Electron-accepting carborane viologen and iron based-supramolecular polymers for electrochromism and enhanced photocatalytic hydrogen evolution

Highly electron-accepting viologen derivatives, o -carborane viologens (CbV 2+ ), and their iron based-supramolecular polymers (FeSPs) with tunable optoelectronic properties have been reported. Carborane viologens show excellent electron redox properties with low reduction threshold (−0.55 V) and th...

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Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2020-12, Vol.8 (46), p.16326-16332
Main Authors: Yang, Xiaodong, Zhang, Yueyan, Zhang, Bingjie, Zhang, Sikun, Liu, Xu, Li, Guoping, Chu, Dake, Zhao, Yongtao, He, Gang
Format: Article
Language:English
Subjects:
Carborane
Charge transfer
Crystallography
Divalent cations
Electrochromic cells
Electrochromism
Electromagnetic absorption
Electrons
Hydrogen evolution
Iron
Optoelectronics
Photocatalysis
Supramolecular polymers
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Summary:Highly electron-accepting viologen derivatives, o -carborane viologens (CbV 2+ ), and their iron based-supramolecular polymers (FeSPs) with tunable optoelectronic properties have been reported. Carborane viologens show excellent electron redox properties with low reduction threshold (−0.55 V) and three redox states (divalent cation, radical cation and neutral), which were used to fabricate high-performance electrochromic devices (ECDs). The enhanced photocatalytic hydrogen evolution of the CbV 2+ -based FeSP was achieved (105 times more than CbMV 2+ , 2 times more than viologen-based FeSP) due to its multi-redox center, narrow band gaps, wide visible light absorption (∼580 nm), and especially the metal-ligand charge transfer (MLCT) process. This contribution provides important information for designing and understanding novel viologens and will greatly expand the scope of photocatalysis. CbV 2+ and its FeSPs with good optoelectronic properties were used to fabricate a high contrast ECD and enhanced visible-light-driven HER.
ISSN:2050-7526
2050-7534
DOI:10.1039/d0tc04603e