期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 33, 页码 18927-18934出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b04894
关键词
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资金
- U.S. National Science Foundation [NSF-CBET-0931587]
Intensive effort has led to numerous breakthroughs for photo-processes. So far, however, energy conversion efficiency for the visible-light photocatalytic splitting of water is still very low. In this paper, we demonstrate (1) surface-diffuse-reflected-light can be 2 orders of magnitude more efficient than incident light for photo catalysis, (2) the inefficiency of absorbed visible light for the photocatalytic H-2 production from water with a sacrificial agent is due to its kinetic limitation, and (3) the dispersion of black Pt/TiO2 catalyst on the light-diffuse-reflection-surface of a SiO2 substrate provides a possibility for exploiting a temperature higher than H2O boiling point to overcome the kinetic limitation of visible light photocatalytic hydrogen production. Those findings create a novel temperature-induced visible light photocatalytic H-2 production from water steam with a sacrificial agent, which exhibits a high photohydrogen yield of 497 mmol/h/gcat with a large apparent quantum efficiency (QE) of 65.7% for entire visible light range at 280 degrees C. The QE and yield are one and 2 orders of magnitude larger than most reported results, respectively.
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