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Ultrafast Electron Transfer in All-Small-Molecule Photovoltaic Blends Promoted by Intermolecular Interactions in Cyanided Donors

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Chinese Journal of Chemical Physics 2021年第6期34卷 751-760,I0002,I0031-I0052页

作者： Guo-dong Wang Zhi-xing Liu Bei-bei Qiu Zhi-guo Zhang Rui Wang Xiao-yong Wang Jing Ma Yong-fang Li Min Xiao Chun-feng Zhang National laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center for Advanced MicrostructuresNanjing UniversityNanjing 210093China Beijing National laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State key laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic Chemistry of Ministry of EducationSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China Department of Physics University of ArkansasFayettevilleArkansas 72701USA

Cyano substitution has been established as a viable approach to optimize the performance of all-small-molecule organic solar ***,the effect of cyano substitution on the dynamics of photo-charge generation remains largely ***,we report an ultrafast spectroscopic study showing that electron transfer is markedly promoted by enhanced intermolecular charge-transfer interaction in all-small-molecule blends with cyanided *** delocalized excitations,arising from intermolecular interaction in the moiety of cyano-substituted donor,undergo ultrafast electron transfer with a lifetime of∼3 ps in the *** contrast,some locally excited states,surviving in the film of donor without cyano substitution,are not actively involved in the charge *** findings well explain the performance improvement of devices with cyanided donors,suggesting that manipulating intermolecular interaction is an efficient strategy for device optimization.

关键词： Electron transfer Organic solar cells Charge-transfer interaction

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Enhance the activity of multi-carbon products for Cu via P doping towards CO_(2) reduction

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Science China Chemistry 2021年第7期64卷 1096-1102页

作者： Xiangdong Kong Cheng Wang Han Zheng Zhigang Geng Jun Bao Jie Zeng Hefei National laboratory for Physical Sciences at the Microscale Key La boratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation laboratory University of Science and Technology of ChinaHefei 230026China

Electronic structure engineering is a powerful method to tailor the behavior of adsorbed intermediates on the surface of catalysts,thus regulating catalytic activity towards CO_(2)***,we prepared a series of P-doped Cu catalysts for CO_(2)electroreduction into multi-carbon(C_(2+))products by regulating the surface electronic structure of *** introduction of P could stabilize the surface Cu^(δ+)species,enhancing the activity for C_(2+)products via adjusting the adsorbed strength of the CO intermediates(~*CO).When the molar ratio of P to Cu was 8.3%,the catalyst exhibited a Faradaic efficiency of 64%for C_(2+)products,which was 1.9 times as high as that(33%)for Cu catalysts at the applied current density of 210 m A cm^(-2).Notably,at the applied current density of 300 mA cm^(-2),the P-doped Cu catalyst with the molar ratio of P to Cu of 8.3%exhibited the highest partial current density for C_(2+)products of 176 mA cm^(-2),whereas the partial current density for C_(2+)products over the Cu catalyst was only 84 mA cm^(-2).Mechanistic studies revealed that modulating the molar ratios of P to Cu regulated the adsorbed strength of~*CO.A moderate adsorbed strength of *CO induced by appropriate P doping was responsible for the facilitated C–C coupling process.

关键词： P-doped Cu catalysts C^(2+)products ~*CO adsorption CO_(2)electroreduction

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Layered manganese phosphorus trisulfides for high-performance lithium-ion batteries and the storage mechanism

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Carbon energy 2023年第3期5卷 160-169,170,171页

作者： Hailin Shen Yueling Cai Zhongtao Ma Peng Wang Bingkun Guo Jipeng Cheng Qianqian Li Hongtao Wang Zhongyuan Liu Anmin Nie Jinsong Wu Materials Genome Institute Shanghai UniversityShanghaiChina Shanghai key laboratory of Mechanics in energy Engineering School of Mechanics and Engineering ScienceShanghai Institute of Applied Mathematics and MechanicsShanghai UniversityShanghaiChina State key laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouChina Center for X‐mechanics Zhejiang UniversityHangzhouChina State key laboratory of Metastable Materials Science and Technology Center for High Pressure ScienceYanshan UniversityQinhuangdaoChina State key laboratory of advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina Nanostructure Research Center Wuhan University of TechnologyWuhanChina

Although advanced anode materials for the lithium-ion battery have been investigated for decades,a reliable,high-capacity,and durable material that can enable a fast charge remains ***,we report that a metal phosphorous trichalcogenide of MnPS_(3)(manganese phosphorus trisulfide),endowed with a unique and layered van der Waals structure,is highly beneficial for the fast insertion/extraction of alkali metal ions and can facilitate changes in the buffer volume during cycles with robust structural *** few-layered MnPS_(3)anodes displayed the desirable specific capacity and excellent rate chargeability owing to their good electronic and ionic *** assembled as a half-cell lithium-ion battery,a high reversible capacity of 380 mA h g^(−1)was maintained by the MnPS_(3)after 3000 cycles at a high current density of 4 A g^(−1),with a capacity retention of close to or above 100%.In full-cell testing,a reversible capacity of 450 mA h g^(−1)after 200 cycles was maintained as *** results of in-situ TEM revealed that MnPS_(3)nanoflakes maintained a high structural integrity without exhibiting any pulverization after undergoing large volumetric expansion for the insertion of a large number of lithium *** kinetics of lithium-ion diffusion,stable structure,and high pseudocapacitance contributed to their comprehensive performance,for example,a high specific capacity,rapid charge-discharge,and long ***_(3)is thus an efficient anode for the next generation of batteries with a fast charge/discharge capability.

关键词： cyclic stability in‐situ TEM MnPS3 pseudocapacitance rate performance

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Design of a MAPS readout electronics prototype for BESIII inner tracker

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Radiation Detection Technology and Methods 2020年第2期4卷 241-249页

作者： Xing-cheng Tian Xiao-shan Jiang Jun Hu Qun Ou Yang Ming-yi Dong Chao-yue Qu Xu-dong Ju Hong-yu Zhang Ye Wu Xiao-xu Lu State key laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of Sciences(CAS)Beijing 100049China University of Chinese Academy of Sciences(Ucas) Beijing 100049China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of Sciences(CAS)Dongguan 523803China

Background The spatial resolution and the reconstruction efficiency of the main drift chamber of the Beijing Spectrometer III has degraded aftermore than nine years of *** improved new inner drift chamber has been constructed to replace the old chamber in case of the radiation *** active pixel sensor(MAPS)based detector prototype is selected as one of the prototype schemes for the inner chamber *** Design a set of MAPS readout electronics system for the inner drift chamber *** system can verify the function and performance of the selected MAPS chip and discover the matters needing attention when designing large-scale *** The electronics system design is composed of three *** first part is flexible printed circuit boards(PCBs)assembled with the MAPS *** second part is digital readout boards,which are connected to the flexible PCBs via FPGA mezzanine card *** digital readout board realizes the configuration of the MAPS chip register,receives and processes the data output by the MAPS chip,and transfers the processed data to the DAQ *** third part includes a readout control board and two fan-out boards that used to separately fan out the trigger signal and the start signal to all the digital readout *** and conclusion AMAPS readout electronics system consisting of five MAPS based detector prototypes is *** system can work stably under the electron beam experimental conditions with a frequency up to 2 kHz and energy ranging from 1 to 5 *** system detection efficiency of the electron beam is∼95%,and the spatial resolution is∼5.3μm at electron energies of 1 *** design of the electronics system meets the requirements for verifying the performance of the MAPS chips and the technical feasibility of the detector structure.

关键词： BESIII MAPS pixel detector JTAG FPGA

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Experimental measurement of proton conductivity and electronic conductivity of membrane electrode assembly for proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2020年第6期30卷 912-917页

作者： Ruili Sun Zhangxun Xia Congrong Yang Fenning Jing Suli Wang Gongquan Sun Division of Fuel Cells and Battery Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences key laboratory of Fuel Cells & Hybrid Power Sources Chinese Academy of Sciences University of Chinese Academy of Sciences

Charge transport processes involving the proton migration and electron transfer for different parts of membrane electrode assemble(MEA) play an essential role for developing the novel electrode and enhancing the electrochemical performance towards proton exchange membrane fuel cells(PEMFCs). However, the coupled charge transport processes make it difficult for evaluating proton conductivity and electronic conductivity of different parts in MEAs under operation conditions of fuel cells. Here in this work, we propose an experiment approach for separating the electronic conductivity and proton conductivity of different components of MEA at the operating conditions of PEMFCs. This approach involves two different measuring devices, which both consist of electron or proton conducting layers, sealing layers and sample layer, followed by tailoring the thickness of sample layers and via electrochemical impedance spectroscopy(EIS) to quantity the electronic conductivity and proton conductivity of different layers. These experiment results show the great potential in the development of different components of MEA.

关键词： Proton exchange membrane fuel cells Membrane electrode assembly Proton conductivity Electronic conductivity

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Thick Active-Layer Organic Solar Cells

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Chinese Journal of Chemistry 2023年第24期41卷 3739-3750页

作者： Zesheng Liu Tengfei Li Yuze Lin Beijing National laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China

Organic solar cells(OSCs)present a promising renewable energy technology due to their cost-effectiveness,adaptability,and lightweight *** advent of non-fullerene acceptors has further boosted their significance,allowing for power conversion efficiencies surpassing 19%even with an active layer thickness of about 100 ***,in order to achieve large scale production,it is necessary to fabricate OSCs with thicker active layers exceeding 300 nm that are compatible with large-area printing ***,OSCs with thick active layers have inferior performance compared to those with thin active *** expedite the transition of OSCs from laboratory to industrial high-throughput manufacturing,considerable efforts have been made to comprehend the performance limitations of thick active-layer OSCs,develop novel photoactive materials that are high-performance and tolerant towards the thickness of the active layer,and optimize the morphology of the photoactive layer and device *** review aims to provide a comprehensive summary of the mechanisms that lead to efficiency loss in thick active-layer OSCs,the representative works on molecular design,and the optimization strategies for high-performance thick active-layer OSCs,and the remaining challenges that must be addressed.

关键词： Organic solar cells Charge transport Charge extraction and recombination Thick active layer energy loss

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Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology

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Journal of energy Chemistry 2020年第7期29卷 8-15,I0001页

作者： Xiaojing Wan Ze Yu Wenming Tian Fuzhi Huang Shengye Jin Xichuan Yang Yi-Bing Cheng Anders Hagfeldt Licheng Sun State key laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesInstitute of Energy Science and TechnologyDalian University of Technology(DUT)Dalian 116024LiaoningChina State key laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State key laboratory of advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyLuoshi RoadWuhan 430070HubeiChina The Australian Centre for advanced Photovoltaics(ACAP) Monash UniversityVictoria 3800Australia laboratory of Photomolecular Science Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of TechnologyStockholm 10044

All-inorganic cesium lead bromide(CsPbBr3)perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb ***,the fabrication of high-quality CsPbBr3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common ***,we report a facile solution-processed approach to prepare high-quality CsPbBr3 perovskite films via a two-step spin-coating method,in which the Cs Br methanol/H2 O mixed solvent solution is spin-coated onto the lead bromide films,followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film *** this fashion,dense and uniform CsPbBr3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect *** effectiveness of the resulting CsPbBr3 films is further examined in perovskite solar cells(PSCs)with a simplified planar architecture of fluorine–doped tin oxide/compact Ti O2/CsPbBr3/carbon,which deliver a maximum power conversion efficiency of 8.11%together with excellent thermal and humidity *** present work offers a simple and effective strategy in fabrication of high-quality CsPbBr3 films for efficient and stable PSCs as well as other optoelectronic devices.

关键词： All-inorganic perovskite solar cells CsPbBr3 Morphology control Solution-processed Stability

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Optimizing band structure of CoP nanoparticles via rich-defect carbon shell toward bifunctional electrocatalysts for overall water splitting

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Carbon energy 2023年第3期5卷 112-125页

作者： Juncheng Wu Zhe‐Fan Wang Taotao Guan Guoli Zhang Juan Zhang Jie Han Shengqin Guan Ning Wang Jianlong Wang Kaixi Li cas key laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuanShanxiPR China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingPR China Institute energy Innovation College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuanShanxiPR China

Transition-metal phosphides(TMPs)with high catalytic activity are widely used in the design of electrodes for water ***,a major challenge is how to achieve the trade-off between activity and stability of ***,a novel method for synthesizing CoP nanoparticles encapsu-lated in a rich-defect carbon shell(CoP/DCS)is developed through the self-assembly of modified polycyclic aromatic *** graft and removal of high-activity C-N bonds of aromatic molecules render the controllable design of crystallite defects of carbon *** density functional theory calculation indicates that the carbon defects with unpaired electrons could effectively tailor the band structure of *** from the improved activity and corrosion resistance,the CoP/DCS delivers outstanding difunctional hydrogen evolution reaction(88 mV)and oxygen evolution reaction(251 mV)performances at 10 mA cm^(−2)current ***,the coupled water electrolyzer with CoP/DCS as both the cathode and anode presents ultralow cell voltages of 1.49 V to achieve 10 mA cm^(−2)with long-time *** strategy to improve TMPs electrocatalyst with rich-DCS and heterogeneous structure will inspire the design of other transition metal compound electrocatalysts for water splitting.

关键词： band structure bifunctional electrocatalysts CoP nanoparticles overall water splitting rich‐defect carbon

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Singlet fission and its application in organic solar cells

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Journal of Semiconductors 2022年第8期43卷 1-6页

作者： Yamin Zhang Zuo Xiao Liming Ding Hao-Li Zhang State key laboratory of Applied Organic Chemistry Key Laboratory of Special Function Materials and Structure Design(MoE)College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Tianjin key laboratory of Molecular Optoelectronic Sciences Collaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300072China Center for Excellence in Nanoscience(cas) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Enhancing the power conversion efficiency(PCE)is the major task in the development of solar cells[1−5].In 1961,William Shockley and Hans *** pointed out that the highest PCE for a single-junction solar cell is limited to 31%due to the thermalization and transmission losses[6].Singlet fission(SF)is an appealing carrier-multiplication approach to break the Shockley-Queisser limit,since it converts one high-energy singlet exciton into two low-energy triplet ***,one absorbed photon generates two electron-hole pairs.

关键词： limit convert singlet

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Silicon-based optoelectronics:progress towards large scale optoelectronic integration and applications

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Frontiers of Optoelectronics 2022年第2期15卷 179-180页

作者： Dingshan Gao Zhiping Zhou Wuhan National laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State key laboratory of advanced Optical Communication systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

In the past half century,silicon-based microelectronics and optical fiber communication have triggered a far-reaching information technology revolution,which has moved human society into a high-speed information *** demand for communication capacity and speed is growing *** the other hand,data center and high-performance computing are facing bottlenecks of speed,bandwidth,and energy consumption of electrical interconnections.

关键词： interconnection optoelectronic communication

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