本研究係以化學浴沉積法(CBD)製備CdS/TiO2光陽極，並以光電化學法(PEC)探討其光電化學反應活性及產氫速率。實驗中，首先以陽極氧法製備二氧化鈦奈米管陣列，再以硝酸鎘(Cd(NO3)2)及硫化鈉(Na2S)作為前驅鹽，將硫化鎘沉積於二氧化鈦奈米管表面，再經煅燒即可得CdS/TiO2。文中改變製備條件包括：煅燒氣氛及溫度，沉積法之含浸時間、次數、溶劑種類及UV光照等變因，探討其對CdS/TiO2表面形態、晶相結構、能隙及光活性等性質之影響，並進一步探討其產氫速率之結果。

實驗結果顯示，在空氣中煅燒所得CdS/TiO2光陽極之光活性較氮氣中煅燒者為佳。經300 oC煅燒後，CdS呈閃鋅礦(zinc blende)結構，並摻有少量纖鋅礦(wurtzite)晶態。當CBD沉積條件為：依序含浸於硝酸鎘、硫化鈉水溶液中20分鐘、反覆13次，所得之CdS(W)/TiO2光陽極具最佳光活性。經PEC測試，以Xenon燈(I0 = 100 mW/cm2)照射光陽極，採用0.25 M Na2S+0.35 M Na2SO3作為電解液，可得飽和光電流值6.163 mA/cm2，其最大光電化學轉換效率為4.45 %；另以雙槽型PEC系統測試其產氫速率高達1.49 ml/cm2-hr。

本研究進一步探討含浸程序之溶劑效應，結果發現以水配製硝酸鎘前驅鹽溶液所製備之CdS(W)/TiO2光陽極，其光活性優於以酒精(95%)為溶劑所得之CdS(A)/TiO2光陽極。經特性分析發現，於不同含浸次數下，其CdS(W)/TiO2光陽極表面之CdS粒徑均較CdS(A)/TiO2為大，但其承載CdS含量較多，且光陽極能隙較小。PEC實驗結果顯示CdS(W)/TiO2光陽極具較佳之光活性。另外，含浸中同時照射UV光(λmax=253.7 nm)下，所得CdS(UV)/TiO2光陽極，經分析發現照射UV光確有助於鎘離子吸附於TiO2表面，但卻會造成CdS發生團聚，而致光活性較CdS(W)/TiO2為差。

In this study, the CdS/TiO2 photoanodes were prepared by chemical bath deposition (CBD) technique. The photoactivity of CdS/TiO2 photoanodes and hydrogen generation were studied via photoelectrochemical (PEC) process. Experimentally, the self-assembled TiO2 nanotube arrays were formed by electrochemical anodization process, then the TiO2 nanotubes arrays were sequentially immersed in Cd(NO3)2 and Na2S solution several times to fabricate CdS/TiO2 photoanode. The experimental conditions including calcination atmosphere and temperature, immersion time, number of immersion, solvent, and UV illumination were investigated. Besides, the properties of CdS/TiO2 photoanodes such as surface morphology, crystalline structure and band gap were discussed. The photoactivities of CdS/TiO2 photoanodes and hydrogen generation via photoelectrochemical splitting of water were also studied.

From the experimental results, the photoactivity of photoanode calcined in air atmosphere was better than that in nitrogen atmosphere. The CdS grains calcined at 300 oC was zinc blende structure with small quantity of wurtzite. From the PEC results, it revealed that the CdS/TiO2 sample with the highest photoactivity was obtained at immersing time of 20min and repeating 13 cycles. The saturation current density was 6.163 mA/cm2 and the maximum photoelectrochemical conversion was 4.45 % in the PEC system under Xenon lamp (I0 = 100 mW/cm2) illumination. The hydrogen generation rate for the sample was 1.49 ml/cm2-hr measured with a double-tank PEC reactor.

The solvent effect in CBD procedure was investigated in advance. It was found that the photoactivities of CdS(W)/TiO2 prepared starting from the aqueous Cd(NO3)2 solution were higher than those of prepared in ethanol(95%) solution. From the result of characterization, as compared with CdS(A)/TiO2, the CdS(W)/TiO2 showed bigger particle size. However, the CdS amount in CdS(W)/TiO2 sample was relatively large, and the band gap was smaller. On the other hand, the photoactivity of CdS(UV)/TiO2 which prepared under UV (λmax=253.7 nm) illumination somewhat reduced. In the presence of UV light, it resulted in increase of the Cd2+ adsorption on the TiO2 surface. However, it also accompanied with aggregation of CdS.

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