Hydrogen-Evolving CNT-Photocatalysts for Effective Use of Solar Energy
Hydrogen-Evolving CNT-Photocatalysts for Effective Use of Solar Energy
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用于有效利用太阳能的析氢碳纳米管光催化剂
DOI：
10.1007/978-3-319-92917-0_9
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Miyake Hideaki
中科院分区：
文献类型：
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作者：
Takaguchi Yutaka;Tajima Tomoyuki;Miyake Hideaki
以半导体单壁碳纳米管（s-SWCNTs）为载体，采用具有C60或低聚亚甲基核的聚酰胺-胺树枝状大分子对s-SWCNTs进行物理改性，制备了具有半导体单壁碳纳米管（s-SWCNTs）的放氢光催化剂.这些CNT-光催化剂具有同轴纳米线结构，并且由于s-SWCNT充当光吸收剂而在可见光甚至近红外照明下显示出析氢活性，尽管由s-SWCNT的光激发引发的来自水的析氢反应（HER）是相当罕见的。同轴s-SWCNT/C_（60）异质结可以通过激子的解离有效地产生移动的载流子，如空穴和电子。由于单壁碳纳米管的核与碳纳米管-光催化剂的壳材料之间的组合灵活性，可以合成各种类型的碳纳米管-光催化剂，以控制光催化HER的效率和活性波长。例如，通过将TiOx壳引入到碳纳米管-光催化剂中，在450-nm光照射下，HER的表观量子产率（AQY）达到47%。在1000 nm光照射下，具有（8，3）管的单壁碳纳米管/富勒烯纳米复合材料表现出有效的H2释放，其中AQY为7.3%。值得注意的是，碳纳米管-光催化剂是潜在的有用的，以构建一个Z-计划的光催化系统的整体水裂解。
H2-evolving photocatalysts based on semiconducting single-walled carbon nanotubes (s-SWCNTs) were fabricated via a physical modification of s-SWCNTs using poly(amidoamine) dendrimer having C60or an oligomethylene core. These CNT-photocatalysts possess the coaxial nanowire structure and show H2-evolving activity under visible and even NIR illumination since s-SWCNTs act as light absorbers, although H2evolution reaction (HER) from water triggered by the photoexcitation of s-SWCNTs is quite rare. A coaxial s-SWCNT/C60heterojunction was found to be quite useful for the construction of CNT-photocatalysts due to the efficient generation of mobile carriers, such as holes and electrons, via the exciton dissociation in SWCNT. Owing to the combination flexibility between the core-SWCNT and the shell material of CNT-photocatalysts , various types of CNT-photocatalysts can be synthesized in order to control the efficiency and the active wavelengths of photocatalytic HER. For example, by introducing a TiOxshell into the CNT-photocatalyst, apparent quantum yield (AQY) of HER reached 47% under 450-nm light illumination. SWCNT/fullerodendron nanocomposite having (8,3)tube at the core exhibited efficient H2evolution , of which AQY was 7.3% under 1000-nm light illumination. It is notable that the CNT-photocatalysts are potentially useful to construct a Z-scheme photocatalytic system for the overall water splitting .