh reaction conditions can broaden the selection of cocatalyst materials and improve catalytic activity. Here, we have developed Ag halide

Abstract Large‐scale industrial application of solar‐driven water splitting has called for the development of oxygen evolution reaction (OER) catalysts that deliver high catalytic activity and stability. Here it is shown that an efficient OER catalytic substrate can be developed by roll‐to‐roll fabrication of electrodeposited Ni‐Fe foils, followed by anodization. An amorphous oxyhydroxide layer directly formed on Ni‐Fe foils exhibits high catalytic activity toward water oxidation in 1 m KOH solu

The electrochemical carbon dioxide (CO2) reduction is a promising method for carbon recycling. Bimetallic catalysts have been extensively developed for the selective production of carbon monoxide (CO) and formate (HCOOH), while efforts to understand the change in structure and composition under reaction conditions have been limited. Here, we provided experimental evidence for the local corrosion phenomenon of bimetallic Cu–Sn catalysts through the patterning of the Sn layer on Cu foil (Cu/p-Sn).

H_yMoO_3−xhas been synthesized by photon irradiation, and acts as an efficient hole transport layer in flexible organic solar cells.

Semiconductor photoelectrodes can be used to synthesize urea from carbon dioxide and nitrate under solar light. We find that GaN nanowires (NWs) have inherent catalytic activity for nitrate conversion to nitrite, while Ag cocatalysts loaded onto GaN NWs further promote the performance of photoelectrochemical urea synthesis. Under optimized conditions, a high faradaic efficiency of 75.6 ± 2.6% was achieved at a potential of −0.3 vs reversible hydrogen electrode. Control experiments and theoretica

Abstract Photoelectrochemical water splitting is a promising technique for converting solar energy into low‐cost and eco‐friendly H 2 fuel. However, the production rate of H 2 is limited by the insufficient number of photogenerated charge carriers in the conventional photoelectrodes under 1 sun (100 mW cm −2 ) light. Concentrated solar light irradiation can overcome the issue of low yield, but it leads to a new challenge of stability because the accelerated reaction alters the surface chemical c