Efficient photochemical water splitting by a chemically modified n-TiO2 2
Efficient photochemical water splitting by a chemically modified n-TiO2 2
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DOI：
10.1126/science.1075035
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发表时间：
2002-09-27
期刊：
影响因子：
56.9
通讯作者：
Ingler, WB
中科院分区：
文献类型：
--
作者：
Khan, SUM;Al-Shahry, M;Ingler, WB
尽管n型二氧化钛(Ti02)是一种很有前途的从水中光产氢的衬底，但大多数对这种材料进行掺杂以使其在太阳光谱的可见光区域吸收光的尝试都取得了有限的成功。我们利用金属钛在天然气火焰中的控制燃烧合成了化学改性的n型二氧化钛。这种材料，其中碳取代了一些晶格氧原子，吸收波长低于纳米的光，并且具有比金红石更低的带隙能量(2.32比3.00电子伏)。在0.3伏的外加电压下，化学改性的n型二氧化钛在40毫瓦/平方厘米的光照下进行了水的分解，总转化效率为11%，最大光转化效率为8.35%。后者的值与偏置在0.6伏的n型二氧化钛的最大光转换效率1%相比是有利的。
Although n-type titanium dioxide (TiO2) is a promising substrate for photogeneration of hydrogen from water, most attempts at doping this material so that it absorbs light in the visible region of the solar spectrum have met with limited success. We synthesized a chemically modified n-type TiO2 by controlled combustion of Ti metal in a natural gas flame. This material, in which carbon substitutes for some of the lattice oxygen atoms, absorbs light at wavelengths below 535 nanometers and has a lower band-gap energy than rutile (2.32 versus 3.00 electron volts). At an applied potential of 0.3 volt, chemically modified n-type TiO2 performs water splitting with a total conversion efficiency of 11% and a maximum photoconversion efficiency of 8.35% when illuminated at 40 milliwatts per square centimeter. The latter value compares favorably with a maximum photoconversion efficiency of 1% for n-type TiO2 biased at 0.6 volt.