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| 1 | Ternary organic solar cells based on polymer donor,polymer acceptor and PCBM components显示文摘In this work,ternary organic solar cells(OSCs)combining a fullerene derivative PC71BM with a nonfullerene acceptor N2200-F blended with a polymer donor PM6 were reported.Compared with the binary systems,the highest power conversion efficiency(PCE)of 8.11%was achieved in ternary solar cells with 30 wt%N2200-F content,mainly due to the improved short-circuit current density(Jsc)and fill factor(FF).Further studies showed that the improved Jsc could attribute to the complementary abso rption of the two acceptors and the enhanced FF was originated from the higher hole mobility and the fine-tuned morphology in the ternary system.These results demonstrate that the combination of fullere ne and nonfullerene acceptors in ternary organic solar cells is a promising approach to achieve high-performance OSCs. | Feng Liu Cheng Li Junyu Li Chao Wang Chengyi Xiao Yonggang Wu Weiwei Li | 2020 | Chinese Chemical Letters2020，31，3： | 3 |
| 2 | MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries显示文摘MoS2 has attracted a lot of interest in the field of lithium-ion storage as ananode material owing to its high capacity and two-dimensional (2D)-layerstructure. However, its electrochemical properties, such as rate capability andcycling stability, are usually limited by its low conductivity, volume variation, andpolysulfide dissolution during lithiation/delithiation cycling. Here, a designedtwo-layer carbon-coated MoS2/carbon nanofiber (MoS2/C/C fiber) hybrid electrodewith a double-layer carbon coating was achieved by a facile hydrothermal andsubsequent electrospinning method. The double carbon layer (inner amorphouscarbon and outer carbon fiber) shells could efficiently increase the electronconductivity, prevent the aggregation of MoS2 flakes, and limit the volumechange and polysulfide loss during long-term cycling. The as-prepared MoS2/C/Cfiber electrode exhibited a high capacity of up to 1,275 mAh/g at a currentdensity of 0.2 A/g, 85.0% first cycle Coulombic efficiency, and significantlyincreased rate capability and cycling stability. These results demonstrate thepotential applications of MoS2/C/C fiber hybrid material for energy storage andmay open up a new avenue for improving electrode energy storage performanceby fabricating hybrid nanofiber electrode materials with double-layer carboncoatings. | Hao Wu Chengyi Hou Guozhen Shen Tao Liu Yuanlong Shao Ru Xiao Hongzhi Wang | 2018 | Nano Research2018，11，11： | 2 |
| 3 | Efficient conversion of benzene and syngas to toluene and xylene over ZnO-ZrO_(2)&H-ZSM-5 bifunctional catalysts显示文摘A series of ZnO-ZrO_(2) solid solutions with different Zn contents were synthesized by the urea coprecipitation method,which were coupled with H-ZSM-5 zeolite to form bifunctional catalysts.As a new benzene alkylation reagent,syngas was used instead of methanol to realize the efficient conversion of syngas and benzene into toluene and xylene.A suitable ratio of ZnO-ZrO_(2) led to the significant improvement in the catalytic performance,and a suitable amount of acid helped to increase the selectivity of toluene/xylene and reduce the selectivity of the by-products ethylbenzene and C^(9+) aromatics.The highest benzene conversion of 89.2%and toluene/xylene selectivity of 88.7%were achieved over 10%ZnO-ZrO_(2)&H-ZSM-5(Si/Al=23)at a pressure of 3 MPa and a temperature of 450℃.In addition,the effect of the zeolite framework structure on product distribution was examined.Similar to the molecular dynamics of aromatic hydrocarbons,H-ZSM-5 zeolites comprise 10-membered-ring pores,which are beneficial to the activation of benzene;hence,the conversion of benzene is higher.H-ZSM-35 and HMOR zeolites exhibited small eight-membered-ring channels,which were not conducive to the passage of benzene;hence,the by-product ethylbenzene exhibits a higher selectivity.The distance between the active centers of the bifunctional catalysts was the main factor affecting the catalytic performance,and the powder mixing method was more conducive to the conversion of syngas and benzene. | Xiao Zhao Xuan Shi Zhongshun Chen Long Xu Chengyi Dai Yazhou Zhang Xinwen Guo Dongyuan Yang Xiaoxun Ma | 2022 | Chinese Journal of Chemical Engineering2022，35，5： | 2 |
| 4 | Mechanical-robust and recyclable polyimide substrates coordinated with cyclic Ti-oxo cluster for flexible organic solar cells显示文摘With the rapid development of flexible optoelectronic devices,recyclability is highly desirable for alleviating resource waste and environmental pollution,but remains challenging.Here,a fully closed-loop recyclable crosslinked polyimide(RCPI)was fabricated via carboxyl ligand exchange between the CPI with pendent carboxyl groups and the cyclic Ti-oxo cluster(CTOC)with labile carboxyl ligands,which could be reconverted into reprocessable CPI and CTOC solution by pivalic acid.The RCPI-based embedded AgNWs@RCPI electrode shows comparable high conductivity,transparency and low roughness with ITO(indium tin oxide)/glass electrode,and meanwhile outstanding mechanical robustness.The related flexible organic solar cells(FOSCs)provided a high efficiency of 14.78% and maintained~97% of the initial efficiency after 5000 bending cycles at a small bending radius of 1 mm.Moreover,the recyclability of the RCPI still retains after being manufactured into the FOSCs.This work provides a promising strategy for recyclable flexible optoelectronic devices. | Guangcong Zhang Qiaomei Chen Chengcheng Xie Yongmei Wang Chaowei Zhao Chengyi Xiao Yen Wei Weiwei Li | 2022 | npj Flexible Electronics2022，6，1： | 1 |
| 5 | Astrocytic endothelin-1 overexpression impairs learning and memory ability in ischemic stroke via altered hippocampal neurogenesis and lipid metabolism显示文摘Vascular etiology is the second most prevalent cause of cognitive impairment globally.Endothelin-1,which is produced and secreted by endothelial cells and astrocytes,is implicated in the pathogenesis of stroke.However,the way in which changes in astrocytic endothelin-1 lead to poststroke cognitive deficits following transient middle cerebral artery occlusion is not well understood.Here,using mice in which astrocytic endothelin-1 was overexpressed,we found that the selective overexpression of endothelin-1 by astrocytic cells led to ischemic stroke-related dementia(1 hour of ischemia;7 days,28 days,or 3 months of reperfusion).We also revealed that astrocytic endothelin-1 overexpression contributed to the role of neural stem cell proliferation but impaired neurogenesis in the dentate gyrus of the hippocampus after middle cerebral artery occlusion.Comprehensive proteome profiles and western blot analysis confirmed that levels of glial fibrillary acidic protein and peroxiredoxin 6,which were differentially expressed in the brain,were significantly increased in mice with astrocytic endothelin-1 overexpression in comparison with wild-type mice 28 days after ischemic stroke.Moreover,the levels of the enriched differentially expressed proteins were closely related to lipid metabolism,as indicated by Kyoto Encyclopedia of Genes and Genomes pathway analysis.Liquid chromatography-mass spectrometry nontargeted metabolite profiling of brain tissues showed that astrocytic endothelin-1 overexpression altered lipid metabolism products such as glycerol phosphatidylcholine,sphingomyelin,and phosphatidic acid.Overall,this study demonstrates that astrocytic endothelin-1 overexpression can impair hippocampal neurogenesis and that it is correlated with lipid metabolism in poststroke cognitive dysfunction. | Jie Li Wen Jiang Yuefang Cai Zhenqiu Ning Yingying Zhou Chengyi Wang Sookja Ki Chung Yan Huang Jingbo Sun Minzhen Deng Lihua Zhou Xiao Cheng | 2024 | Neural Regeneration Research2024，19，3： | 1 |
| 6 | Fused-ring induced end-on orientation in conjugated molecular dyads toward efficient single-component organic solar cells显示文摘The molecular orientations of conjugated materials on the substrate mainly include edge-on,face-on,and end-on.Edge-on and face-on orientations have been widely observed,while end-on orientation has been rarely reported.Since in organic solar cells(OSCs)charge transport is along the vertical direction,end-on orientation with conjugated backbones perpendicular to the substrate is recognized as the ideal microstructure for OSCs.In this work,we for the first time obtained the preferential end-on orientation in a conjugated molecular dyad that contains a conjugated backbone as donor and perylene bisimide side units as acceptor.This was realized by introducing a fused-ring structure to replace linear terthiophenes with conjugated backbones,yielding F-MDPBI and L-MDPBI respectively.Surprisingly,a shifting trend of the molecular orientation from dominating edge-on in L-MDPBI to preferential end-on in F-MDPBI was observed.As a consequence,vertical charge carrier mobilities in F-MDPBI are one order of magnitude higher than those with preferential edge-on orientation,so single-component OSCs based on this molecular dyad as a single photoactive layer provided a power conversion efficiency of 4.89% compared to 1.70% based on L-MDPBI with preferential edge-on orientation. | Dongdong Xia Shengxi Zhou Wen Liang Tan Safakath Karuthedath Chengyi Xiao Chaowei Zhao Frédéric Laquai Christopher R.McNeill Weiwei Li | 2023 | Aggregate2023，4，2： | 0 |
| 7 | Low temperature,non-halogen solvent processed single-component organic solar cells with 10%efficiency显示文摘A double-cable conjugated polymer DCPIC-BO is designed via introducing a long-branched alkyl chains 2-buthyloctyl into the acceptor side unit.Compared with the double-cable polymer(DCPIC-EH)with the 2-ethylhexyl alkyl chains,the solubility of the DCPIC-BO in non-halogen solvents is substantially improved.Therefore,a power conversion efficiency(PCE)of 9.77%can be obtained by the devices processed from o-xylene at 40℃,while the DCPIC-EH cannot be processed due to its poor solubility under this condition.Moreover,PCEs of 10.10%for small-area(0.04 cm^(2))devices and nearly 9%for devices with an area of 1 cm^(2) are achieved using a non-halogenated solid additive in o-xylene,realizing the'absolutely halogen-free'OSC fabrication. | Zhou Zhang Jjing Wang Zhijie Hu Chengyi Xiao Qiaomei Chen Zheng Tang Weiwei Li | 2023 | Chinese Chemical Letters2023，34，12： | 0 |
| 8 | A benzo[ghi]-perylene triimide based double-cable conjugated polymer for single-component organic solar cells显示文摘Single-component organic solar cells(SCOSCs)with high stability and simplified fabrication process are supposed to accelerate the commercialization of organic photovoltaics.However,the types of photo-active materials and photovoltaic performance of SCOSCs are still far lagging behind the bulk-heterojunction type organic solar cells(BHJ OSCs).It is still an arduous task to introduce new photo-active materials into SCOSCs,aiming to improve the efficiencies of SCOSCs.One feasible way is to construct double-cable polymers with new structures and tune conformation,morphology and mobility for the improvement in power conversion efficiencies(PCEs).Hence,in this work,we constructed a new double-cable polymer PBTT-BPTI by introducing fused core 5,7-dibromo-2,3-bis(2-ethylhexyl)benzo[1,2-b:4,5-c’]dithiophene-4,8-dione(TTDO)into the main backbone and benzo[ghi]-perylene triimide(BPTI)unit into the side chain.Both of the two units show strong electron-withdrawing property,which are expected to broaden absorption spectra and enhance intermolecular interaction.The double-cable polymer exhibited a broad absorption in the range of 300-700 nm with an optical band gap(E_(g))of 1.79 eV.The PCE of PBTT-BPTI-based SCOSCs was 2.15%,which may be limited by the unconstructed efficient electron transporting channels. | Dan Wang Zhaofan Yang Feng Liu Chengyi Xiao Yonggang Wu Weiwei Li | 2022 | Chinese Chemical Letters2022，33，1： | 0 |
| 9 | When insulating polymers meet conjugated polymers:the noncovalent bonding does matter显示文摘Insulating polymers are characterized by a predominantlyσ-covalent structure,which localize electrons in the atoms and exhibit dielectricity.Insulating polymers typically adopt a more linear and extended conformation,as the repeating units are connected by single covalent bonds,resulting in a relatively straight and extended chain structure.For most insulating polymers,the contour length(L_(c))is significantly larger than their persistence length(Lp)due to the rotation of C−C single bonds(Fig.1(a)).Consequently,this leads to a flexible,random-coil chain conformation.This structural feature contributes to the great mechanical durability and resistance to crack initiation during stretching or bending processes.In contrast,conjugated polymers possess aπ-conjugated molecular structure,allowing electron mobility along the main chain,called delocalization,which imparts semiconducting properties[1,2].The presence of rigid,alternating single and multiple bonds results in comparable Lc and Lp,thereby yielding a stiff or semi-flexible conformation(Fig.1(b))[3,4].As a consequence,most conjugated polymers are prone to fracture under low strain levels(<10%)[5−7]. | Zhonggao Bu Chengyi Xiao Jie Sun Weiwei Li Liming Ding | 2023 | Journal of Semiconductors2023，44，11： | 0 |
| 10 | Alkyl-thiophene-alkyl linkers to construct double-cable conjugated polymers for single-component organic solar cells显示文摘In this work,semirigid linkers of the alkyl-thiophene-alkyl structure are developed to construct double-cable polymers.Three alkyl units,propyl(C3H6),hexyl(C6H12),and dodecyl(C12H24),are applied as semirigid linkers,yielding three double-cable polymers:PBC6-T,PBC12-T,and PBC24-T,respectively.PBC12-T which uses C6H12-thiophene-C6H12 linkers is found to exhibit the best device efficiency of 5.56%,while PBC6-T and PBC24-T with shorter or longer linkers yield device efficiencies of only 2.65%and 1.09%in single-component organic solar cells(SCOSCs).Further studies reveal that PBC12-T exhibits higher crystallinity and improved charge transport,resulting in better efficiencies.Our work provides an approach to construct double-cable conjugated polymers with long alkyl linkers,and it shows the importance of the linker length for the photovoltaic performance of SCOSCs. | Wenbin Lai Safakath Karuthedath Chengyi Xiao Lei Meng Frédéric Laquai Weiwei Li Yongfang Li | 2024 | Chinese Chemical Letters2024，35，1： | 0 |
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