Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 6, Pages 3791-3796Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am508738d
Keywords
TiO2 nanorod arrays; surface disordered layer; electrochemical reduction; water splitting; charge injection efficiency
Funding
- 973 National Basic Research Program of the Ministry of Science and Technology [2014CB239403]
- National Natural Science Foundation of China [21373209]
- Fundamental Research Funds for the Central Universities [HIT. KISTP. 201406]
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The recent discovery of colored TiO2 indicated that the disordered surface layer over the TiO2 particles/photoelectrodes is beneficial for higher photocatalytic performance; however, the role of the disordered surface TiO2 layer is not well understood. Here, we report an electrochemical strategy for tuning the surface structure of TiO2 nanorod arrays (NRAs) and try to understand the role of the disordered surface TiO2 layer. Photoelectrodes of TiO2 NRAs with a disordered shell were prepared by an electrochemical reduction method. The photocurrent of the NRAs with a disordered shell can reach as high as similar to 1.18 mA/cm(2) at 1.23 V, which is 2.2 times of that of the pristine TiO2 NRAs. Our results show that the surface disordered layer not only improves the bulk charge separation but also suppresses the charge recombination at the electrode/electrolyte interface, acting as an efficient water oxidation cocatalyst of photoelectrochemical cell for solar water splitting.
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