동완재 교수

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 CO₂ 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 a

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.

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

Photoelectrochemical water splitting is a promising technique for converting solar energy into low-cost and eco-friendly H₂ fuel. However, the production rate of H₂ 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 th

This review describes the recent developments of one-dimensional III-nitride semiconductors and the design strategies for efficient and stable artificial photosynthesis of water splitting and carbon dioxide reduction.

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

We report a photorechargeable supercapacitor that can convert solar energy to chemical energy and store it. The supercapacitor is composed of indium tin oxide branched nanowires (ITO BRs) and poly(3-hexylthiophene) (P3HT) semiconducting polymers. ITO BRs showed electrical double layer capacitive characteristics that originated from the unique porous and self-connected network structure. The hybrid structure of ITO BR/P3HT exhibited spontaneous light harvesting, energy conversion, and charge stor

A distributed Bragg reflector (DBR) is conducted as a bottom reflector in see-through organic photovoltaics (OPVs) with an active layer of poly(3-hexylthiophene) and phenyl-C61-butyric acid methyl ester (P3HT:PCBM). The DBR consists of alternative layers of the high- and low-refractive index materials of Ta2O5 (n = 2.16) and SiO2 (n = 1.46). The DBR selectively reflects the light within a specific wavelength region (490 nm–630 nm) where the absorbance of P3HT:PCBM is maximum. The see-through OPV