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SSRN 2023年

作者： Sun, Shuokun Xia, Xiaoyan Gao, Mingrui Wei, Wei Cui, Shichuang Zhu, Quanyao School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Hubei Wuhan430070 China Department of Physics Changji University Xinjiang Changji831100 China

Electrochromic materials have attracted intensive attention due to friendly relationship to the environment, energy and user experience. Layered vanad-based compounds are considered as one kind of the most promising electrochromic materials. However, they are plagued by the appearance of ion channel collapse, capacity loss, and aqueous electrochromic materials exhibit poor cycling stability. Herein, we report on KV3O8·0.75H2O (KVO) and further complexed it into a network formed by linear methylcellulose, realizes a stand-alone cellulose composite KVO electrochromic film. K doping destroys the preferred orientation of V2O5 (002) crystal plane and expands the interplanar spacing to 6.9 Å. Cellulose significantly increases the viscosity of the sol (6 times) and acts as a "strengthener". Firstly, the electrochromic properties of methylcellulose composite KVO film (KVO/MC) were studied in 1 mol L-1 LiClO4 nonaqueous electrolyte. The film can freely switch between green-yellow and orange-red, and can retain more than 67% of the charge capacity after 2000 cycles. We further introduce flexible electrochromic devices assembled from KVO/MC films. Development of a self-healing LOC-based gel electrolyte composed of Ethene, 1-chloro-1,2,2-trifluoro-, polymer with 1,1- difluoroethene (P(CTFE-VDF)) and Li+ electrolyte, which is highly consistent with the device. It has a high colouring efficiency of 78.8 cm2 C -1 , achieving fast response (≤5.6 s) and long service life (>77% of the charge capacity and 70% of the optical contrast after 10000 cycles). This design shows great application potential in manufacturing large-area (20×30 cm2 ) flexible devices. © 2023, The Authors. All rights reserved.

关键词： Electrochromism

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Approaching strain limit of two-dimensional MoS_(2) via chalcogenide substitution

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Science Bulletin 2022年第1期67卷 45-53,M0004页

作者： Kailang Liu Xiang Chen Penglai Gong Ruohan Yu Jinsong Wu Liang Li Wei Han Sanjun Yang Chendong Zhang Jinghao Deng Aoju Li Qingfu Zhang Fuwei Zhuge Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Department of Physics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China Institutes of Physical Science and Information Technology Anhui UniversityHefei 231699China School of Physics and Technology Wuhan UniversityWuhan 430072China

Strain engineering is a promising method for tuning the electronic properties of two-dimensional(2 D)materials,which are capable of sustaining enormous strain thanks to their atomic ***,applying a large and homogeneous strain on these 2D materials,including the typical semiconductor MoS_(2),remains *** we report a facile strategy for the fabrication of highly strained MoS_(2) via chalcogenide substitution reaction(CSR)of MoTe_(2) with lattice *** MoS_(2)resulting from the sulfurized MoTe_(2) sustains ultra large in-plane strain(approaching its strength limit~10%)with great ***,the strain can be deterministically and continuously tuned to~1.5%by simply varying the processing *** to the fine control of our CSR process,we demonstrate a heterostructure of strained MoS_(2)/MoTe_(2)with abrupt ***,we verify that such a large strain potentially allows the modulation of MoS_(2) bandgap over an ultra-broad range(~1 e V).Our controllable CSR strategy paves the way for the fabrication of highly strained 2D materials for applications in devices.

关键词： Strain engineering 2D materials Chalcogenide substitution Controllable strain Lattice inheritance

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CdS nanosheets decorated with Ni@graphene core-shell cocatalyst for superior photocatalytic H_(2) production

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Journal of Materials Science & technology 2020年第21期56卷 170-178页

作者： Tingmin Di Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

A novel cocatalyst,*** nickel nanoparticles encapsulated in few-layer graphene(Ni@C),is obtained by carbonization of metal–organic frameworks(MOF)and leaching treatment of hydrochloric *** is selected as the cocatalyst for CdS nanosheets,forming CdS-Ni@C *** remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene *** addition,the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient,which avoids contamination and curbs *** larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C,suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole *** strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.

关键词： CdS nanosheets Photocatalytic hydrogen production Nickel Graphene Core-shell cocatalyst Metal-organic frameworks(MOF)

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3D nonlinear photolithography of tin oxide ceramics via femtosecond laser

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Science China Materials 2021年第6期64卷 1477-1484页

作者： Nianyao Chai Yanan Liu Yunfan Yue Ping Wei Xuewen Wang Junjie Zhao Qi Zhang Fuzhi Huang Zhongle Zeng Zongsong Gan Liqiang Mai Yibing Cheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryFoshan 528216China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

As a wide band gap semiconductor material,tin oxide(SnO_(2))has been widely used in gas sensing,optoelectronics and *** complex micro and nanoscale threedimensional(3D)geometric structures endow the conventional SnO_(2)ceramics with novel properties and ***,ceramics cannot be cast or machined easily due to their high mechanical toughness and *** additive manufacturing opens a great opportunity for flexibly geometrical shaping,while the arbitrary shaping of SnO_(2)ceramics at micro and nanoscale is always a ***,preceramic monomers which can be polymerized under ultrafast laser irradiation,were utilized to form complex and arbitrary 3D preceramic polymer *** calcination treatment,these green-body structures could be converted into pure high-dense SnO_(2)ceramics with uniform shrinkage,and the feature size was down to *** electron microscopy(TEM)analysis displays that the printed SnO_(2)ceramic nanostructures can be nanocrystallized with grain sizes of 2.5±0.4 *** work provides the possibility of manufacturing 3D SnO_(2)ceramic nanostructures arbitrarily with sub-100 nm resolution,thus making it promising for the applications of SnO_(2)in different fields.

关键词： tin oxide ceramics nonlinear photolithography femtosecond laser

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Achieving Enhanced Strength Retention in Ultrafine-Fibrous Interconnected Al-Based Ternary Eutectic Alloy at Elevated Temperatures

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SSRN 2023年

作者： Gan, Zhanghua Li, Yingyu Zhang, Penghui Wu, Chuandong Shen, Shuai Huang, Yuanyuan Zhong, Songqiang Yang, Tian Luo, Guoqiang Liu, Jing State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Hubei Wuhan430081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China College of Materials Science and Engineering Shenzhen University Shenzhen518000 China

Certain two-phase regions with coarse structure could be usually detected concurrently along with three-phase eutectics in ternary eutectic alloy, leading to the formation of heterogeneous structure with limited ductility. In this study, Al-Ce-Ni eutectic alloy was chosen as modal system, which was firstly reported to be solidified under super-gravity field with high volume fraction of three-phase eutectics. Meanwhile, the formation of ultrafine-fibrous interconnected Al11Ce3-Al3Ni eutectic clusters with more "chains" and higher spatial connectivity was detected mainly due to the relatively higher nucleation rate. The high volume fraction and refinement of interconnected Al11Ce3-Al3Ni eutectic clusters with excellent thermal stability could contribute to enhancement of ductility and tensile strength at elevated-temperature. Interestingly, the strength retention at 300 oC and 400 oC were able to reach up to ~68.1 % and ~33.2 %, respectively. © 2023, The Authors. All rights reserved.

关键词： Solidification

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H2O molecule adsorption on s-triazine-based g-C3N4

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Chinese Journal of Catalysis 2021年第1期42卷 115-122页

作者： Bicheng Zhu Liuyang Zhang Bei Cheng Yan Yu Jiaguo Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Key Laboratory of Eco-materials Advanced Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350116FujianChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

The interaction between a gas molecule and photocatalyst is vital to trigger photocatalytic *** surface state of photocatalyst affects much in this ***,adsorption of H2O molecules on s-triazine-based g-C3N4 was thoroughly studied by first-principle *** various initial adsorption models with multifarious locations of H2O molecules were built,the optimized models with strong adsorption energy pointed to the same adsorption configuration,in which the H2O molecule hold an upright orientation above the corrugated g-C3N4 *** intermolecular O-H…N hydrogen bond formed via the binding of a polar O-H bond in H2O molecule and a two-coordinated electron-rich nitrogen atom in *** the bridging effect of this intermolecular hydrogen bond,electrons would transfer from g-C3N4 to the H2O molecule,thereby lowering the Fermi level and enlarging work function of ***,regardless of the substitute,i.e.g-C3N4 multilayer,large supercell and nanotube,this adsorption system was highly reproducible,as its geometry structure and electronic property remained *** addition,the effect of nonmetal element doping on adsorption energy was *** work not only disclosed a highly preferential H2O adsorbed g-C3N4 architecture established by intermolecular hydrogen bond,but also contributed to the deep understanding and optimized design in water-splitting process on g-C3N4-based photocatalysts.

关键词： g-C3N4 H2O Density functional theory Hydrogen bond Adsorption energy

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Electron transfer kinetics in CdS/Pt heterojunction photocatalyst during water splitting

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Chinese Journal of Catalysis 2022年第10期43卷 2530-2538页

作者： Jianjun Zhang Gaoyuan Yang Bowen He Bei Cheng Youji Li Guijie Liang Linxi Wang Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina College of chemistry and Chemical engineering Jishou UniversityJishou 416000HunanChina

Noble metal cocatalysts have shown great potential in boosting the performance of CdS in photocatalytic water ***,the mechanism and kinetics of electron transfer in noble-metal-decorated CdS during practical hydrogen evolution is not clearly ***,Pt-nanoparticle-decorated CdS nanorods(CdS/Pt)are utilized as the model system to analyze the electron transfer kinetics in CdS/Pt *** femtosecond transient absorption spectroscopy,three dominating exciton quenching pathways are observed and assigned to the trapping of photogenerated electrons at shallow states,recombination of free electrons and trapped holes,and radiative recombination of locally photogenerated electron-hole *** introduction of Pt cocatalyst can release the electrons trapped at the shallow states and construct an ultrafast electron transfer tunnel at the CdS/Pt *** CdS/Pt is dispersed in acetonitrile,the lifetime and rate for interfacial electron transfer are respectively calculated to be~5.5 ps and~3.5×10^(10) s^(−1).The CdS/Pt is again dispersed in water to simulate photocatalytic water *** lifetime of the interfacial electron transfer decreases to~5.1 ps and the electron transfer rate increases to~4.9×10^(10) s^(−1),confirming that Pt nanoparticles serve as the main active sites of hydrogen *** work reveals the role of Pt cocatalysts in enhancing the photocatalytic performance of CdS from the perspective of electron transfer kinetics.

关键词： Femtosecond transient absorption spectroscopy Photocatalytic water splitting CdS Electron transfer kinetics Trap state

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Bromine-Defect Induced High Sensitivity of Cs4PbBr6 Nanocrystals Humidity Sensor

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SSRN 2024年

作者： Liu, Yueli Guo, Hongbing Mei, Aohan Chen, Keqiang Chen, Wen State Key Laboratory of Silicate Materials for Architectures School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park Wuhan University of Technology Sanya572024 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China

Recently, all-inorganic halide perovskite materials have attracted much attention in the fields of humidity sensor due to their sensitive surface, tunable bandgap, high conductivity and excellent carrier mobility. However, their inherent instability and limited sensitivity restrict further application in electronic devices. Herein, we demonstrate a high-performance impedimetric humidity sensor based on an all-inorganic halide perovskite Cs4PbBr6 nanocrystals (NCs), which are obtained by anti-solvent method without long chain ligands. It is found that Br vacancy defects act as the active site to enhance the ability of adsorbing water molecules. The humidity sensor of Cs4PbBr6 NCs achieves high response value over 4 orders of magnitude at 11-98% relative humidity, short response/recovery time (8 s/6 s), favorable repeatability, excellent selectivity and good long-term stability. Moreover, high humidity sensing performance enables the humidity sensor of Cs4PbBr6 NCs to possess great potentials in breath monitor and noncontact switch application. © 2024, The Authors. All rights reserved.

关键词： Bromine compounds

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Soluble Ultra-High Molecular Weight Poly(4,4′-Diphenylether-5,5′-Bibenzimidazole) Based Membranes with Remarkable Mechanical Strength and Specific Proton Conductivity for High Temperature Proton Exchange Membrane Fuel Cells

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SSRN 2023年

作者： Liu, Guoliang Wang, Ailian Ji, Wenxi Zhang, Longgui Wu, Jianing Zhang, Taoyi Tang, Haolin Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Nr. 122 Luoshi Rd. Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China Research Institute of Chemical Industry Co. Ltd Beijing100013 China Hubei Key Laboratory of Fuel Cell Technology Wuhan University of Technology Wuhan430070 China

Reducing the thickness of membrane electrolyte is one important direction to improve Ohmic polarization and the according performance of high-temperature proton exchange membrane fuel cells for its widespread applications. Herein, we report that robust thin membranes can be formed using a soluble ether-contained poly(4,4′-diphenylether-5,5′-bibenzimidazole) with an ultra-high molecular weight of 170 kDa. Due to the enhanced chain entanglement of high molecular weight polymers, the formed thin membrane exhibits promising mechanical strength, thermal and oxidation stability. The optimized membrane with thickness of 61 µm and phosphoric acid uptake of 606 wt.% has the high specific proton conductivity of 25.9 S cm-2 at 160 oC under anhydrous conditions and mechanical strength of 11.2 MPa. The accordingly fabricated membrane electrode assembly delivers a peak power density of 0.544 W cm-2 with the open circuit voltage of 0.915 V at 160 oC using air as oxidant, outperforming the value of 0.522 W cm-2 for the commercial membrane electrode assembly with thickness of 250 µm and phosphoric acid uptake of 1018 wt.%. © 2023, The Authors. All rights reserved.

关键词： Proton conductivity

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Low Temperature Method-Based Evaporation/Spray-Coating technology for Wide Bandgap Perovskite Solar Cells

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SSRN 2024年

作者： Liang, Cheng Du, Hong-Qiang Geng, Cong Yu, Xinxin Jiang, Xiongzhuang Huang, Shangwei Long, Fei Han, Liyuan Li, Wangnan Liang, Guijie Li, Bin Cheng, Yi-Bing Peng, Yong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 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 Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China

Years of working on perovskite solar cells (PSCs) based tandem devices and single-junction devices have approved that low annealing temperature can be beneficial of improving devices performances. In this paper, a pseudo-halogen ion engineering works well in the evaporation/spray-coating method. According to our research, it is proved that the addition of formamidine acetate (FAAc) can effectively reduce annealing temperature from 170 ℃ to 150 ℃, accelerate the maturation process of the perovskite films, and broaden the annealing window. As a result, a perovskite film with homogeneous crystallization and low residual stress is achieved, leading to extended charge carrier lifetimes, elevated photoluminescence quantum yields (PLQY), reduced Urbach energies. The corresponding PSCs prepared through evaporation/spray-coating method achieve an impressive power conversion efficiency (PCE) of 19.46%, which is the highest efficiency among wide-bandgap (WBG) PSCs fabricated by this method. And the unencapsulated devices exhibit satisfactory stability, retaining 80% of the initial PCE after 600 h of thermal aging at 60 ℃ and retaining 90% of the initial PCE after 1500 h of 50% humidity aging at 25 °C, respectively. © 2024, The Authors. All rights reserved.

关键词： Evaporation

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