用于光催化水析氢的单壁碳纳米管/二氧化钛中的热电子提取

Hot Electron Extraction in SWCNT/TiO for Photocatalytic H Evolution from Water.

作者信息

Yamagami Masahiro, Tajima Tomoyuki, Zhang Zihao, Kano Jun, Yashima Ki-Ichi, Matsubayashi Takana, Nguyen Huyen Khanh, Nishiyama Naoto, Hayashi Tomoya, Takaguchi Yutaka

机构信息

Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama 700-8530, Japan.

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan.

出版信息

Nanomaterials (Basel). 2022 Oct 29;12(21):3826. doi: 10.3390/nano12213826.

DOI:10.3390/nano12213826

PMID:36364601

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9654061/

Abstract

Single-walled carbon nanotube (SWCNT)/TiO2 hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO2 hybrids with visible light (λ > 422 nm), the hydrogen evolution reaction proceeded at a rate of 0.95 mmol/h·g in the presence of a sacrificial agent (1-benzyl-1,4-dihydronicotinamide, BNAH). External quantum yields (EQYs) of the hydrogen production reaction photosensitized by (6,5), (7,5), and (8,3) tubes were estimated to be 5.5%, 3.6%, and 2.2%, respectively, using monochromatic lights corresponding to their E22 absorptions (570 nm, 650 nm, and 680 nm). This order of EQYs (i.e., (6,5) > (7,5) > (8,3)SWCNTs) exhibited the dependence on the C2 energy level of SWCNT for EQY and proved the hot electron extraction pathway.

摘要

以1,10 - 双（癸氧基）癸烷核的聚酰胺 - 胺（PAMAM）树枝状大分子作为分子胶水合成了单壁碳纳米管（SWCNT）/二氧化钛（TiO₂）杂化物。在用可见光（λ > 422 nm）照射SWCNT/TiO₂杂化物的水分散体时，在牺牲剂（1 - 苄基 - 1,4 - 二氢烟酰胺，BNAH）存在下，析氢反应以0.95 mmol/h·g的速率进行。使用对应于它们E22吸收（570 nm、650 nm和680 nm）的单色光，估计由（6,5）、（7,5）和（8,3）管光敏化的产氢反应的外量子产率（EQY）分别为5.5%、3.6%和2.2%。这种EQY的顺序（即（6,5）>（7,5）>（8,3）SWCNTs）表现出EQY对SWCNT的C2能级的依赖性，并证明了热电子提取途径。