Hydrogen production from photocatalytic water splitting via TiO2 and TiO2/CuO thin-film photocatalysts irradiated with visible light- Effects of sacrificial agents

• Main Authors: Bo-Hung Chen, 陳柏宏
• Other Authors: Chung-Hsuang Hung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/y9kvtf

碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程研究所 === 102 === This study aims the n-type and p respectively type semiconductor oxide advantage to construct a complex n-type titanium dioxide and p-type photoelectric copper oxide catalytic splitting reaction of the system for the next phase in the visible light energy, water splitting hydrogen production reaction. In this study, in addition to the simple application of titanium dioxide semiconductor photocatalyst is also preparing TiO2 / CuO composite film photocatalyst,In order to enhance the effectiveness of photocatalytic water splitting hydrogen production. Study by testing different applied voltage, light, and sacrificial reagents such as alcohols may affect the rate of hydrogen production reaction parameters, In addition to basic information on the establishment of relevant specimens water splitting reaction of hydrogen production, but also to take investigate hydrogen production from water splitting visible reaction mechanism. The TiO2 thin film probes were prepared by compositing TiO2 with copper oxides via magnetron sputtering processes. Consists mainly of quartz glass reaction vessel is composed of two closed, are disposed in the photocatalyst electrode and platinum wire counter electrode while a saturated calomel electrode as the reference electrode, and a proton exchange membrane link. Experiment to Na2CO3 solution as the electrolyte, and the light-generated current rate of detection of hydrogen. Further, the light source comprises UV lamp (365nm), LED blue light (470 nm), and the simulated sunlight etc., but also for the use of artificial sunlight filters are respectively filtering a wavelength of 200 ~ 400 nm, 440 ~ 460 nm, 540 ~ 560 nm, over 600 nm and the above specific wavelength range of visible light, prepared to confirm the possibility of visible light photocatalyst in hydrogen production. The results showed that: TiO2 / CuO films prepared photocatalyst electrode, its energy gap of about 1.7 ~ 2.0 eV, has been moved to the visible red range, can also produce a stronger photocurrent; Pure TiO2 and composite TiO2 / CuO photocatalyst, all with good catalytic water splitting hydrogen production photoelectric effect; For pure TiO2 photocatalyst, in the near ultraviolet light, and when the methanol and ethanol, for the sacrificial agent, respectively, and the hydrogen production rate can improve to 2.65 times and 2.8 times; For TiO2 / CuO visible light photocatalyst film in recent ultraviolet light, and the methanol and ethanol were added at the expense of reagents, hydrogen production rate can be increased to 6.27 times and 5.91 times respectively. If the simulated sunlight, you can increase the hydrogen production rate, respectively, to 4.24 times and 4.59 times. Adding methanol and other sacrificial agent to help slow the photocatalyst electron and hole recombination rate, promote the occurrence of hydrogen production reaction; Fastest hydrogen production rate obtained in this study, under UV and simulated sunlight, respectively, can be achieved 5.603×10-6 mole/cm2hr and 5.696×10-6 mole/cm2hr, Photocurrent intensity at this time were 23.02×10-4 A and 28.710×10-4 A; This study verified the composite TiO2 / CuO photocatalyst electrode can be in visible light, smoothly water splitting hydrogen production reactions.