期刊
CHEMISTRY OF MATERIALS
卷 25, 期 2, 页码 184-189出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm303206s
关键词
photoelectrochemical cell; hydrogen generation; ZnO nanowire; cadmium chalcogenide
资金
- National Research Foundation [NRF2010-0009545]
- Korean Government (MOEHRD) [KRF-2008-005-J00501]
- Hydrogen Energy RD Center
- MEST through the National Research Foundation of Korea [NRF-2009-C1AAA001-2009-0093879]
- Korea Research Foundation
- Korea Center for Artificial Photosynthesis (KCAP)
- National Research Foundation of Korea [2010-0009545, 2009-0094036, 2009-0093880] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although cadmium chalcogenide quantum dot-sensitized photoanode can utilize the whole visible region of the solar spectrum, its poor photochemical stability owing to hole-induced anodic corrosion remains a major problem for the application in photoelectrochemical hydrogen generation systems. Here, modification with IrOx center dot nH(2)O, a well-known water-oxidation catalyst substantially improves the photochemical stability of the quantum dot-sensitized photoanode. Moreover, it induces an increased photocurrent and a cathodic shift of the onset potential. This is the first example that an oxygen-evolution catalyst is employed on a quantum dot-sensitized electrode system, and it shows 13.9 mA cm(-2) (at 0.6 V) and -0.277 V vs the reversible hydrogen electrode (RHE), which are the highest photocurrent density and the lowest onset potential attained with a ZnO-based electrode, respectively. An average hydrogen evolution rate of 240 mu mol h(-1) cm(-2) at 0.6 V vs RHE has been achieved on a IrOx center dot nH(2)O efficiency. modified electrode, with almost 100% of faradaic
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