Nanocarbons as Electron Donors and Acceptors in Photoinduced Electron-Transfer Reactions
Nanocarbons as Electron Donors and Acceptors in Photoinduced Electron-Transfer Reactions
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DOI：
10.1149/2.0061706jss
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发表时间：
2017
影响因子：
2.2
通讯作者：
S. Fukuzumi
中科院分区：
文献类型：
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作者：
S. Fukuzumi
由富勒烯、碳纳米管(CNTs)、碳纳米角(CNHs)和石墨烯等杂化sp2碳组成的纳米碳被成功地用作电子供体-受体杂化材料中的电子受体，用于光诱导电子转移反应，很好地模拟了光合作用反应中心的功能。然而，当使用较高的富勒烯如C76和C78或面内金属富勒烯时，或者当纳米碳与相对较强的电子受体结合时，sp2杂化纳米碳也可以用作电子给体。本文研究了富勒烯、碳纳米管、碳纳米管和石墨烯等纳米碳化物的光致电子转移反应，它们既是电子受体，又是电子供体，与四氰基乙烯和四氰基对奎诺二甲烷等强电子受体，由于电子转移的重组能很小，可以很好地产生自由基阳离子fi。或者，电子受体的氧化能力可以通过将Lewis酸与自由基阴离子结合而增强，从而使其能够氧化纳米碳。本文还讨论了富勒烯、碳纳米管和石墨烯等纳米碳化物对快速发展的高功率转换效率钙钛矿型太阳能电池稳定性的重要作用。
Nanocarbons composed of hybridized sp 2 carbons such as fullerenes, carbon nanotubes (CNTs), carbon nanohorns (CNHs) and graphene have been successfully utilized as electron acceptors in electron donor-acceptor hybrids for photoinduced electron-transfer reactions to mimic well the function of the photosynthetic reaction center. However, sp 2 hybridized nanocarbons can also be used as electron donors when higher fullerenes such as C 76 and C 78 or endohedral metallofullerenes are employed or when nanocarbons are combined with relatively strong electron acceptors. This paper focuses on photoinduced electron-transfer reactions of nanocarbons including fullerenes, CNTs, CNHs and graphene, which act as not only as electron acceptors but also as electron donors with strong electron acceptors such as tetracyanoethylene (TCNE) and tetracyano- p -quinodimethan (TCNQ) to produce the radical cations efficiently because of small reorganization energies of electron transfer. Alternatively the oxidizing ability of electron acceptors was enhanced by binding Lewis acids to the radical anions, which enabled to oxidize nanocarbons. The important roles of nanocarbons such as fullerenes, carbon nanotubes and graphenes on the stability of rapidly emerging perovskite based solar cells with high power conversion efficiency have also been discussed in this paper.