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Bismuth Oxide Selenium/Graphene Oxide composites:Toward High-Performance Electrodes for Aqueous Alkaline Battery

Energy & environmental Materials 2021年第3期4卷 465-473页

作者： Yi-Lin Liu Meng-Qiu Li Gui-Gen Wang Le-Yang Dang Fei Li Mei Er Pam Hua-Yu Zhang Jie-Cai Han Hui Ying Yang Shenzhen Key Laboratory for Advanced Materials Harbin Institute of TechnologyShenzhenShenzhen 518055China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore City 487372Singapore National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

Aqueous alkaline battery represents a promising energy storage technology with both high energy density and high power density as rechargeable ***,the low theoretical capacities,kinetics and stability of anode materials have limited their developments and *** this study,we propose a novel method to produce two-dimensional layered bismuth oxide selenium(Bi_(2)O_(2)Se)and reduced graphene oxide(r GO)composites via a one-step hydrothermal *** volume change caused by phase change during rapid charging and discharging is significantly reduced and the capacity reaches 263.83 m Ah g^(-1)at a current density of 0.5 A g^(-1).The Bi_(2)O_(2)Se/r GO electrode exhibits excellent cycling stability in which the capacity retention rate is 81.04%after 5000 *** importantly,the Bi_(2)O_(2)Se/r GO nanosheet composite is used as the anode electrode material with MnCo_(2)O_(4.5)@Ni(OH)_(2)as the cathode electrode material in aqueous alkaline *** the energy density is 76.16 W h kg^(-1),the power density reaches 308.65 W kg^(-1).At a power density of 10.21 k W kg^(-1),the energy density remains as high as 33.86 W h kg^(-1).The results presented here may advance the understanding of the issues facing the development of aqueous battery anode materials.

关键词： anode materials aqueous alkaline battery Bi_(2)O_(2)Se nanosheet reduced graphene oxide

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Design strategy of a high-performance multispectral stealth material based on the 3D meta-atom

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Photonics Research 2023年第11期11卷 1934-1944页

作者： PINGPING MIN ZICHENG SONG TIANYU WANG VICTOR GRALCHENKO YURONG HE JIAQI ZHU National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150080China Prokhorov General Physics Institute of Russian Academy of Sciences Moscow 119991Russia

In this paper,a 3D meta-atom-based structure is constructed for the multifunctional compatible design of visible,infrared,and *** achieve high performance,a novel dispersion tailoring strategy is *** the incorporation of multiple controllable losses within the 3D meta-atom,the dispersion characteristics are tailored to the desired target *** effectiveness of the strategy is verified with an error rate of less than5%.A proof-of-concept prototype is designed and fabricated,exhibiting high visible transparency,low infrared emission of 0.28,and microwave ultra-broadband absorption with a fractional bandwidth of 150%under 2.7 to18.7 *** work contributes a novel design strategy for the development of high-performance multispectral stealth materials with wide applications.

关键词： performance visible microwave

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A Single-Layer Piezoelectric Composite Separator for Durable Operation of Li Metal Anode at High Rates

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Energy & environmental Materials 2024年第1期7卷 265-274页

作者： Yuanpeng Ji Botao Yuan Jiawei Zhang Zhezhi Liu Shijie Zhong Jipeng Liu Yuanpeng Liu Mengqiu Yang Changguo Wang Chunhui Yang Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150080China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Piezoelectric ceramic and polymeric separators have been proposed to effectively regulate Li deposition and suppress dendrite growth,but such separators still fail to satisfactorily support durable operation of lithium metal batteries owing to the fragile ceramic layer or low-piezoelectricity polymer as ***,by combining PVDF-HFP and ferroelectric BaTiO_(3),we develop a homogeneous,single-layer composite separator with strong piezoelectric effects to inhibit dendrite growth while maintaining high mechanical *** squeezed by local protrusion,the polarized PVDF-HFP/BaTiO_(3)composite separator generates a local voltage to suppress the local-intensified electric field and further deconcentrate regional lithium-ion flux to retard lithium deposition on the protrusion,hence enabling a smoother and more compact lithium deposition morphology than the unpoled composite separator and the pure PVDF-HFP separator,especially at high ***,the homogeneous incorporation of BaTiO_(3)highly improves the piezoelectric performances of the separator with residual polarization of 0.086 pC cm^(-2)after polarization treatment,four times that of the pure PVDF-HFP separator,and simultaneously increases the transference number of lithium-ion from 0.45 to *** from the prominent piezoelectric mechanism,the polarized PVDF-HFP/BaTiO_(3)composite separator enables stable cyclic performances of Li||LiFePO_(4)cells for 400 cycles at 2 C(1 C=170 mA g^(-1))with a capacity retention above 99%,and for 600 cycles at 5 C with a capacity retention over 85%.

关键词： composite separator Li metal anodes piezoelectric materials PVDF-HFP uniform Li deposition

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In-Situ Assembly of Polypyrrole Onto Heterocyclic Aramid for High-Strength, Ultratough, Durable, and Multifunctional Films

SSRN

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SSRN 2024年

作者： Xiong, Jinhua Zhao, Xu Li, Pengyang Lian, Huanxin Yan, Qian Chen, He Liu, Zonglin Chen, Zhong Peng, Qingyu He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

High-strength, ultratough, multifunctional polymer-based electromagnetic interference (EMI) shielding nanocomposite films have colossal application potential in artificial intelligence, 5G communications, and flexible electronics. In this work, a large-scale, high-strength, and ultratough heterocyclic aramid@polypyrrole (HA@PPy) composite film is developed via the in-situ loading of PPy onto the HA template. The synthesized films achieve remarkable mechanical properties and high electronic conductivity by using the template effect of HA to guide the assembly of conductive polymers. When the content of PPy is 45 wt.%, the HA@PPy (HP45) film possesses excellent tensile strength (240.3 MPa), significant elongation at break (25.9%), outstanding toughness (53.1 MJ m-3), and exceptional folding durability owing to strong hydrogen bond interaction between PPy and HA. Furthermore, thanks to the highly connected conductive paths formed by PPy, the HP45 film exhibits satisfactory EMI shielding effectiveness (EMI SE) of 45.5 dB and specific EMI SE of 14691.6 dB cm2 g-1 at an ultra-thin thickness (26.3 μm). The HP45 film also demonstrates excellent electromagnetic protection, electro-/photothermal deicing, thermal therapy, and flame retardancy applications. Therefore, high-performance and multifunctional HA@PPy films have substantial potential for widespread application in EMI shielding and thermal management. © 2024, The Authors. All rights reserved.

关键词： Nanocomposite films

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Strain‑Induced Surface Interface Dual Polarization Constructs PML‑Cu/Bi_(12)O_(17)Br_(2) High‑Density Active Sites for CO_(2) Photoreduction

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Nano-Micro Letters 2024年第5期16卷 169-183页

作者： Yi Zhang Fangyu Guo Jun Di Keke Wang Molly Meng‑Jung Li Jiayu Dai Yuanbin She Jiexiang Xia Huaming Li School of Chemistry and Chemical Engineering Institute for Energy ResearchSchool of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013People’s Republic of China State Key Laboratory Breeding Base of Green Chemistry‑Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014People’s Republic of China College of Science and Hunan Key Laboratory of Extreme Matter and ApplicationsNational University of Defense TechnologyChangsha 410073People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongPeople’s Republic of China School of Chemistry and Chemical Engineering National Special Superfine Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094People’s Republic of China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal UniversityJinhua 321004People’s Republic of China

The insufficient active sites and slow interfacial charge trans-fer of photocatalysts restrict the efficiency of CO_(2) *** synchronized modulation of the above key issues is demanding and ***,strain-induced strategy is developed to construct the Bi–O-bonded interface in Cu porphyrin-based monoatomic layer(PML-Cu)and Bi_(12)O_(17)Br_(2)(BOB),which triggers the surface interface dual polarization of PML-Cu/BOB(PBOB).In this multi-step polarization,the built-in electric field formed between the interfaces induces the electron transfer from con-duction band(CB)of BOB to CB of PML-Cu and suppresses its reverse ***,the surface polarization of PML-Cu further promotes the electron converge in Cu *** introduction of PML-Cu endows a high density of dispersed Cu active sites on the surface of PBOB,significantly promoting the adsorption and activation of CO_(2) and CO *** conversion rate of CO_(2) photoreduction to CO for PBOB can reach 584.3μmol g-1,which is 7.83 times higher than BOB and 20.01 times than *** work offers valuable insights into multi-step polarization regulation and active site design for catalysts.

关键词： Bi_(12)O_(17)Br_(2) Porphyrin CO_(2)photoreduction Polarization Active sites

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Double-Layered Carbon Fiber Stitched Fabric Reinforced Ceramic / Polymer Integrated Gradient composites for Ablation Resistance, Thermal Insulation and Load-Bearing Performance

SSRN

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SSRN 2023年

作者： Xia, Chunlei Xie, Weihua Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

This paper reports a double-layered carbon fiber fabric reinforced SiBCN ceramic polymer gradient composite material. The upper layer is ceramic layer, the lower layer is resin layer, with densities of 1.69 g/cm3 and 1.05 g/cm3, respectively, with a gradient transition between the two layers. After ablation mechanism and properties were studied by oxyacetylene ablation test with heat flux of 1.8 MW/m2, 2.5 MW/m2, and 3.8 MW/m2, the ablated samples had no noticeable ablation cracks and pits. The material has good ablation resistance, heat insulation and compressive properties. It exhibits new ideas for the design of multifunctional integrated gradient composite materials. © 2023, The Authors. All rights reserved.

关键词： Reinforcement

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X-ray stress measurement of SiC single-crystal induced by laser ablation 8

X-ray stress measurement of SiC single-crystal induced by la...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Deng, Ya Zhou, Yufeng Zhang, Yumin National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

The residual stress distribution induced by nanosecond UV laser irradiation on the surface of SiC single crystal was detected through X-ray stress measurement method in this manuscript. In order to explain the generation mechanism of the residual stresses, the surface morphology of the laser ablation zone was characterized by laser scanning confocal microscopy. Besides, the material compositions of the ablation zone were also observed by using energy dispersive X-ray spectrometer. The measurement results indicated that tensile stress distribution existed around the laser-irradiated zone, while the center position of the laser spot had the smaller residual stresses. There were obvious bulges at the ablation zone margin, which may be caused by the melting of the material and the splashing and re-solidification of molten material in the ablation hole. In addition, there exists oxidation phenomenon in the irradiated region by comparing the EDS results of laser irradiated and unirradiated regions. This suggested that the temperature reached its melting point and photothermal ablation occurred when laser irradiated on the surface of the silicon carbide specimen. Therefore, it can be concluded that the existence of residual stresses was related to the local thermal expansion caused by laser irradiation. And the residual stresses at the marginal zone had the larger tensile stresses because of the transverse extrusion effect. © 2022 SPIE

关键词： Silicon carbide

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On the Origin of Sanchez-Lacombe Equation of State Theory in Hydrostatic Strain Energy Model for Rubber-Like Materials

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SSRN 2023年

作者： Liu, Chang Lu, Haibao National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

To describe the volume deformation of rubber-like materials, the strain energy density (SED) function of a compressible hyperelastic model is typically formulated as the hydrostatic/liquid-like term from interchain interaction changes plus the compressible elastic term owing to elastic deformation of network chains;while the former is widely believed to dominate volume responses. Although the physics of the hydrostatic term is clear, there are few physically-based models available for it. In our previous work (Liu and Lu, 2023), we constructed a physically-based hydrostatic SED function inspired by the Flory-Orwoll-Vrij equation of state (EOS) theory for pure polymer fluids, and proposed the general strategy for developing hydrostatic functions according to the EOS theories. The present work is inspired by the Sanchez-LacombeEOS theory (note: a type oflattice-fluid EOS theory);and we assume: (i) a rubber-like material consists of polymer segments occupying lattice sites and unoccupied/vacant lattice sites, and the compressibility of the material corresponds to changes in vacant sites fraction;(ii) the hydrostatic strain energy is associated with the interchain interaction energy change and the mixing entropy change between network and vacant *** to the Helmholtz free energy in Sanchez-Lacombe EOS theory and limiting our attention to the isothermal condition, another physically-based hydrostatic SED function is constructed;a specific compressible hyperelastic model is provided by further combining compressible 8-chain elastic SED function. And the basic framework of this compressible model is inherently consistent with the Flory-Rehner framework for swollen elastomers. Our model provides good predictions for volume deformation data of ten different rubber-like materials in hydrostatic compression (HC), uniaxial tension (UT), and constrained uniaxial compression (CUC). And the model reveals that HC, CUC, or uniaxial compression correspond to the entropy-de

关键词： Strain energy

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A Comprehensive Study of Pyrolysis Characteristics of Silicone-Modified Phenolic Aerogel Matrix Nanocomposites: Kinetic Analysis, Reaxff Md Simulations, and Ann Prediction

SSRN

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SSRN 2023年

作者： Xiao, Jie Fang, Guodong Jin, Xiangyu Wang, Bing Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

The pyrolysis characteristics of the polymeric nanocomposites are dominantly regulated by the pyrolyzable components to accommodate a specific thermodynamic environment. In our work, the pyrolysis behavior of the pyrolyzable system including silicone and phenolic aerogels (SiOC/PR) of silicone-modified phenolic aerogel matrix nanocomposites is carried out by TG, TG-FTIR, and Py-GC/MS. The experimental results show that the SiOC/PR systems have three major decomposition stages and exhibit better thermal stability when the mass ratio of SiOC to PR is 1:3. Then the distributed activation energy model (DAEM) with logistic distribution is employed to study the multi-stage decomposition kinetics of SiOC/PR systems, where the five pseudo-components DAEM effectively represents the decomposition conversion signature. The significant pyrolysis products detected by TG-FTIR are examined by ReaxFF molecular dynamics (MD) simulations. MD results reveal that methanol is the primary volatile product affecting SiOC/PR systems in a high-temperature oxygen-free environment. Two reaction mechanisms for methanol are identified by the MD trajectory, which are the extraction reactions of methyl intermediates as well as hydroxymethyl intermediates, respectively. Then the kinetic factors are calculated by specific reaction mechanisms. Finally, using an artificial neural network with the TG data and MD results as inputs, the mixture ratio of the pyrolyzable system of the SiOC/PR nanocomposites with better thermal insulation equaling 0.22 is predicted. This work can help understand the system’s chemical features and guide the pyrolyzable system design of the SiOC/PR nanocomposites. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Polybenzimidazole functionalized electrolyte with Li-wetting and self-fluorination functionalities for practical Li metal batteries

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InfoMat 2022年第5期4卷 174-186页

作者： Dongjiang Chen Yuanpeng Liu Chuan Xia Yupei Han Qingwei Sun Xuchang Wang Wei Chen Xian Jian Weiqiang Lv Jianyi Ma Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbinChina School of Physics University of Electronic Science and Technology of ChinaChengduChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengduChina Institute of Atomic and Molecular Physics Sichuan UniversityChengduSichuanChina

Rough Li plating,low ionic conductivity,and low thermal stability of conventional electrolytes post-primary challenges for achieving reliable high-capacity rechargeable lithium batteries,for which lithiummetal is frequently proposed as themost promising anode *** low-polarity commercial polypropylene/polyethylene separators fail to support the application of high-energy-density Li anodes due to their rigid physicochemical properties and the high reactivity of Li metal,leading to fatal dendrite formation and vigorous exothermic reaction with ***,we develop a Li-wetting,flame-retardant binary polymer electrolyte by functionalizing poly(vinylidene fluoride)(PVDF)separators with nonflammable polybenzimidazole(PBI)to build safe room-temperature solid-state electrolyte membranes.A dendrite-free LiFePO4 cell with the solid polymer electrolyte(SPE)delivers a discharge capacity of 127 mAh g^(-1) at 25℃ with a capacity retention of 87.5%after 500 cycles at 0.5℃(0.15 mA cm^(-2)).Phase-field simulations and density functional theory calculations demonstrate that the negatively charged benzimidazole chains of PBI own superior affinity to lithium bis(trifluoromethanesulfonyl)imide(LiTFSI),and shares overlapping electron density with Li anode,giving rise to accelerated Li^(+)conduction at room temperature and uniform Li electrodeposition at the electrolyte/Li metal *** SPE is also flame-retardant since heat-resistant polytetrafluoroethylene and a dense,heat-blocking graphitized carbon layer are formed in intense heat throughdehydrogenation/fluorination of PVDF under the catalysis of Lewis base imidazole rings and the decomposition of benzimidazole rings in *** such fire-resistant mechanism is ever reported in conventional electrolytes.

关键词： flame-retardant properties Li metal polybenzimidazole solid polymer electrolyte uniform Li deposition

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