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Design and engineering of photoelectrode materials for photoelectrochemical water splitting
( Rami Reddy Boppella ),김동하 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Photoelectrochemical (PEC) cell is the one most elegant, practical and potentially more efficient route to convert the solar energy to stored chemical energy through the splitting of raw water into molecular oxygen and hydrogen. In this regard, various semiconductor metal oxides including TiO2, Fe2O3, WO3 and BiVO4 gained much attention as a photoelectrode material for H2 production. However, most of these metal oxides do not meet the optoelectronic properties that lead to both low light harvesting efficiencies and required large over potential to drive water oxidation. Therefore developing new robust energy materials that can efficiently harvest a large portion of the solar spectrum with better charge transporting properties is an ultimate challenge nowadays.In this perspective, our present research efforts devoted not only designing photoelectrode materials with high photocurrent but also reducing the over potential with surface treatments. In addition, the primary goal of our research is to fabricate an efficient photoelectrochemical water splitting device (PEC) that can split water directly on semiconductor surface without requiring over potential to realize the means of “The need for clean energy”.
김지현,임주원,이지은,( Rami Reddy Boppella ),김희준,장유진,김동하 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Transparent conductive electrodes (TCE) are widely utilized in optoelectronic devices. The commercial material for TCEs is indium-tin-oxide (ITO), but it has critical drawbacks: brittleness, scarcity of indium resources, a high-cost low-throughput process of ITO deposition. In this respect, copper nanowires (CuNWs) are proposed as excellent alternatives since Cu is less expensive and more abundant, compared to indium. Moreover, they are solution-processible with the possibility of flexible device application. To overcome the susceptibility to rapid oxidation of CuNWs, we developed highly stable metal alloy NW based TCEs capped with reduced graphene oxide (rGO). CuNWs are covered with Ag nanoparticles by galvanic displacement reaction to prevent Cu surface from oxidation in air. Further, thermal stability and electrical conductivity of Cu-Ag alloy NWs were enhanced by introducing rGO. Finally, we seek the potential of these advanced TCEs in optoelectronic devices.