電沉積CdS/TiO2光陽極以應用於
光電化學產氫之研究

游博盛

doi:10.6844/NCKU.2011.00453

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電沉積CdS/TiO2光陽極以應用於光電化學產氫之研究

A Study on Electrodeposition of CdS/TiO2 Photoanode Applied in Photoelectrochemical Hydrogen Generation

游博盛 , Masters　　Advisor：陳慧英　　

繁體中文 DOI： 10.6844/NCKU.2011.00453

硫化鎘；二氧化鈦；電沉積；光電化學；產氫； cadmium sulfide ； titanium dioxide ； electrodeposition ； photoelectrochemical ； hydrogen generation

Abstract │ Reference (120) │ Times Cited (2) │ Altmetrics

Abstract 〈TOP〉

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In this work, CdS/TiO2 photoanodes were prepared starting from cadmium chloride and sodium thiosulfate by pulse electrodeposition. The influences of preparation conditions and TiO2 template on the composition and microstructure of resulting photoanodes were investigated. Furthermore, the photoactivity of photoanode and the hydrogen generation rate were studied as well.
From the study of TiO2 template effect, it revealed that the diameter, wall thickness, and length of nanotubes were strongly governed by anodizing voltage, whereas the anodizing time could only manipulate the final tube length. For the study of CdS electrodeposition, preparation conditions including applied voltage, electrolyte composition, input electricity, soaking time, deposition temperature, and calcination temperature were investigated. For the study of TiO2 template effect, both of anodizing voltage and time were investigated by means of XRD, SEM, TEM, XPS, and UV techniques. The activity measurements were carried out in a photoelectrochemical (PEC) cell with an electrolyte of 0.25 M Na2S and 0.35 M Na2SO3 under illumination by Xe lamp (100 mW/cm2). Furthermore, the hydrogen generation rate was measured in a PEC reactor comprised of two compartments separated by an ion exchange membrane.
The experimental results showed that deposition amount, particle size, defect, and surface state of CdS and the corresponding photo-activities can be correlated with deposition conditions. An optimal applied voltage was -0.7 V (vs. Ag/AgCl), and the cadmium and thiosulfate concentrations were 0.02 and 0.2 M, respectively. The rate of electrodeposition was so fast that merely 3 minutes were required for accomplishing each run of input electricity of 0.2 C. For avoiding the polarization due to diffusion limitation, the pulse deposition with proper soaking was adopted in this work. The result also showed that the optimal soaking time was 10 minutes. As increasing the input electricity, the deposited amount of CdS increased and therefore the photoactivity was consistently increased attributing from the generation of more hole-electron pairs. However, the maximum photoactivity of CdS/TiO2 photoanode was obtained at a total input electricity of 1 C. In fact, overloading CdS would contrarily lead to reducing the photoactivity due to considerable increases of hole-electron recombination. Eventually, the optimal calcination temperature was found to be 300 oC.
In this study, with the TiO2 template anodized at 40 V for 6 hr(3.0μm), the resulting CdS/TiO2 photoanode exhibited the maximum photoactivity, e.g., a photocurrent of 7.61 mA/cm2, a photoconversion efficiency of 5.51%, and a hydrogen generation rate of 1.88 ml/cm2-h. 
In conclusion, the CdS/TiO2 photoanodes prepared in this work demonstrated larger photocurrent and photoconversion efficiency than those prepared by the sequence-chemical bath deposition (s-CBD), which showed a promising potential of future development.

Reference ( 120 ) 〈TOP〉

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5. Sorensen, B “Hydrogen and Fuel Cell” Elsevier academic press, burlington
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