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Rational synthesis of Cylindrical Silver Single-crystalline Nanowires via Poly(vinyl pyrrolidone) Reduction of AgCl

Journal of Wuhan University of technology(materials Science) 2020年第3期35卷 473-481页

作者： DUAN Junyuan YANG Rui HAN Meng LIU Bingxin WANG Yilong GUAN Jianguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Mechanical Engineering Qinghai UniversityXining 810016China

We presented a simple yet convenient hydrothermal approach for the large-scale synthesis of uniform cylindrical silver (Ag) single-crystalline nanowires with diameters of about 25 nm and lengths of 1-4 μm. Poly(vinyl pyrrolidone) (PVP) was used as a reducing agent, and AgCl was used as a precursor to deliberately control [Ag^+] at a low degree in the overall reaction process through its dynamic equilibrium by directly reducing AgCl with PVP at a quasi-equilibrium growth condition. The as-obtained products were characterized by powder X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectra (IR) and Raman spectra. Factors such as [PVP], reaction temperature, time, and species of reducing agents and precursors were investigated to have strong influences on the morphologies and structures of the resultant Ag nanostructures. The wire diameter can conveniently be adjusted between 25 and 50 nm by simply adjusting [PVP], reaction temperature and reducing agent species. The as-synthesized silver nanowires can be self-assembled into perfect order arrays after being dried on tin foil due to the PVP coating on the surface, the circular cross-section and the uniform diameter of the Ag nanowires. These special silver nanowires with a core-shell structure as well as their spontaneous self-assembly of order arrays are expected to provide potential applications in flexible conductors, dielectric materials, electromagnetic shielding materials and nano-devices.

关键词： silver nanowires poly(vinyl pyrrolidone) hydrothermal approach self-assembly

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Binary solvent engineering and CFPy/perovskite interface modification strategy in spray-coating for fabricating large-area high-quality hole transport layer

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materials Today Chemistry 2025年 46卷

作者： Zhao, Xin Ruan, Danlin Zhu, Mingwei Song, Jiawei Cheng, Jiahao Shen, Wenjian Li, Wangnan Liang, Guijie Liang, Ying Peng, Yong Li, Bin Cheng, Yi-Bing Hubei Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Machine X Technology Co. Ltd. Zhejiang 314211 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou730050 China

The high-quality and coverage of sprayed Spiro-OMeTAD layer on perovskite (PVSK) films is a significant challenge for the state-of-the-art perovskite solar cells (PSCs). In this work, the green mixed solvent system consisting of ethyl acetate (EA) and n-propyl acetate (NPA) was introduced to regulate the Spiro-OMeTAD solution properties. It was found that the rapid evaporation nature of EA/NPA mixed solvents significantly improves the coverage rate of sprayed Spiro-OMeTAD under ambient conditions. Besides, the introduction of 2-chloro-6-trifluoromethyl-3-aminopyridine (CFPy) further enhances the PVSK/Spiro-OMeTAD interface by improving the wettability of Spiro-OMeTAD solution on PVSK films, leading to a notable increase in Spiro-OMeTAD coverage by 39.5 %. With the increased coverage, the charge transport efficiency at PVSK/Spiro-OMeTAD interface was enhanced from 2.07 × 10−3 cm2 V−1 s−1 to 7.32 × 10−3 cm2 V−1 s−1. The CFPy was proved to reduce the migration rates of halide ions from the PVSK films to Spiro-OMeTAD layer, which can be attributed to the formation of hydrogen bonds between the –NH2 group in CFPy and free iodide (I−) and bromide (Br−) ions. Ultimately, it was confirmed that high-quality Spiro-OMeTAD films can be sprayed onto PVSK film under ambient conditions with this interface modification strategy. The PSCs fabricated using the evaporation-spraying technique achieved a power conversion efficiency (PCE) of 19.67 %. Under 1 sun AM 1.5G illumination at 26 °C and 30 %–40 % relative humidity (RH), the devices maintained 80 % of their initial efficiency after 500 h of continuous light exposure. Furthermore, a 10 × 10 cm2 sub-module (with an active area of 63 cm2) fabricated using this technique achieved a PCE of 15.54 %. © 2025 Elsevier Ltd

关键词： Cell engineering

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Non-equivalent D-A copolymerization strategy towards highly efficient polymer donor for polymer solar cells

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Science China Chemistry 2021年第6期64卷 1031-1038页

作者： Ziya Shang Liuyang Zhou Chenkai Sun Lei Meng Wenbin Lai Jinyuan Zhang Wenchao Huang Yongfang Li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 455001China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528216China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

D-A copolymerization is a broadly utilized molecular design strategy to construct high efficiency photovoltaic materials for polymer solar cells(PSCs),and all the D-A copolymer donors reported till now are the alternate D-A copolymers with equal D-and ***,we first propose a non-equivalent D-A copolymerization strategy with unequal D-and A-units,and develop three novel non-equivalent D-A copolymer donors(PM6-D1,PM6-D2 and PM6-D3 with D/A unit ratio of 1.1:0.9,1.2:0.8 and1.3:0.7,respectively)by inserting more D units into the alternate D-A copolymer PM6 backbone to finely tune the physicochemical and photovoltaic properties of the *** three non-equivalent D-A copolymers show the down-shifted highest occupied molecular orbital(HOMO)energy levels,higher hole mobility,higher degree of molecular self-assembly and higher molecular crystallinity with the increase of D-unit ratio in comparison with the alternate D-A copolymer *** a result,all the three non-equivalent D-A copolymer-based PSCs with Y6 as acceptor achieve improved power conversion efficiency(PCE)with higher V_(oc),larger J_(sc)and higher FF ***,the PM6-D1:Y6 based PSC achieved a high PCE of17.71%,which is significantly higher than that(15.82%)of the PM6:Y6 based PSC and is one of the highest performances in the binary PSCs.

关键词： polymer solar cells conjugated polymer donor materials donor-acceptor copolymers non-equivalent D-A copolymerization

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Engineering Mesoporous Structure in Amorphous Carbon Boosts Potassium Storage with High Initial Coulombic Efficiency

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Nano-Micro Letters 2020年第11期12卷 39-50页

作者： Ruiting Guo Xiong Liu Bo Wen Fang Liu Jiashen Meng Peijie Wu Jinsong Wu Qi Li Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China

Amorphous carbon shows great potential as an anode material for high-performance potassium-ion batteries;however,its abundant defects or micropores generally capture K ions,thus resulting in high irreversible capacity with low initial Coulombic efficiency(ICE)and limited practical ***,pore engineering via a facile self-etching strategy is applied to achieve mesoporous carbon(meso-C)nanowires with interconnected *** and evenly distributed mesopores could provide short K^+ pathways for its rapid *** to microporous carbon with highly disordered structure,the meso-C with Zn-catalyzed short-range ordered structure enables more K^+to reversibly intercalate into the graphitic ***,the mesoC shows an increased capacity by ~100 mAh g^-1 at 0.1 A g^-1,and the capacity retention is 70.7% after 1000 cycles at 1 A g^-*** in/ex situ characterizations reveal the reversible structural changes during the charging/discharging ***,benefiting from the mesoporous structure with reduced specific surface area by 31.5 times and less defects,the meso-C generates less irreversible capacity with high ICE up to 76.7%,one of the best reported values so *** work provides a new perspective that mesopores engineering can effectively accelerate K^+ diffusion and enhance K^+ adsorption/intercalation storage.

关键词： Potassium-ion battery Mesopores engineering Storage mechanism Initial Coulombic efficiency

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A universal tactic of using Lewis-base polymer-CNTs composites as additives for high performance cm2-sized and flexible perovskite solar cells

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Science China Chemistry 2021年第2期64卷 281-292页

作者： Chang Liu Jingsong Sun Xiao-Fang Jiang Like Huang Qiang Lou Yi-Bing Cheng Shulin Song Ziyi Ge Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China Department of Materials Science and Engineering Monash UniversityClaytonVictoria3800Australia School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou510006China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Lewis-base polymers have been widely utilized as additives to act as a template for the perovskite nucleation/crystal growth and passivate the under-coordinated Pb2+ ***,it is uncovered in this work that the polymer on the perovskite grain boundaries would significantly hinder the charge transport due to its low conductivity,which brings about free carrier recombination and photocurrent *** circumvent this issue while fully exploiting the benefits of polymers in passivating the trap states in perovskite,we incorporate highly conductive multiwall carbon nanotubes(CNTs) with Lewis-base polymers as coadditives in the perovskite *** the CNTs with-COOH group enables a selective hole-extraction and charge transport from perovskite to the hole transporting materials(HTM).By studying the charge transporting and recombination dynamics,we revealed the individual role of the polymer and CNTs in passivating the trap states and facilitating the charge transport,*** a result,the perovskite solar cells(PSCs) with polymer-CNTs composites exhibit an impressive PCE of 21.7% for a small-area device(0.16 cm2) and 20.7% for a large-area device(1.0 cm2).Moreover,due to the superior mechanical flexibility of both polymer and CNTs,the polymer-CNTs composites incorporation in the perovskite film encourages the fabrication of flexible PSCs(f-PSCs) with an impressive PCE of 18.3%,and a strong mechanical durability by retaining 80%of the initial PCE after 1,000 times *** addition,we proved that the selection criteria of the polymers can be extended to other long-chain Lewis-base polymers,which opens new possibilities in design and synthesis of inexpensive material for this tactic towards the fabrication of high performance large-area PSCs and f-PSCs.

关键词： passivation charge transport flexible perovskite solar cells

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Microstructure,Mechanical,and Thermal Properties of B4C-TiB2-SiC Composites Prepared by Reactive Hot-pressing

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Journal of Wuhan University of technology(materials Science) 2020年第6期35卷 1031-1037页

作者： CAO Yaoqin HE Qianglong WANG Weimin China Helicopter Research and Development Institute Tianjin 300450China The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

B4C-TiB2-SiC composites with excellent properties were prepared by reactive hot-pressing using B4C,TiC,and Si powders as the raw *** phase transition process was investigated by heating the powder mixture to different temperatures and combined with XRD ***2 and SiC phases were synthesized through an in situ reaction,and the mechanical and thermal properties were improved *** and mechanical properties were also studied,and the 60wt% B4C-21.6wt% TiB2-18.4wt% SiC composite showed a relative density of 99.1%,Vickers hardness of 34.6 GPa,flexural strength of 582 MPa,and fracture toughness of 5.08 MPa·m1/*** addition,the values of thermal conductivity and thermal expansion coefficient were investigated,respectively.

关键词： B4C-TiB2-SiC reactive hot pressing microstructures mechanical properties thermal properties

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Microstructure and Oxidation Resistance of V Thin Films Deposited by Magnetron Sputtering at Room Temperature

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Journal of Wuhan University of technology(materials Science) 2020年第5期35卷 879-884页

作者： ZHANG Song ZHANG Ziyu LI Jun TU Rong SHEN Qiang WANG Chuanbin LUO Guoqiang ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China National Key Laboratory for Shock Wave and Detonation Physics Institute of Fluid PhysicsMianyang 621900China

Vanadium films were deposited on Si(100)substrates at room temperature by direct current(DC)magnetron *** microstructure and surface morphology were studied using scanning electron microscopy(SEM)and atomic force microscope(AFM).The oxidation resistance of films in air was studied using X-ray photoelectron spectroscopy(XPS)and transmission electron microscopy(TEM).The results showed that the amorphous vanadium film with a flatter surface had higher oxidation resistance than the crystalline film when exposed to *** rapid formation of the thin oxide layer of amorphous vanadium film could protect the film from sustained oxidation,and the relative reasons were discussed.

关键词： vanadium films magnetron sputtering sputtering power(Ps) microstructure oxidation resistance

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Effect of pH, milling time, and Isobam content on porous silicon nitride ceramics prepared by gel casting

Advanced Powder Materials

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advanced Powder materials 2023年第1期2卷 100-107页

作者： Hailing Yang Zhi Wang Mengyong Sun Fei Chen Jun Ji Sique Chen Yingying Chen Deli Ma Zhenyu Zhang Baocai Pan Yulin Wei Qinggang Li Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan 250022China School of Material Science and Engineering University of JinanJinan 250022China No.52 Institute of China North Industry Group Yantai 264003China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

As a non-toxic copolymer of isobutylene and maleic anhydride,Isobam is successfully used as a dispersant and a gelling agent for fabricating porous Si_(3)N_(4) ceramics by gel *** dispersity and rheological properties of the Si_(3)N_(4) slurry are influenced by the pH,milling time,and Isobam content which varies from 0.1 wt.%to 0.6 wt.%,and these factors are *** slurry with 40 vol.%solid content and milled for 4 h has a high zeta potential at pH 12(adjusted by Tetramethyl ammonium hydroxide(TMAH)),which means that the particles are well *** mechanisms of TMAH are electrostatic repulsion and steric *** viscosity of the slurry increases with the increase of Isobam *** pressureless sintering at 1700℃ for 2 h,a uniform unique interlocking microstructure of rod-like β-Si_(3)N_(4) grains is observed,which may improve the flexural strength of the ceramics by intergranular fracture and particle pullout of β-Si_(3)N_(4) *** density and porosity of the samples fluctuate negligibly with the increase of Isobam content,and the Si_(3)N_(4) ceramic with 0.1 wt.% Isobam exhibits the highest bending strength of 251.6 MPa among all samples.

关键词： Si_(3)N_(4)ceramics Viscosity Zeta potential Gel casting Isobam

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Binder-free electrodes for advanced potassium-ion batteries:A review

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Chinese Chemical Letters 2021年第4期32卷 1299-1308页

作者： Wencong Liu Wenyi Liu Yuqi Jiang Qiuyue Gui Deliang Ba Yuanyuan Li Jinping Liu School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal University.Harbin 150025China

Potassium-ion batteries(PIBs)have attracted enormous attention due to the abundance of potassium resources,low cost,fast ionic conductivity of electrolyte and relatively high operating *** great effo rts and progress,researches on PIBs are still at the initial stage,especially in the emerging field of flexible and wearable *** inevitable challenges for PIBs include low reversible capacity,unsatisfactory cycling stability and insufficient energy density,the solution to which mostly relies on designing adva nced ***-free electrodes have emerged as promising electrode architecture for *** electrodes avoid the use of insulating binders,which can be designed with various synergistic functional materials to address the aforementioned PIB issues and be endowed with flexibility/*** this review,we mainly summarize the recent progress on binde r-free electrodes for PIBs,with the focus on the methodologies,detailed strategies and functional materials for electrode *** strategy for binder-free electrodes is to assemble free-standing architecture with the help of carbon nanotubes(CNTs),graphitic fibers,and other carbon or mechanically robust materials,either alone or in *** other effective strategy is current collector substrate-assisted direct growth,including the use of carbon cloth,*** and other conductive ***,challenges and research opportunities are put forward at the end as the guidance for future development of binder-free PIB devices.

关键词： Binder-free Free-standing electrode Substrate-assisted directly grown electrode Potassium-ion battery Flexible device

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Electrolyte Concentration Regulation Boosting Zinc Storage Stability of High-Capacity K0.486V2O5 Cathode for Bendable Quasi-Solid-state Zinc Ion Batteries

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Nano-Micro Letters 2021年第2期13卷 232-245页

作者： Linpo Li Shuailei Liu Wencong Liu Deliang Ba Wenyi Liu Qiuyue Gui Yao Chen Zuoqi Hu Yuanyuan Li Jinping Liu School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Chemistry Chemical Engineering and Life Scienceand State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People’s Republic of China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025People’s Republic of China

Vanadium-based cathodes have attracted great interest in aqueous zinc ion batteries(AZIBs)due to their large capacities,good rate performance and facile synthesis in large ***,their practical application is greatly hampered by vanadium dissolution issue in conventional dilute ***,taking a new potassium vanadate K0.486V2O5(KVO)cathode with large interlayer spacing(~0.95 nm)and high capacity as an example,we propose that the cycle life of vanadates can be greatly upgraded in AZIBs by regulating the concentration of ZnCl2 electrolyte,but with no need to approach“water-in-salt”*** the optimized moderate concentration of 15 m ZnCl2 electrolyte,the KVO exhibits the best cycling stability with ~95.02% capacity retention after 1400 *** further design a novel sodium carboxymethyl cellulose(CMC)-moderate concentration ZnCl2 gel electrolyte with high ionic conductivity of 10.08 mS cm^-1 for the first time and assemble a quasi-solid-state *** device is bendable with remarkable energy density(268.2 Wh kg^−1),excellent stability(97.35% after 2800 cycles),low self-discharge rate,and good environmental(temperature,pressure)suitability,and is capable of powering small *** device also exhibits good electrochemical performance with high KVO mass loading(5 and 10 mg cm^-2).Our work sheds light on the feasibility of using moderately concentrated electrolyte to address the stability issue of aqueous soluble electrode materials.

关键词： Electrolyte concentration regulation Quasi-solid-state Zn ion battery K0.486V2O5 Large interlayer spacing Cycling stability

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