Improved Photoelectrochemical Cell Performance of Tin Oxide with Functionalized Multiwalled Carbon Nanotubes鈥揅admium Selenide Sensitizer

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• 作者：Sambhaji S. Bhande ; Rohan B. Ambade ; Dipak V. Shinde ; Swapnil B. Ambade ; Supriya A. Patil ; Mu. Naushad ; Rajaram S. Mane ; Z. A. Alothman ; Soo-Hyoung Lee ; Sung-Hwan Han
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25094-25104
• 全文大小：1121K
• ISSN：1944-8252

文摘

Here we report functionalized multiwalled carbon nanotubes (f-MWCNTs)鈥揅dSe nanocrystals (NCs) as photosensitizer in photoelectrochemical cells, where f-MWCNTs were uniformly coated with CdSe NCs onto SnO<sub>2sub> upright standing nanosheets by using a simple electrodeposition method. The resultant blended photoanodes demonstrate extraordinary electrochemical properties including higher Stern鈥揤olmer constant, higher absorbance, and positive quenching, etc., caused by more accessibility of CdSe NCs compared with pristine SnO<sub>2sub>鈥揅dSe photoanode. Atomic and weight percent changes of carbon with f-MWCNTs blending concentrations were confirmed from the energy dispersive X-ray analysis. The morphology images show a uniform coverage of CdSe NCs over f-MWCNTs forming a core鈥搒hell type structure as a blend. Compared to pristine CdSe, photoanode with f-MWCNTs demonstrated a 257% increase in overall power conversion efficiency. Obtained results were corroborated by the electrochemical impedance analysis. Higher scattering, more accessibility, and hierarchical structure of SnO<sub>2sub>-f-MWCNTs-blend鈥揅dSe NCs photoanode is responsible for higher (a) electron mobility (6.89 脳 10<sup>鈥?sup> to 10.89 脳 10<sup>鈥?sup> cm<sup>2sup> V<sup>鈥?sup> S<sup>1鈥?/sup>), (b) diffusion length (27 脳 10<sup>鈥?sup>), (c) average electron lifetime (32.2 ms), and transit time (1.15 ms).