Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 142, Issue -, Pages 626-632Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2013.05.073
Keywords
p-n diode-type photocatalyst; CoOx/TiO2 nanocomposite; Nonaqueous synthesis; Photocatalytic hydrogen production
Funding
- National Science Council of Taiwan [NSC101-2628-M-007-001-MY2, NSC101-3113-P-008-001]
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This paper describes a nonaqueous sol-gel preparation of p-n diode-type CoOx/TiO2 nanocomposites for photocatalytic hydrogen generation. Characterization results suggested that the nanocomposites consisted of highly crystalline anatase nanoparticles and Co3O4-like species. They showed composition-dependent activity for hydrogen production under ultraviolet light irradiation with methanol as a sacrificial agent. The nanocomposite with the optimum composition exhibited superior photocatalytic activity and a hydrogen evolution rate of 2.17 mmol g(-1) h(-1). In comparison, the hydrogen evolution rates for the reference photocatalysts Degussa P25 and sodium tantalite measured under the same conditions were 20 mu mol g(-1) and 410 mu mol g(-1), respectively. The stability and the concentration-dependent hydrogen production with methanol or ethanol as sacrificial agent were also studied. In addition, the nanocomposite was capable of producing hydrogen, albeit in small amount, in the sacrificial agent-free conditions in the phosphate-buffered solutions. The results show not only the uniqueness of the nonaqueous synthesis for highly active CoOx/TiO2 heterojunction photocatalysts, but also the possibility to further improve the photocatalytic activity of CoOx/TiO2 through surface engineering. (c) 2013 Elsevier B.V. All rights reserved.
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