應用於水裂解產氫之Pt/(CuIn)xCd2(1-x)S2光觸媒研究

Pt/(CuIn)xCd2(1-x)S2 Photocatalysts for Water-Splitting Reaction to Produce Hydrogen

黃彥椉(Yen-Cheng Huang)

指導教授 ： 陳炎輝

大同大學/工程學院/化學工程學系所/碩士(2011年)

摘要

(CuIn)xCd2(1-x)S2光觸媒的製備是利用熔鹽法混合不同比例之Cu2S、In2S3和CdS，在加入助熔劑Na2Sx，以1℃/min升至所需的製備溫度，維持一小時候自然冷卻至室溫，經去離子水水洗過濾後再真空乾燥即可得到(CuIn)xCd2(1-x)S2光觸媒粉末。將共觸媒Pt(0.5wt%)利用含浸法負載於(CuIn)xCd2(1-x)S2光觸媒，即可獲得Pt/(CuIn)xCd2(1-x)S2光觸媒。製備得到的光觸媒利用X光繞射分析儀(XRD)、紫外光-可見光光譜分析儀(UV-Vis)、能量散佈光譜儀(EDS)、掃描式電子顯微鏡(SEM)來分析光觸媒的特性。由XRD結果得知，製備溫度600℃時(CuIn)0.05Cd1.90S2光觸媒有較佳的晶體結構，且當(CuIn)xCd2(1-x)S2光觸媒的X值越大時其繞射峰角度越往大角度偏移。由UV-Vis可得知CuInS2和CdS的比例不同時，會造成臨界波長的位移，隨著CuInS2的含量增加會造成臨界波長的紅平移。由EDS鑑定結果得知光觸媒成分確為(CuIn)xCd2(1-x)S2。由SEM得知光觸媒粒徑隨著溫度增加而變大，且隨著CuInS2的含量增加光觸媒的粒徑也會隨之增大。光觸媒之水裂解產氫反應是在加入Na2S(0.25M)/K2SO3(0.35M)犧牲試劑之批次反應器中乙450W金屬鹵素燈照射下進行。由實驗結果得知在6000C下製備的Pt(0.5%)/(CuIn)0.05Cd1.90S2光觸媒之水裂解反應活性最佳，其產氫速率可達1291 μmole/h。

關鍵字

熔鹽法 ； (CuIn)xCd2(1-x)S2 ； 光觸媒 ； 水裂解 ； 氫氣

並列摘要

The photocatalyst (CuIn)xCd2(1-x)S2 is prepared by the flux method by mixing the different proportions of Cu2S, In2S3 and CdS and adding of Na2SX flux to raise to the required preparation temperature. With the temperature elevating rate of 1 0C/min, and maintaining for 1 hour natural cooling to the room temperature, the powder of photocatalysts (CuIn)xCd2(1-x)S2 were obtained after washing with the distilled water and dring in vacuum filtration. All the prepared catalysts were loaded with Pt(0.5%) co-catalyst to become Pt /(CuIn)xCd2(1-x)S2 photocatalysts. The photocatalystic characterization of prepared photocatalyst was investigated with the X-ray diffraction (XRD), UV - Visible Spectrometer (UV-Vis), Energy Dispersed Spectrometer (EDS),and Scanning Electron Microscope (SEM). From the XRD results, it could be known that the (CuIn)0.05Cd1.90S2 photocatalysts possess the best crystalline structure under 600 0C calcination,and with the increase of X in (CuIn)xCd2(1-x)S2 photocatalysts, the diffraction peaks shift more to the wide-angle.From the UV-Vis results, it could be known that with the increase of in (CuIn)xCd2(1-x)S2 photocatalysts, the absorption band edges showed obvious red shift. From the EDS results, it could be known that the composition of the prepared photocatalysts was identified as (CuIn)xCd2(1-x)S2. From the SEM results, it could be known that the particle sizes of photocatalysts increased with the increase of preparation temperature, while prepared under 600 0C calcination, the catalysts possessed uniform grain size, and the particle sizes of photocatalysts increased with the increase of CuInS2 content. The water-splitting reaction with the (CuIn)xCd2(1-x)S2 photocatalysts for hydrogen production was carried out in a batch reaction with the addition of the sacrificial reagent Na2S(0.25M)/K2SO¬3(0.35M) under the irradiation of 450W metallic halogen lamp. From the experimental results, the highest photocatalystic reactivity for the water-splitting reaction was obtained by the Pt(0.5%)/(CuIn)xCd2(1-x)S2 photocatalyst, which was prepared at 600 0C calcination having the highest hydrogen evolution rate of 1291 μmole/h.

並列關鍵字

molten-salt method ； (CuIn)xCd2(1-x)S2 ； Photocatalyst ； Water-Splitting ； Hydrogen

參考文獻

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