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Chinese Chemical Letters 2024年第2期35卷 534-538页

作者： Bing Jiang Hao li Bi Luo Lehao liu lihua Chu Qiaobao Zhang meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China

Boosting the interfacial stability between electrolyte and li-rich cathode material at high operating voltage is vital important to enhance the cycling stability of li-rich cathode materials for high-performance li-ion *** this work,vinyltrimethylsilane as a new type of organic silicon electrolyte additive is studied to address the interfacial instability of li-rich cathode material at high operating *** cells using vinyltrimethylsilane additive shows the high capacity retention of 73.9%after 300 cycles at 1 C,whereas the cells without this kind of additive only have the capacity retention of 58.9%.The improvement of stability is mainly attributed to the additive helping to form a more stable surface film for li-rich cathode material,thus avoiding direct contact between the electrolyte and the cathode material,slowing down the dissolution of metal ions and the decomposition of the electrolyte under high operating *** findings in this work shed some light on the design of stable cycling performance of li-rich cathode toward advanced li-ion batteries.

关键词： Vinyltrimethylsilane Electrolyte additive li-rich cathode Interfacial stability Capacity retention

Nanostructured AlFeO_(3) thin films as a novel photoanode for photoelectrochemical water splitting

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Nano Research 2024年第3期17卷 1075-1085页

作者： Xin Sun Min Wang Qi Geng Shuailin Chen Xiaojun Lv Xunlei Ding meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

The earth-abundant and robust aluminum ferrite,AlFeO_(3)(AFO),is mainly studied in the context of ***,we demonstrate that AFO can be used as a stable solar absorber in photoelectrochemical cells for solar water splitting,exhibiting attractive *** is the first report on the photoelectrochemical activity of *** thin-film photoelectrodes prepared by solution-processing methods are composed of vertically oriented thin nanosheets,featuring the rhombohedral symmetry(R3c)and n-type *** as-prepared AFO photoanodes generate a photocurrent density of+0.78 mA·cm^(-2) at 1.23 V *** hydrogen electrode(RHE)with the photocurrent _(onset) potential(U_(onset))close to the flat band potential of 0.5 V *** in the presence of hole ***,the U_(onset) of AFO for solar water splitting coincides with the flat band potential as well,which is rare in n-type inorganic *** also report other properties of AFO associated with photoelectrochemical *** films exhibit a band gap energy of 2.31 eV and positive band edges with low ***,the carrier lifetimes in AFO films are up to millisecond timescales under the mediation of defect *** on the photoelectrochemical behavior and optoelectronic properties,we believe that AFO has great potential for application in photoelectrochemical cells.

关键词： AlFeO_(3) photoanode nanosheets photoelectrochemistry onset potential

liPO_(2)F_(2) electrolyte additive for high-performance li-rich cathode material

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Journal of Energy Chemistry 2021年第9期30卷 564-571页

作者： Bing Jiang Jingru li Bi Luo Qizhang Yan Hao li Lehao liu lihua Chu Yingfeng li Qiaobao Zhang meicheng li School of New Energy North China Electric Power UniversityBeijing 102206China Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina Department of NanoEngineering University of CaliforniaSan DiegoLa JollaCA 92093United States

li-rich layered oxide cathodes have received considerable attention because of the high operating potential and specific capacity. However, the structural instability and parasitic reactions at high potential cause severe degradation of the electrochemical performance. In our studies, the cycling stability of li_(1.14)Ni_(0.133)Co_(0.133)Mn_(0.544)O_(2) cathode is improved with liPO_(2)F_(2) electrolyte additive. After 500 cycles, the capacity retention is increased from 53.6% to 85% at 3 C by liPO_(2)F_(2) modification. This performance is mainly attributed to the enhanced interfacial stability of the li-rich cathode. Based on systematic characterization, liPO_(2)F_(2) additive was found to promote a stable interface film on the cathode surface during the cycling and mitigates the interfacial side reactions. This study provides new insights for improving high-potential li-rich layered oxide batteries.

关键词： li-rich cathode Cathode electrolyte interface liPO_(2)F_(2) High energy density

In-situ Observation of Crack Growth and Domain Switching Around Vickers Indentation on BaTiO_3 Single Crystal Under Sustained Electric Field

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Acta Metallurgica Sinica(English Letters) 2013年第6期26卷 772-776页

作者： Bing JIANG Yusong liU meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Renewable EnergyNorth China Electric Power University Beijing Sustainable Development Center

The crack propagation and domain switching process around the indentation on the surface of barium titanate single crystal under the external electric field was investigated by atomic force microscope and polarized light microscope. The evolutions of domain switching and crack propagation were in-situ observed when a 90°a- c domain wall moved across the indentation which was driven by external electric field. The results show that the incompatible strain induced by domain switching in the residual stress zone around the indentation is the driving force of the anisotropic crack propagation. The crack propagation results in the changes of the fine domain stripes around the crack tip.

关键词： Domain switching Indentation Crack propagation BaTiO3 AFM

Preface to the SPECI AL ISSUE: Excitonic Solar Cells(Ⅰ)

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Science China Materials 2016年第10期59卷 701-702页

作者： Jianjun Tian meicheng li Kaibo Zheng Advanced Material and Technology Institute University of Science and TechnologyChina School of Renewable Energy North China Electric Power University Division of Chemical Physics Lund University

Search and development of clean sustainable energy or renewable energy become an imperative demand beyond the concerns of limited resource and cost of fossil fuels that our modern life is so much dependent *** all the renewable energy,solar energy is the most abundant and likely to make the most significant contribution to the clean energy *** the usage of solar energy has

关键词： Excitonic Solar Cells Preface to the SPECI AL ISSUE

Excellent light-capture capability of trilobal SiNW for ultra-high JSC in single-nanowire solar cells

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光子学研究：英文版 2020年第6期8卷 995-1001页

作者： ZHONGliANG GAO GUILU lin YUPENG ZHENG NA SANG YINGFENG li LEI CHEN meicheng li State Key Laboratory o f Alternate Electrical Power System with Renewable Energy Sources School of Renewable EnergyNorth China Electric Power UniversityBeijing 102206China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

Single-.nanowire solar cells with a unique light-concentration property are expected to exceed the Shockley-Queisser *** architecture of single nanowire is an important factor to regulate its optical *** designed a trilobal silicon nanowire(SiNW)with two cquivalent scales that possesses superior light-absorption efficiency in the whole wavelength range and shows good tolerance for incident *** electric field distribution in this geometry is concentrated in the blade with small equivalent scale and pivot with large equivalent scale,respectively,in the short wavelength range and long wavelength *** good light absorption of trilobal SiNW in the two wavelength ranges leads to stronger total light absorption capacity than that of cylindrical *** single nanowire solar cells can obtain a short-circuit current density(JSC)of 647 mA·cm^2,which provides a new choice for designing single nanowire with excellent light-capture capability.

关键词： light absorption cylindrical

Resistive-type sensors based on few-layer MXene and SnO_(2)hollow spheres heterojunctions:Facile synthesis,ethanol sensing performances

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中国化学快报:英文版 2023年第8期34卷 502-507页

作者： lihua Chu Hao Yan Wanfeng Xie Yuxin Shi Muhammad Hilal Changxu Sun Ze li meicheng li School of New Energy North China Electric Power UniversityBeijing 102206China College of Electronics and Information University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao 266071China Department of Physics Dongguk UniversitySeoul 04620Republic of Korea

High-performance and low-cost gas sensors are highly desirable and involved in industrial production and environmental *** combination of highly conductive MXene and metal oxide materials is a promising strategy to further improve the sensing *** this study,the hollow SnO_(2)nanospheres and few-layer MXene are assembled rationally via facile electrostatic synthesis processes,then the SnO_(2)/Ti_(3)C_(2)T_(x)nanocomposites were *** with that based on either pure SnO_(2)nanoparticles or hollow nanospheres of SnO_(2),the SnO_(2)/Ti_(3)C_(2)T_(x)composite-based sensor exhibits much better sensing performances such as higher response(36.979),faster response time(5 s),and much improved selectivity as well as stability(15 days)to 100ppm C2H5OH at low working temperature(200°C).The improved sensing performances are mainly attributed to the large specific surface area and significantly increased oxygen vacancy concentration,which provides a large number of active sites for gas adsorption and surface catalytic *** addition,the heterostructure interfaces between SnO_(2)hollow spheres and MXene layers are beneficial to gas sensing behaviors due to the synergistic effect.

关键词： Heterostructure Few-layer MXene SnO_(2)hollow spheres Ethanol sensor Synergistic effect SnO_(2)/Ti_(3)C_(2)T_(x)composites

Comprehensively-modified polymer electrolyte membranes with multifunctional PMIA for highly-stable all-solid-state lithium-ion batteries

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Journal of Energy Chemistry 2020年第9期29卷 334-343,I0010页

作者： Lehao liu Jinshan Mo Jingru li Jinxin liu Hejin Yan Jing Lyu Bing Jiang lihua Chu meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Renewable EnergyNorth China Electric Power UniversityBeijing 102206China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123JiangsuChina

Polyethylene oxide(PEO)-based electrolytes have obvious merits such as strong ability to dissolve salts(e.g.,liTFSI)and high flexibility,but their applications in solid-state batteries is hindered by the low ion conductance and poor mechanical and thermal ***,poly(m-phenylene isophthalamide)(PMIA)is employed as a multifunctional additive to improve the overall properties of the PEO-based *** hydrogen-bond interactions between PMIA and PEO/TFSI-can effectively prevent the PEO crystallization and meanwhile facilitate the liTFSI dissociation,and thus greatly improve the ionic conductivity(two times that of the pristine electrolyte at room temperature).With the incorporation of the high-strength PMIA with tough amide-benzene backbones,the PMIA/PEO-liTFSI composite polymer electrolyte(CPE)membranes also show much higher mechanical strength(2.96 MPa),thermostability(4190℃)and interfacial stability against li dendrites(468 h at 0.10 mA cm-2)than the pristine electrolyte(0.32 MPa,364℃and short circuit after 246 h).Furthermore,the CPE-based liFePO4/li cells exhibit superior cycling stability(137 mAh g^-1 with 93%retention after 100 cycles at 0.5 C)and rate performance(123 mAh g^-1 at 1.0 C).This work provides a novel and effective CPE structure design strategy to achieve comprehensively-upgraded electrolytes for promising solid-state battery applications.

关键词： Poly(m-phenylene isophthalamide) Composite polymer electrolyte Ion conductance Mechanical strength Solid-state battery

Designing novel thin film polycrystalline solar cells for high efficiency:sandwich CIGS and heterojunction perovskite

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Journal of Semiconductors 2017年第1期38卷 71-76页

作者： Tianyue Wang Jiewei Chen Gaoxiang Wu Dandan Song meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Chongqing Materials Research Institute Chongqing 400707China

Heterojunction and sandwich architectures are two new-type structures with great potential for solar ***,the heterojunction structure possesses the advantages of efficient charge separation but suffers from band offset and large interface recombination;the sandwich configuration is favorable for transferring carriers but requires complex fabrication ***,we have designed two thin-film polycrystalline solar cells with novel structures：sandwich CIGS and heterojunction perovskite,referring to the advantages of the architectures of sandwich perovskite（standard）and heterojunction CIGS（standard）solar cells,respectively.A reliable simulation software wxAMPS is used to investigate their inherent characteristics with variation of the thickness and doping density of absorber *** results reveal that sandwich CIGS solar cell is able to exhibit an optimized efficiency of 20.7%,which is much higher than the standard heterojunction CIGS structure（18.48%）.The heterojunction perovskite solar cell can be more efficient employing thick and doped perovskite films（16.9%）than these typically utilizing thin and weak-doping/intrinsic perovskite films（9.6%）.This concept of structure modulation proves to be useful and can be applicable for other solar cells.

关键词： sandwich CIGS solar cell heterojunction perovskite solar cell simulation wxAMPS

Research progress in improving the performance of PEDOT:PSS/Microand Nano-textured Si heterojunction for hybrid solar cells

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Journal of Materiomics 2021年第5期7卷 1161-1179页

作者： Guilu lin Zhongliang Gao Ting Gao Yongcong Chen Qi Geng Yingfeng li Lei Chen meicheng li School of Mathematics and Physics North China Electric Power UniversityBeijing102206China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing102206China

Silicon-based hybrid solar cells(HSCs),especially PEDOT:PSS/Si HSC,have attracted the interest of researchers because they combine the advantages of organic and inorganic materials.A high quality PEDOT:PSS/Si heterojunction is the key to the good performance of PEDOT:PSS/Si ***,as generally requisite to enhance light absorption for HSCs,Si Micro/Nano structures will reduce the interface contact quality between PEDOT:PSS and Si *** inferior interface contact quality will limit the separation efficiency of the photogenerated *** this paper,we summarize the research progress in improving the interface contact between Si Micro/Nano structures and PEDOT:PSS film from three aspects:the optimization of Si Micro/Nano structures aimed to improve the fluid properties of PEDOT:PSS solution,the material modification of PEDOT:PSS and interface modification with the purpose to enlarge the heterojunction area and improve the electrical contact,and the specific deposition process of PEDOT:PSS solution developed to achieve the high filling rate of PEDOT:PSS on Si Micro/Nano *** insight of this paper is helpful for the preparation of high-quality heterojunction,which is vitally important for the development of high efficiency PEDOT:PSS/Si HSCs.

关键词： PEDOT:PSS/Si heterojunction Si Micro/Nano structures Interface modification Deposition method of PEDOT:PSS