| 1. |
- Xia, Xinxin, et al.
(author)
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Revealing the crystalline packing structure of Y6 in the active layer of organic solar cells: the critical role of solvent additives
- 2023
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In: Journal of Materials Chemistry A. - : ROYAL SOC CHEMISTRY. - 2050-7488 .- 2050-7496. ; 11:40, s. 21895-21907
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Journal article (peer-reviewed)abstract
- The bulk heterojunction (BHJ) morphology of photovoltaic materials is crucial to the fundamental optoelectronic properties of organic solar cells (OSCs). However, in the photoactive layer, the intrinsic crystalline packing structure of Y6, currently the hallmark molecule among Y-series non-fullerene acceptors (NFAs), has not been unambiguously determined. Here, employing grazing-incidence wide-angle X-ray scattering (GIWAXS), we managed to uncover the intrinsic crystalline packing structure of Y6 in the BHJ active layer of OSCs, which is found to be different from its single-crystal structure reported previously. Moreover, we find that solvent additive 1-chloronaphthalene (CN) can induce highly ordered packing of Y6 in BHJ thin films. With the help of atomistic molecular dynamics simulations, it is revealed that pi-pi interactions generally exist between naphthalene derivatives and IC terminals of Y6 analogues, which would essentially improve their long-range ordering. Our work reveals the intrinsic crystalline packing structure of Y6 in the BHJ active layer as well as its crystallization mechanism in thin films, thus providing direct correlations between this crystalline packing and the device characteristics and photophysical properties.
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| 2. |
- Zheng, Meiyu, et al.
(author)
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Efficient acetoin production from pyruvate by engineered Halomonas bluephagenesis whole-cell biocatalysis
- 2023
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In: Frontiers of Chemical Science and Engineering. - : Springer Science and Business Media LLC. - 2095-0187 .- 2095-0179. ; 17:4, s. 425-436
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Journal article (peer-reviewed)abstract
- Acetoin is an important platform chemical, which has a wide range of applications in many industries. Halomonas bluephagenesis, a chassis for next generation of industrial biotechnology, has advantages of fast growth and high tolerance to organic acid salts and alkaline environment. Here, α-acetolactate synthase and α-acetolactate decarboxylase from Bacillus subtilis 168 were co-expressed in H. bluephagenesis to produce acetoin from pyruvate. After reaction condition optimization and further increase of α-acetolactate decarboxylase expression, acetoin production and yield were significantly enhanced to 223.4 mmol·L−1 and 0.491 mol·mol−1 from 125.4 mmol·L−1 and 0.333 mol·mol−1, respectively. Finally, the highest titer of 974.3 mmol·L−1 (85.84 g·L−1) of acetoin was accumulated from 2143.4 mmol·L−1 (188.6 g·L−1) of pyruvic acid within 8 h in fed-batch bioconversion under optimal reaction conditions. Moreover, the reusability of the cell catalysis was also tested, and the result illustrated that the whole-cell catalysis obtained 433.3, 440.2, 379.0, 442.8 and 339.4 mmol·L−1 (38.2, 38.8, 33.4, 39.0 and 29.9 g·L−1) acetoin in five repeated cycles under the same conditions. This work therefore provided an efficient H. bluephagenesis whole-cell catalysis with a broad development prospect in biosynthesis of acetoin.
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