期刊
NANO LETTERS
卷 11, 期 11, 页码 4978-4984出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl2029392
关键词
TiO2; nanorods; branched nanorods; photoanode; photoelectrochemical hydrogen production; charge transport/transfer
类别
资金
- Center on Nanostructuring for Efficient Energy Conversion, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001060]
- National Research Foundation of Korea
- Korean Government (Ministry of Education, Science and Technology) [NRF-2010-357-D00126]
- U.S. DOE Office of Energy Efficiency and Renewable Energy [NFT-9-88567-01, DE-AC36-08GO28308]
- Link Foundation
- National Research Foundation of Korea [357-2010-1-D00126] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report a hierarchically branched TiO2 nanorod structure that serves as a model architecture for efficient photoelectrochemical devices as it simultaneously offers a large contact area with the electrolyte, excellent light-trapping characteristics,, and a highly conductive pathway for charge carrier collection. Under Xenon lamp illumination (UV spectrum matched to AM 1.5G, 88 mW/cm(2) total power density), the branched TiO2 nanorod array produces a photocurrent density of 0.83 mA/cm(2) at 0.8 V versus reversible hydrogen electrode (RHE). The incident photon-to-current conversion efficiency reaches 67% at 380 nm with an applied bias of 0.6 V versus RHE, nearly two times higher than the bare nanorods without branches. The branches improve efficiency by means of (0 improved charge separation. and transport within the branches due to their small diameters, and (ii) a 4-fold increase in surface area which facilitates the hole transfer at the TiO2/electrolyte interface.
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