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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Novel H:ZnO Nanorods based Photoanode Sensitized by CdS and Carbon Quantum Dots for Photoelectrochemical Water Splitting

2015년 9월 3일 09시 58분 53초
ENVR.P-552 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (목요일) 11:00~12:30
저자 및
Nguyen Minh Vuong, Logan Reynolds1, Eric Conte1, 이용일*
창원대학교 화학과, Korea
1Western Kentucky University, Korea
※ 국외소속으로 등록된 저자의 승인여부는 최소 3일이내 발표자 email로 알려드립니다.
승인 2건
We report a promising simple strategy to improve the performance of photoanode for photoelectrochemical (PEC) water splitting. ZnO nanorods on ITO glass substrate were synthesized by hydrothermal method following calcinations in air at 500 ?C for 2 hours and pure hydrogen ambient at atmosphere pressure at 400 ?C for 30 min. Hydrogenated ZnO (H:ZnO) sample shows enhanced photocurrent in comparison to ZnO nanorods. To enhance the absorption in the visible light and near-IR regions, H:ZnO nanorods were sensitized by cadmium sulfide (CdS) nanoparticles and carbon quantum dots (CQDs). The CdS and CQDs sensitized H:ZnO nanorod film exhibited significantly improved PEC property after treatment in nitrogen ambient at 400 ℃ for 30 min. The optimized CdS and CQDs sensitized H:ZnO nanorod sample yields a photocurrent density of ∼12.82 mA/cm2 at 0 V (vs. SCE) in 0.25 M Na2S and 0.35 Na2SO3 solution under the illumination of simulated solar light (100 mW/cm2 from 150 W xenon Arc lamp source). The optimal structure shows a solar-to-hydrogen (STH) conversion efficiency of ∼3.85 % (at -0.67 V vs. SCE). The H2 gas generation using this optimal CdS and CQDs sensitized H:ZnO nanorods structure was obtained with 7.04 ml/cm2 in 1 hour. The morphology and property of samples were examined by SEM, XRD, TEM, UV-vis absorption and electrical measurement.