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Stable perovskite solar cells with efficiency of 22.6%via quinoxaline-based polymeric hole transport material

Science China Chemistry 2021年第11期64卷 2035-2044页

作者： Chenxing Lu Can Zhu Lei Meng Chenkai Sun Wenbin Lai Shucheng Qin Jinyuan Zhang Wenchao Huang Jiaqi Du Yiyang Wang Yongfang Li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemical Science University of Chinese Academy of SciencesBeijing100049China College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou450001China Department of Materials Science and Engineering Monash UniversityClaytonVIC3168Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan528216China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Poor stability of spiro-OMe TAD hole transport materials(HTMs)with dopant is a major obstacle for the commercialization of perovskite solar cells(pero-SCs).Herein,we demonstrate a series of quinoxaline-based D-A copolymers PBQ5,PBQ6 and PBQ10 as the dopant-free polymer HTMs for high performance *** D-A copolymers are composed of fluorothienyl benzodithiophene(BDTT)as D-unit,difluoroquinoxaline(DFQ)with different side chains as A-unit,and thiophene asπ-bridge,where the side chains on the DFQ unit are bi-alkyl for PBQ5,bi-alkyl-fluorothienyl for PBQ6,and alkoxyl for *** the three copolymers are adopted as the dopant-free HTM in the *** planar n-i-p structured pero-SCs based on(FAPb I_(3))_(0.98)(MAPb Br_(3))_(0.02)with PBQ6 HTM demonstrated the high power conversion efficiency(PCE)of 22.6%with Vocof1.13 V and FF of 80.8%,which is benefitted from the suitable energy level and high hole mobility of *** PCE of 22.6%is the highest efficiency reported in the n-i-p structured pero-SCs based on dopant-free D-A copolymer *** addition,the peroSCs show significantly enhanced ambient,thermal and light-soaking stability compared with the devices with traditional spiroOMe TAD HTM.

关键词： perovskite solar cells hole transport materials D-A copolymer difluoroquinoxaline stability

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Ionic Liquid-Grafted Mxene Composite Polymer Electrolytes for High-Performance Solid-state Batteries

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SSRN 2025年

作者： Li, Yu Qian, Zhi Qiu, Zhao-Dong Wang, Rui-Qing Wei, Mei-Tong Fei, An-Min Hu, Zhi-Yi Mohamed, Hemdan S.H. Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China Physics Department Faculty of Science Fayoum University El Gomhoria Street Fayoum63514 Egypt University of Namur NamurB-5000 Belgium

All-solid-state batteries (ASSBs) have obtained much attention due to the high energy density and security. At present, PEO-based solid-state batteries are considered to be one of the most promising candidates for high-performance ASSBs due to the excellent processability and good interfacial stability. However, low ionic conductivity and Li+ transference number seriously hinder their progress in practical applications. Here, a novel filler is developed by embedding ionic liquid (IL) grafted onto the surface of MXene to improve the electrochemical performance of PEO-based solid composite polymer electrolyte (MXene-IL-SPE) for ASSBs. The 2D MXene can significantly reduce the crystallinity of PEO, and the presence of IL not only enhances the dispersion of MXene in the polymer matrix, but also promotes the dissociation of lithium salts and anchors anions. As a result, the MXene-IL-SPE possesses high ionic conductivity (7.19 × 10-4 S cm-1) and Li+ transference number (0.51), together with wide electrochemical window (5.2 V) at 60 °C. The assembled LiFePO4|MXene-IL-SPE|Li full cell exhibits remarkable rate capability and exceptional capacity of 154.8 mAh g-1 over 120 cycles with an impressive 95.3% capacity retention at 0.5 C. This design opens up a new way to prepare high performance CPEs for ASSBs. © 2025, The Authors. All rights reserved.

关键词： Solid-state Batteries

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Recent advances in materials and device technologies for aqueous hybrid supercapacitors

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Science China Materials 2022年第1期65卷 10-31页

作者： Qiuyue Gui Deliang Ba Linpo Li Wenyi Liu Yuanyuan Li Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Aqueous hybrid supercapacitors(AHSCs)offer potential safety and eco-friendliness compared with conventional electrochemical energy storage devices that use toxic and flammable organic *** can serve as the bridge between aqueous batteries and aqueous supercapacitors by combining the advantages of high energy of the battery electrode and high power as well as long lifespan of the capacitive *** the past few decades,extensive research efforts have been devoted to developing advanced materials and fascinating device architectures for ***,further development related to the compatibilities between the battery-type electrode and capacitive electrode remains stagnant mainly due to discrepancy encountered in terms of reaction kinetics and *** review focuses on the recent progress made in the field of AHSCs via elucidating the main concepts on the design of battery and capacitive electrodes and emerging *** particular,ingenious AHSCs that possess either better flexibility toward materials selection or better device functionality such as those with“dual-ion”energy storage mechanism and non-polarity feature are also *** advances and unresolved issues in multivalent ion hybrid devices(in particular,zinc-ion AHSCs)are further ***,future research directions and challenges for AHSCs are presented,which are anticipated to deliver higher energy and demonstrate greater multifunctionalities for more breakthrough technology applications.

关键词： aqueous hybrid supercapacitors electrode materials electrolytes device technologies

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Voltage Prediction and Extrapolation in Complex Pem Fuel Cell Conditions Via Transfer Learning from Localized Data

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SSRN 2024年

作者： Zhu, Wenchao He, Tingwei Wu, Hangyu Yang, Yang Wei, Peng Xie, Changjun Xiong, Rui State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automation Wuhan University of Technology Wuhan430070 China Wuhan Industrial Technology Institute of Artificial Intelligence and New Energy Vehicles Wuhan430119 China Joint Laboratory for Advanced Energy Storage and Application School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China

Transfer learning effectively leverages knowledge from source tasks to mitigate the reliance on large datasets in data-driven fuel cell health state prediction methods. However, in practical applications, the significant variation in degradation data distribution across different fuel cell types and operating conditions hinders knowledge transfer between source and target domains. Moreover, the complex and variable operating conditions of PEMFCs pose additional challenges to accurate prediction and diagnosis. Accurately characterizing future fuel cell stacks degradation characteristics under complex conditions using limited data from specific operating conditions is crucial for effective fuel cell health monitoring. A TCN-GRU-based transfer learning architecture is proposed to enable the transfer of knowledge from quasi-dynamic data to dynamic conditions. This approach reduces time costs by 41.56% and increases accuracy by 48.29%. Its generalization capability is thoroughly demonstrated across nine current levels in the activation and ohmic regions. Additionally, a voltage extrapolation method using Deep MMD is proposed. Based on limited data from specific operating conditions in the activation and ohmic regions, the proposed transfer learning method reconstructs voltage for future potential operating conditions, enabling precise characterization of fuel cell voltage degradation trends under unknown conditions, providing comprehensive insights for fuel cell operation. © 2024, The Authors. All rights reserved.

关键词： Extrapolation

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Discovering the Role of Moisture in Spray-Coating High-Quality Perovskite Films Under Ambient Conditions

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SSRN 2023年

作者： Yu, Xinxin Mo, Yanping Li, Jing Ku, Zhiliang Xiao, Junyan Long, Fei Han, Liyuan Peng, Yong Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China College of Materials Science and Engineering Guilin University of Technology Guangxi Guilin541004 China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China

The effect of moisture on the crystallization and morphological control of spray-prepared Cs0.19FA0.81PbI2.5Br0.5 perovskite films is elucidated. Moisture in air functions to (1) enhance droplet spreading as a result of humidity-suppressed solvent evaporation;(2) solvate organic salts in conjunction with added water in the precursor solution to facilitate the penetration of organic salts into inorganic halide films and accelerate their interaction. These conjunct contributions, on the one hand, relieve inhomogeneous solute distribution and suppress the "coffee-ring effect", on the other hand, promote phase transition and improve the crystallinity of resultant perovskite, ultimately enabling the formation of high-quality Cs0.19FA0.81PbI2.5Br0.5 perovskite films with homogeneous morphology and good crystallization. The power conversion efficiency (PCE) of the champion perovskite solar cell increases from 18.25% to 19.74%, with improved thermal stability, maintaining 80% of its initial efficiency after operating at 50 °C for >800 h. The large-area perovskite film (10 × 10 cm2) exhibits significant uniformity over the entire film, and the corresponding devices exhibit high consistency and reproducibility. The average PCE of small-area devices employing the same large-area perovskite film is 19.53±0.25%. Mini-modules with an active area of 64.8 cm2 yield an optimal PCE of 16.75%, with an average PCE of 16.08±0.32%. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Controlled Incorporation of Zn into Nitrogen-Doped Porous Carbon Boosts the Alcohol Dehydrogenation to Carboxylic Acids

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SSRN 2024年

作者： Gu, Jun-Fei Chen, Cheng Chaemchuen, Somboon Sang, Wei Li, Xing-Chuan Yuan, Ye Kou, Zongkui Verpoort, Francis State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China 6 Miklukho-Maklaya Str. Moscow117198 Russia

The dehydrogenation of primary alcohols to carboxylic acids is a crucial process in chemical industries such as fibers and plastics. Carboxylic acids, the resulting products, are not only important chemical raw materials but also fundamental pharmaceutical intermediates. Zn-based catalysts have gained attention as a promising option for this transformation owing to their economic cost and abundant reserves. However, stability issues, including structure collapse and morphological changes, have plagued the reported Zn-based catalysts during this transformation. In response to these challenges, this study focused on the design and development of Zn-based catalysts via controlled incorporation of Zn into nitrogen-doped porous carbon to modulate the numbers of defects and Lewis acid-base site pairs. Through extensive screening of various parameters, the best-performing catalyst, namely Zn@NC-800, exhibited high activity and remarkable stability, surpassing all the reported Zn-based catalysts. Moreover, this catalyst demonstrated great recyclability since it could maintain approximately 90% yields after 9 cycles. Notably, the product formation rate of this catalyst could reach 3833 μmol·gcat-1·h-1, exceeding that of most reported non-noble metal heterogeneous catalysts. Consequently, this study offers a promising approach for efficiently and stably catalyzing alcohol dehydrogenation reactions using non-noble metals. © 2024, The Authors. All rights reserved.

关键词： Carboxylic acids

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Impact of crystallinity on orbital torque generation in ferromagnets

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Physical Review B 2024年第14期109卷 144412-144412页

作者： Riko Fukunaga Satoshi Haku Tenghua Gao Hiroki Hayashi Kazuya Ando Department of Applied Physics and Physico-Informatics Keio University Yokohama 223-8522 Japan Keio Institute of Pure and Applied Sciences Keio University Yokohama 223-8522 Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Center for Spintronics Research Network Keio University Yokohama 223-8522 Japan

We investigate the impact of crystallinity on the generation of orbital torques in Ni, which is predicted to exhibit the strongest orbital response among conventional 3d ferromagnetic metals. We show that the current-induced torques in Hf/Ni bilayers are primarily dominated by the orbital torque, arising from the orbital Hall effect in the Hf layer. We find that the orbital torque efficiency is enhanced by a factor of 2 when the stacking order of the Hf/Ni bilayer is altered. Through the examination of bulk and interfacial structural properties of the Ni and Hf layers, and by quantifying the torque efficiency in a symmetric Hf/Ni/Hf trilayer, we show that the orbital torque efficiency is strongly dependent on the crystallinity of the Ni layer. This dependence is in stark contrast to conventional spin-orbit torques, which arise from the spin Hall effect and are typically insensitive to the crystallinity of the ferromagnetic layer. These findings highlight the significant role of the crystalline structure of the ferromagnetic layer in its orbital response and illustrate the potential of crystal structure engineering in optimizing orbital torques.

关键词： Magnetization dynamics Spin current Spin-orbit coupling Spin-orbit torque Spintronics

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Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO_(2) single crystals

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Fundamental Research 2022年第3期2卷 456-461页

作者： Meng Ran Chao Zhao Xiang Xu Xiao Kong Younghee Lee Wenjun Cui Zhi-Yi Hu Alexander Roxas Zhengtang Luo Huiqiao Li Feng Ding Lin Gan Tianyou Zhai State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Centre for Multidimensional Carbon Materials Institute for Basic ScienceSchool of Materials Science and EngineeringUlsan National Institute of Science and TechnologyUlsanSouth Korea Center for Integrated Nanostructure Physics Institute for Basic ScienceSungkyunkwan UniversitySuwonSouth Korea State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CentreWuhan University of TechnologyWuhan 430074China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

In-plane anisotropy(IPA)due to asymmetry in lattice structures provides an additional parameter for the precise tuning of characteristic polarization-dependent properties in two-dimensional(2D)materials,but the narrow range within which such method can modulate properties hinders significant development of related *** we present a novel periodic phase engineering strategy that can remarkably enhance the intrinsic IPA obtainable from minor variations in asymmetric *** introducing alternant monoclinic and rutile phases in 2D VO_(2)single crystals through the regulation of interfacial thermal strain,the IPA in electrical conductivity can be reversibly modulated in a range spanning two orders of magnitude,reaching an unprecedented IPA of *** an intriguing local phase engineering in 2D materials can be well depicted and predicted by a theoretical model consisting of phase transformation,thermal expansion,and friction force at the interface,creating a frame-work applicable to other 2D ***,the considerable adjustability and reversibility of the presented strategy provide opportunities for future polarization-dependent photoelectric and optoelectronic devices.

关键词： Periodic phase engineering Two-dimensional VO_(2) Interfacial strain In-plane anisotropy Electrical anisotropy Chemical vapor deposition

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Wetting Tunning of Al/B4c Interface Through Constructing Periodic Surface Structures Via Femtosecond Laser

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SSRN 2023年

作者： Chen, Beidi Chai, Nianyao Zhang, Jinyong Ren, Lin Wang, Weimin Zhang, Fan Wang, Xuewen Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Hubei Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Science Wuhan University of Technology Wuhan430070 China

Nowadays, femtosecond laser processing can realize the specialized surface of materials to be applied to different functional fields. However, there are few reports on the application of laser processing super-hard ceramics. In this study, a study on the phase change and surface morphology of boron carbide ceramic samples after femtosecond laser processing was explored. After femtosecond laser processing with certain parameters, ordered periodic micro nano structures can be realized on the surface of boron carbide. According to XRD, femtosecond laser can promote the formation of boron rich structure. Raman showed that carbon can be knocked out by femtosecond laser to form boron rich boron carbide and a little tensile stress occurs on the material surface without affecting the mechanical properties. Moreover, the contact angle of boron carbide after processing and aluminum melt is 24 ° smaller than that of untreated one, which means that femtosecond laser processing can improve the wetting between boron carbide and aluminum. © 2023, The Authors. All rights reserved.

关键词： Boron carbide

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Quantum dots assisted in vivo two-photon microscopy with NIR-Ⅱemission

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Photonics Research 2022年第1期10卷 189-196页

作者： HUWEI NI YALUN WANG TAO TANG WENBIN YU DONGYU LI MUBIN HE RUNZE CHEN MINGXI ZHANG JUN QIAN State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China SIEE(Sussex AI Institute) Zhejiang Gongshang UniversityHangzhou 310018China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

With the advantages of high resolution and deep penetration depth,two-photon excited NIR-Ⅱ(900–1880 nm)fluorescence(2PF)microscopic bioimaging is ***,due to the lack of imaging systems and suitable probes,few such works,to our best knowledge,were demonstrated utilizing NIR-II excitation and NIR-Ⅱfluorescence ***,we used aqueously dispersible Pb S/Cd S quantum dots with bright NIR-II fluorescence as the contrast *** the excitation of a 1550 nm femtosecond(fs)laser,they emitted bright 2 PF in the NIR-Ⅱ***,a 2PF lifetime imaging microscopic(2PFLIM)system was implemented,and in vivo 2PFLIM images of mouse brain blood vessels were obtained for the first time to our best *** improve imaging speed,an in vivo two-photon fluorescence microscopy(2 PFM)system based on an In Ga As camera was implemented,and in vivo 2PFM images of QDs-stained mouse brain blood vessels were obtained.

关键词： excitation photon system

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