Decomposition of water over picene derivatives photocatalyst under visible light irradiation
Decomposition of water over picene derivatives photocatalyst under visible light irradiation
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可见光照射下二烯衍生物光催化剂分解水
DOI：
10.1016/j.cattod.2022.06.008
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发表时间：
2023
期刊：
影响因子：
5.3
通讯作者：
Satoru Nishiyama
中科院分区：
文献类型：
--
作者：
Yuichi Ichihashi;Tomoya Sekiguchi;Yuya Tokui;Rintaro Hori;Shota Naito;Yasuko Koshiba;Youhei Sutani;Kenji Ishida;Keita Taniya;Satoru Nishiyama
合成了一种吸收可见光的碧烯衍生物5,8-二氰二苯（CN-picene），并对其在可见光照射下水解制氢的光催化活性进行了评价。采用真空热蒸发法制备了沉积在石英衬底（CNp/Q）上的CNp -蒎烯薄膜。在有水存在的情况下，将CNp/Q置于可见光照射下观察氢的形成。D2O质谱分析证实，生成的氢来源于水。研究了不同膜厚的CNp/Q光催化剂对水的分解作用；成氢活性随膜厚的增加而增加。此外，扫描电镜测量表明，由于其聚集，cn -蒎烯不均匀沉积在石英衬底上。cn -蒎烯薄膜的表面粗糙度随厚度的增加而增大，从而使其表面积增大；因此，薄膜较厚的CNp/Q催化剂比薄膜较薄的CNp/Q催化剂具有更高的水分解活性。
5,8-dicyanopicene (CN-picene), a picene derivative that absorbs visible-light, was synthesized and its photocatalytic activity for hydrogen production via water decomposition under visible-light irradiation was evaluated. A CN-picene thin-film deposited on a quartz substrate (CNp/Q) was produced by thermal evaporation under vacuum. Hydrogen formation was observed by subjecting CNp/Q to visible-light irradiation in the presence of water. It was confirmed by mass spectrometry using D2O that the generated hydrogen was derived from water. Water decomposition over CNp/Q photocatalysts with different film thicknesses was also investigated; hydrogen-formation activity increased with film thickness. Furthermore, scanning electron microscopy measurements showed that CN-picene was unevenly deposited on the quartz substrate owing to its aggregation. The surface roughness of the CN-picene film increased with its thickness, which consequently increased its surface area; hence, CNp/Q catalysts with thicker films had higher water-decomposition activities than their thinner counterparts.
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