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이호영,임한이,최준혁,박종혁,이지혜 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.05
Photoelectrochemical (PEC) water splitting is a promising method of converting solar energy to chemical energy. Recently, research to improve the efficiency and stability of large-area photoelectrodes has attracted attention. Tungsten trioxide (WO₃) has excellent charge transport properties and bismuth vanadate (BiVO₄) has a narrow optical band gap and a band edge position suitable for water oxidation. In order to improve PEC performance, BiVO₄ and WO₃ are used as a heterojunction. In particular, BiVO₄/WO₃ nanorods overcome limitation of the short carrier diffusion length of BiVO₄ by using a one-dimensional nanostructure. In addition, it has been proven that the plasmonic effect generated by the introduction of gold nanoparticles (AuNP) promotes PEC performance. Many studies including above research have been reported to improve the efficiency of photoelectrodes. However, studies on small area photoelectrode still mainly conducted, thus a study on large area photoelectrode is required. In this study, large-area vertical array BiVO₄/WO₃ nanorods through nanoimprint lithography were uniformly and easily fabricated. Periodically aligned BiVO₄/WO₃ nanorods exhibited better PEC performance than randomly grown nanorods and planar films owing to increased light absorption and charge separation. The introduction of the AuNPs further enhanced the PEC performance by synergizing with periodically aligned BiVO₄/WO₃ nanorods.
Fabrication of IrxTa100xOy as counter electrodes in saline water
이나연,임한서,이수민,이현주,최현승,임성열 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.1
One of the key challenges to realize electrolysis of seawater is to develop highly active and stable electrocatalysts in oxygen evolution reaction (OER). This is crucial even for the development of electrocatalysts for hydrogen evolu- tion reaction (HER) using three-electrode configuration because damaged sur- faces of counter electrodes (CEs), which exposed to electrochemical oxidative environments often limit the performance of cathodes in working electrodes (WEs) by lowering the electrical conductivity and poisoning the surface of elec- trocatalysts. Herein, we demonstrate the use of IrxTa100xOy as a CE in simu- lated seawater. IrxTa100xOy-coated electrodes as CEs with optimized Ir:Ta ratios enable the high-valence states of Ir for improving activity and selectivity toward the OER. Moreover, the IrxTa100xOy CEs ensure unhindered electro- chemical performance of Pt for HER in contrast to carbon-based materials, thus highlighting their reliability as a CE.