Journal
NANO RESEARCH
Volume 7, Issue 3, Pages 353-364Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-013-0401-7
Keywords
ion implantation; Cu ion doping; ZnO nanorods; photoanode; water splitting
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Funding
- National Natural Science Foundation of China [51102194, 51323011, 51121092]
- Doctoral Program of the Ministry of Education [20110201120040]
- Nano Research Program of Suzhou City [ZXG2013003]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201335]
- Fundamental Research Funds for the Central Universities
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Utilization of visible light is of crucial importance for exploiting efficient semiconductor catalysts for solar water splitting. In this study, an advanced ion implantation method was utilized to dope Cu ions into ZnO nanorod arrays for photoelectrochemical water splitting in visible light. X-ray diffraction (XRD) and X-ray photo-electron spectroscopy (XPS) results revealed that Cu+ together with a small amount of Cu2+ were highly dispersed within the ZnO nanorod arrays. The Cu ion doped ZnO nanorod arrays displayed extended optical absorption and enhanced photoelectrochemical performance under visible light illumination (lambda > 420 nm). A considerable photocurrent density of 18 mu A/cm(2) at 0.8 V (vs. a saturated calomel electrode) was achieved, which was about 11 times higher than that of undoped ZnO nanorod arrays. This study proposes that ion implantation could be an effective approach for developing novel visible-light-driven photocatalytic materials for water splitting.
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