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  • 學位論文

硼化鈷在石墨型氮化碳奈米片上之附載量對光催化產氫的影響

Effect of Loaded Cobalt Boride Amount on Graphitic Carbon Nitride Nanosheet in Photocatalytic Hydrogen Generation

指導教授 : 吳紀聖 教授
共同指導教授 : -(Akawat Sirisuk)

摘要


價格高昂的貴金屬共觸媒如Pt、Ru及Ir被廣泛應用光催化產氫反應,同時,價格便宜的金屬共觸媒亦具備提升光催化產氫活性的能力,例如:金屬磷化物、金屬碳化物和金屬硼化物。近年來的文獻中提到以硼化鎳(NiB)作為共觸媒負載於石墨型氮化碳奈米片(graphitic carbon nitride nanosheet, gCNS)上在可見光環境下展現優異的產氫效率。因此本研究試圖將硼化鈷(CoB)作為石墨型氮化碳奈米片的共觸媒進行光催化產氫反應,並與硼化鎳進行比較。吾人成功合成出由1 wt%至11 wt%負載量的硼化鈷做為共觸媒負載於石墨型氮化碳奈米片上(CoB-gCNS),由搭載可見光濾光片的300W氙燈照射下進行光催化水分解產氫反應,並以三乙醇胺作為犧牲試劑。結果顯示9wt%的CoB-gCNS擁有最高活性,最高可達成60.71 µmole/g/h的H2產率,與未搭載共觸媒的石墨型氮化碳奈米片相比其光催化活性得到顯著提升。此提升歸因於以下幾種光電化學性能的增強:光吸收度的提升、電子遷移率的提升、能隙的下降以及電子電洞再結合率的下降。此外,負載9 wt%硼化鈷的石墨型氮化碳奈米片CoB-gCNS光催化活性甚至高於文獻中的最佳觸媒,7wt% 硼化鎳負載於石墨型氮化碳奈米片7NiB-gCNS (51.29 µmole/g/h)。

並列摘要


Noble metals, such as Pt, Ru, and Ir, have been widely used as expensive catalyst promoters to enhance the photocatalytic hydrogen evolution reaction (HER). On the other hand, other cheaper catalyst promoters that can also promote high HER performance have been developed, such as metal phosphides, metal carbides, and metal borides. Recently, nickel boride (NiB) loaded on graphitic carbon nitride nanosheet (gCNS) has exhibited promising HER performance under visible light. Thus, this research attempts to investigate HER performance of cobalt boride (CoB) as a cocatalyst on CNS and compare to the HER performance of NiB. The amount of CoB loading was varied from 1-11 wt%CoB-gCNS (1-11CoB-gCNS). The reaction was carried out under 300W Xenon lamp equipped with visible light filter. Triethanolamine was employed as a sacrificial agent. The best HER performance was observed for 9wt%CoB-gCNS at 60.71 µmole/g/h of H2 evolved. This result showed a significant enhancement in HER performance, compared with that of pure CNS, which is attributed to better photoelectrochemical of the photocatalyst. The light absorbance and electron mobility of 9CoB-gCNS are significantly enhanced. Additionally, the band gap energy and the recombination rate of electron are obviously lower which support the superior HER performance of 9CoB-gCNS. Moreover, the activity of 9CoB-gCNS is higher than that of 7NiB-gCNS (51.29 µmole/g/h) of H2 evolved which 7wt% is claimed to be the optimum content of NiB on gCNS.

參考文獻


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