增强PbS和CdS量子点敏化的TiO₂纳米棒阵列在紫外-可见光下的光电化学产氢活性和稳定性。
Enhance photoelectrochemical hydrogen-generation activity and stability of TiO2 nanorod arrays sensitized by PbS and CdS quantum dots under UV-visible light.
作者信息
Li Lei, Dai Haitao, Feng Liefeng, Luo Dan, Wang Shuguo, Sun Xiaowei
机构信息
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin University, Tianjin, 300072, China.
Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen, 518055, China.
出版信息
Nanoscale Res Lett. 2015 Dec;10(1):418. doi: 10.1186/s11671-015-1129-3. Epub 2015 Oct 26.
We develop a composite photoanode by sensitizing TiO2 nanorod arrays with PbS quantum dots (QDs) and CdS QDs. Benefitted from additional introduced PbS QDs and CdS QDs onto TiO2, the absorption of the composite photoanodes are broaden from UV to visible region. The experimental results showed that the PbS sandwiched between TiO2 and CdS cannot only broad the absorption properties but also improve the stability. The stability can be explained by the hole facile transmission from PbS to CdS because of the valence band offsets between PbS and CdS which cause a small energy barrier and reduce the hole accumulation. The photocurrent density reached 1.35 mA cm(-2) at 0.9716 V vs. RHE (0 V vs. Ag/AgCl, under 60 mW cm(-2) illumination) for TiO2/PbS/CdS. The highest photocurrent of TiO2/PbS/CdS can be explained by the smallest of total resistance (138 Ω cm(-2)) compared to TiO2/CdS and pristine TiO2.
我们通过用硫化铅量子点（QDs）和硫化镉量子点敏化二氧化钛纳米棒阵列来制备复合光阳极。得益于在二氧化钛上额外引入的硫化铅量子点和硫化镉量子点，复合光阳极的吸收范围从紫外区域拓宽到了可见光区域。实验结果表明，夹在二氧化钛和硫化镉之间的硫化铅不仅能拓宽吸收特性，还能提高稳定性。这种稳定性可以通过硫化铅和硫化镉之间的价带偏移导致的小能量势垒以及空穴从硫化铅到硫化镉的容易传输来解释，这减少了空穴积累。在0.9716 V（相对于可逆氢电极，0 V相对于银/氯化银，在60 mW cm(-2)光照下）时，二氧化钛/硫化铅/硫化镉的光电流密度达到1.35 mA cm(-2)。与二氧化钛/硫化镉和原始二氧化钛相比，二氧化钛/硫化铅/硫化镉的最高光电流可以通过最小的总电阻（138 Ω cm(-2)）来解释。
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