1. Solar overall water-splitting by a spin-hybrid all-organic semiconductor.
- Author
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Lin, Xinyu, Hao, Yue, Gong, Yanjun, Zhou, Peng, Ma, Dongge, Liu, Zhonghuan, Sun, Yuming, Sun, Hongyang, Chen, Yahui, Jia, Shuhan, Li, Wanhe, Guo, Chengqi, Zhou, Yiying, Huo, Pengwei, Yan, Yan, Ma, Wanhong, Yuan, Shouqi, and Zhao, Jincai
- Subjects
HETEROGENEOUS catalysts ,SEMICONDUCTORS ,ORGANIC semiconductors ,MOLECULAR crystals ,NEAR infrared radiation ,CHARGE exchange ,SOLAR spectra - Abstract
Direct solar-to-hydrogen conversion from pure water using all-organic heterogeneous catalysts remains elusive. The challenges are twofold: (i) full-band low-frequent photons in the solar spectrum cannot be harnessed into a unified S
1 excited state for water-splitting based on the common Kasha-allowed S0 → S1 excitation; (ii) the H+ → H2 evolution suffers the high overpotential on pristine organic surfaces. Here, we report an organic molecular crystal nanobelt through the self-assembly of spin-one open-shell perylene diimide diradical anions (:PDI2- ) and their tautomeric spin-zero closed-shell quinoid isomers (PDI2- ). The self-assembled :PDI2- /PDI2- crystal nanobelt alters the spin-dependent excitation evolution, leading to spin-allowed S0 S1 →1 (TT) → T1 + T1 singlet fission under visible-light (420 nm~700 nm) and a spin-forbidden S0 → T1 transition under near-infrared (700 nm~1100 nm) within spin-hybrid chromophores. With a triplet-triplet annihilation upconversion, a newly formed S1 excited state on the diradical-quinoid hybrid induces the H+ reduction through a favorable hydrophilic diradical-mediated electron transfer, which enables simultaneous H2 and O2 production from pure water with an average apparent quantum yield over 1.5% under the visible to near-infrared solar spectrum. Achieving direct solar-to-hydrogen conversion from pure water using solely organic heterogeneous catalysts is still challenging. Here the authors report an all-organic semiconductor catalyst system for overall water splitting under visible to near-infrared light via triplet-triplet annihilation up conversion based on spin coupling. [ABSTRACT FROM AUTHOR]- Published
- 2024
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