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SSRN 2023年

作者： Zhang, Zhi Ding, Xiang He, Xinyou Gong, Yang Xiao, Biaobiao Shen, Jixue Ou, Xing Hunan Provincial Key Laboratory of Water Treatment Functional Materials Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion Aircraf College of Chemistry and Materials Engineering Hunan University of Arts and Science Changde415000 China Engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and Environment Central South University Changsha410083 China Institute of Advanced Battery Materials and Devices Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd Liyang213300 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Developing high-voltage (≥4.3 V vs Li/Li+) single-crystal Ni-rich LiNixCoyMn1-x-yO2 offers an enticing strategy to achieve high energy density for lithium-ion batteries. However, at high-voltage operation, the cathode will be vulnerable to induce the intrinsic Oα- (α 0.6Co0.1Mn0.3O2 (SC-NCM) cathode materials by introducing the surface Se element, exhibiting an "anti-aging" effect of inhibiting the escape of oxygen on SC-NCM particles during the ultra-high voltage (4.7 V) cycling. Both theoretical calculation and experimental results confirm that the outside-in nanostructure would substitute some mobile Oα- at the surface of highly charged SC-NCM particle, stabilizing the oxygen lattice and suppressing O2 release during long-term cycling. Meanwhile, the surface modification of thin Se layer will alleviate the parasitic reactions and improve the electronic conductivity. Under the synergistic strategy of surface modification and interface doping, the obtained SC-NCM exhibits boosted cyclic stability in coin half-cell and pouch full-cell simultaneously. Therefore, the reversible capacity of LiNi0.6Co0.1Mn0.3O2 at high voltage is competitive with comercial LiNixCoyMn1-x-yO2 (x ≥ 0.8), demonstrating more superior safety ability and cyclic property. It provides an effective approach for improving the long-term performance of Ni-rich cathode materials for practical application under ultra-high working voltage. © 2023, The Authors. All rights reserved.

关键词： Single crystals

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Recent development of implantable and flexible nerve electrodes

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Smart materials in Medicine 2020年 1卷 131-147页

作者： Shi, Yue Liu, Ruping He, Liang Feng, Hongqing Li, Ye Li, Zhou Beijing Institute of Graphic Communication Beijing102600 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing100083 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Implantable electrical devices offer a variety of potential diagnostic options and treatments in different medical fields. Especially in the absence of specific drugs, the implantable nerve electrodes (INEs) are one of the main treatments for neurological diseases such as epilepsy, Parkinson's disease, Alzheimer's disease, etc. INEs are helpful in studying and regulating nervous system via recording nerve electrical signals or stimulating nerve tissue, but the mechanical mismatch between rigid electrode and soft biological tissue is a critical challenge for long-term implantation. The advances in micromachining technologies and materials have greatly promoted the development of INEs, such as enhanced biocompatibility, reduced foreign body reactions, and structural innovation. In particular, the mechanical performances of flexible implantable electrode and soft biological tissue matched better with less tissue damage. In this review, the implantable flexible nerve electrodes (IFNEs) based on functionalized substrates, intelligent electrodes, and innovative structures are elaborated and discussed. We summarized their various applications in neural prosthesis and neural signal recording. We also discussed the questions and possible methods for developing future IFNEs in the perspective. © 2020 The Authors

关键词： Electrodes

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Operando Selenium Treatment Towards Enhanced Cyclic Stability for Single-Crystal Ni-Rich Cathode at Ultra-High Voltage of 4.7 V

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SSRN 2023年

作者： Zhang, Zhi Ding, Xiang He, Xinyou Gong, Yang Xiao, Biaobiao Shen, Jixue Ou, Xing Engineering Research Center The Ministry of Education for Advanced Battery Materials School of Metallurgy and Environment Central South University Changsha410083 China Hunan Provincial Key Laboratory of Water Treatment Functional Materials Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion Aircraf College of Chemistry and Materials Engineering Hunan University of Arts and Science Changde415000 China Institute of Advanced Battery Materials and Devices Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd Liyang213300 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

关键词： Single crystals

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Entropy-Driven Structural Transition from Tetragonal to Cubic Phase: High Thermoelectric Performance of Cucdinse3 Compound

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SSRN 2023年

作者： Luo, Tingting Hu, Yihao Liu, Shi Xia, Fanjie Qiu, Junhao Peng, Haoyang Liu, Keke Guo, Quansheng Li, XingZhong Yang, Dongwang Su, Xianli Wu, Jinsong Tang, Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Key Laboratory for Quantum Materials of Zhejiang Province Department of Physics School of Science Westlake University Zhejiang Hangzhou310024 China School of Materials Science and Engineering Hubei University Hubei Wuhan430062 China Nebraska Center for Materials and Nanoscience University of Nebraska LincolnNE68588 United States

Cu based Chalcopyrite is an important class of thermoelectric materials with excellent electronic properties, however, the thermal conductivity is relatively high due to the simple tetragonal structure with highly ordered configuration on cation sites, limiting the thermoelectric performance. Herein, we realize that the modulation of entropy via alloying CdSe achieves the structural transition from tetragonal structure with ordered configuration on cations sites in CuInSe2 compound to cubic structured CuCdInSe3. CuCdInSe3 crystallizes in a zinc blende (ZnS) structure where Cu, Cd and In cations randomly occupy the Zn site with the occupancy rate of 1/3. This entropy driven order-disorder transition on the cation site, in conjunction with the intensified point defect phonon scattering via alloying CdSe in CuInSe2, dramatically suppress the thermal conductivity. An ultra-low thermal conductivity of 0.76 Wm-1K-1 at 780 K is achieved for CuCdInSe3 compound, which is only about 2/3 in comparison with that of CuInSe2 compound. CuCdInSe3 compound is an indirect semiconductor, where the minimum of conduction band (CBM) locates at Γ point and the maximum of valence band (VBM) locates at between Γ and A. The density of states in VBM of CuCdInSe3 compound are mainly contributed by the hybridization between Se-4p and Cu-3d orbitals, while that of CBM is dominant by Se-4p and In-5s orbitals. Minute adjustment of Cd content in CuCd(1+x)InSe3 compounds effectively modulates the carrier concentration and an optimized power factor of 0.58 Wm-1K-2 is attained at 578 K for CuCd1.01InSe3 compound, which is improved by 7.6 times in contrast with that of pristine CuCdInSe3 compound. The improved electronic properties integrating with the intrinsically low thermal conductivity result in an enhanced thermoelectric Figure of Merit ZT value of 0.45 at 780 K for CuCd1.005InSe3, which is six times higher than that of the pristine CuCdInSe3. © 2023, The Authors. All rights reserved.

关键词： Zinc sulfide

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TiN Paper for Ultrafast-Charging Supercapacitors

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Nano-Micro Letters 2020年第1期12卷 27-39页

作者： Bin Yao Mingyang Li Jing Zhang Lei Zhang Yu Song Wang Xiao Andrea Cruz Yexiang Tong Yat Li Department of Chemistry and Biochemistry University of CaliforniaSanta CruzSanta CruzCA 95064USA KLGHEI of Environment and Energy Chemistry MOE of the Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-Sen UniversityGuangzhou 510275People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ultrafast-charging energy storage devices are attractive for powering personal electronics and electric *** ultrafast-charging devices are made of carbonaceous materials such as chemically converted graphene and carbon ***,their relatively low electrical conductivity may restrict their performance at ultrahigh charging ***,we report the fabrication of a porous titanium nitride(TiN)paper as an alternative electrode material for ultrafast-charging *** TiN paper shows an excellent conductivity of 3.67×104 S m−1,which is considerably higher than most carbon-based *** paper-like structure also contains a combination of large pores between interconnected nanobelts and mesopores within the *** unique electrode enables fast charging by simultaneously providing efficient ion diffusion and electron *** supercapacitors(SCs)made of TiN paper enable charging/discharging at an ultrahigh scan rate of 100 V s−1 in a wide voltage window of 1.5 V in Na2SO4 neutral *** has an outstanding response time with a characteristic time constant of 4 ***,the TiN paper-based SCs also show zero capacitance loss after 200,000 cycles,which is much better than the stability performance reported for other metal nitride ***,the device shows great promise in *** filtration method enables good control of the thickness and mass loading of TiN electrodes and devices.

关键词： Ultrafast charging Wide voltage window TiN Paper-like electrode Supercapacitors

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Recovering Quadruple-cation Perovskite Films from Water Caused Permanent Degradations

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Journal of Wuhan University of technology(materials Science) 2020年第1期35卷 57-64页

作者：赵钦 ZHANG Boyu 彭勇黄志雄 WANG Song CHENG Yibing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Engineering Monash UniversityVIC3800Australia

To promote the stability and efficiency,quadruple-cation perovskite system(blending of MA,FA,Cs,I,Br,etc)was introduced to substitute the traditional MAPbI3 *** films degraded by water can be recovered by a simple *** PbI2 residues decomposed from perovskite were transformed into perovskite again,which gave rise to remarkably boosted optical properties,drastically improved film morphology and largely suppressed *** efficiency of the repairing method was testified by fieldemission scanning electron microscopy,atomic force microscopy,X-ray photoelectron spectroscopy,and so *** power conversion efficiency of fixed perovskite solar cells improved from around 3%to 15.78%(0.16 cm^2,mask area),and 12.56%at area of 1 cm^2,which prove that this method is very effective.

关键词： quadruple-cation perovskite solar cells repair

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Fast and stable Mg^2+ intercalation in a high voltage NaV2O2(PO4)2F/rGO cathode material for magnesium-ion batteries

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Science China materials 2020年第9期63卷 1651-1662页

作者： Junjun Wang Shuangshuang Tan Guobin Zhang Yalong Jiang Yameng Yin Fangyu Xiong Qidong Li Dan Huang Qinghua Zhang Lin Gu Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Sluggish kinetics of Mg^2+intercalation and low working potential seriously hinder the development of highenergy-density magnesium-ion batteries(MIBs).Hence developing cathode materials with fast Mg^2+diffusion and high working voltage is a key to overcome the obstacles in ***,a tetragonal NaV2O2(PO4)2 F/reduced graphene oxide(r GO)is proposed as an effective Mg^2+host for the first *** exhibits the highest average discharge voltage(3.3 V ***^2+/Mg),fast diffusion kinetics of Mg^2+with the average diffusivity of 2.99×10^-10 cm^2s^-1,and ultralong cycling stability(up to 9500 cycles).The Mg^2+storage mechanism of NaV2O2(PO4)2 F/r GO is demonstrated as a single-phase(de)intercalation reaction by in situ X-ray diffraction(XRD)*** functional theory(DFT)computations further reveal that Mg^2+ions tend to migrate along the a direction.X-ray absorption near edge structure(XANES)demonstrates a decrease in the average valence of vanadium,and the local coordination environment around vanadium site is highly conserved after ***,the assembled NaV2O2(PO4)2 F//Mg0.79NaTi2(PO4)3 Mg-ion full cell exhibits high power and energy densities,which indicates that NaV2O2(PO4)2 F/r GO owns potential for practical *** work achieves a breakthrough in the working voltage of cathode materials for MIBs and provides a new opportunity for high-energy-density MIBs.

关键词： high-voltage fast kinetics MIBs fluorophosphate full cell

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Numerical Investigation of Effect of Mechanical Compression on the Transport Properties of Fuel Cell Microporous Layer Using a Pore-Scale Model

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SSRN 2023年

作者： Zhang, Heng Hu, Hao Sarker, Mrittunjoy Shao, Xuanyu Zhan, Zhigang Sui, Pang-Chieh Chuang, Po-Ya Abel School of Low-Carbon Energy and Power Engineering China University of Mining and Technology Xuzhou221116 China Automobile Technology and Service College Wuhan City Polytechnic Wuhan430064 China Mechanical Engineering University of California Merced MercedCA95343 United States State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei430070 China Wuhan University of Technology China

The microporous layer (MPL) plays an important role in water and thermal management of proton exchange membrane fuel cells (PEMFCs). An in-depth investigation of the mechanical compression effect on transport properties in the MPL can help optimize cell performance and durability. In this work, the microstructure of the MPL is numerically reconstructed and the finite element method is applied to simulate mechanical behavior. In addition, the distribution of stress-strain, porosity, and pore size in the MPL under ten different levels of mechanical compression strains are studied. Lastly, the pore-scale model is employed to investigate the effective transport properties of the MPL as a function of compression strain. The analysis reveals that as the MPL strain increases from 0% to 40%, there is a 29% decrease in porosity, a 50% reduction in average pore diameter, a 60% decrease in effective gas diffusivity, a 100% increase in tortuosity, and an 80% increase in electrical and thermal conductivity. With the escalation of mechanical compression, both the magnitude and uniformity of stress-strain-displacement concurrently rise. This phenomenon is most prominently observed on the MPL surface. Mechanical compression strains below 20% exhibit a lesser impact on transport properties. Beyond this threshold, exceeding the 20% compression strain point, mechanical stress assumes a critical role in influencing MPL transport properties. This study offers a comprehensive overview of the impact of mechanical stress on the internal stress-strain relationship and transport properties of MPLs. The results provide valuable guidance for future MPL design and optimization of fuel cell performance. © 2023, The Authors. All rights reserved.

关键词： Pore size

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Interfacial Covalent Bonding Coupled Ultrafine Cus-Nanocrystals/Mxene Heterostructure for Efficient and Durable Magnesium Storage

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SSRN 2023年

作者： Cheng, Zhi Xu, Yanan Zhang, Xudong Peng, Qifan Wang, Kai Zhang, Xiong Sun, Xianzhong An, Qinyou Mai, Liqiang Ma, Yanwei Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei430070 China School of Engineering Sciences University of Chinese Academy of Sciences Beijing100049 China School of Materials Science and Engineering Zhengzhou University Henan Zhengzhou450001 China

Rechargeable magnesium batteries (RMBs) hold great potential for large-scale energy storage due to the dendrite-free deposition and high theoretical volumetric capacity of magnesium anode. However, the sluggish kinetics and poor reversibility of cathodes hinders their development in terms of high capacity and long cycling stability. Herein, a confined in-situ growth strategy is presented to construct novel copper sulfide (CuS)/delaminated Ti3C2Tx MXene (d-Ti3C2Tx) heterostructure, where ultrafine CuS nanocrystals are tightly anchored on the d-Ti3C2Tx substrate through S–Ti–C interfacial covalent bonding. This strong interaction not only enhances the conductivity of CuS, enabling rapid charge transfer, but also effectively buffers the volume expansion of CuS during the charge/discharge process. As a result, the CuS/d-Ti3C2Tx heterojunction exhibited high reversible specific capacity (336.5 mAh g−1) and outstanding rate capability. Remarkably, an impressive long-term cycling performance with a stable capacity of 92.2 mAh g−1 at 1000 mA g−1 was achieved over 1000 cycles. This study demonstrates the feasibility of integrating CuS with d-Ti3C2Tx MXene and provides an avenue for designing high-performance cathode materials for RMBs. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

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Numerical Investigation and Experimental Validation of Water Condensation in the Gas Diffusion Layer with Different Properties

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SSRN 2022年

作者： Zhang, Heng Sarker, Mrittunjoy Rahman, Md Azimur Zhan, Zhigang Sui, Pang-Chieh Chuang, Po-Ya Abel Mechanical Engineering University of California Merced MercedCA95343 United States Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China

Liquid water in the porous media hinders the transport of reactant to the catalyst layer, where the electrochemical reactions occur, which in turn, reduces performance and lifetime of a PEMFC. In this study, two different types of gas diffusion layer (GDL) materials are used to study the two-phase saturation distribution in a PEMFC. The correlations between the effective and anisotropic transport properties and porosity of the two GDLs are solved by the pore scale model. In addition, the anisotropic liquid water permeability and the relationship between saturation and capillary pressure is determined by using the Lattice-Boltzmann method. Fuel cell performance as well as liquid water distribution in the GDL using neutron radiography are obtained for validation. Under wet conditions, the cell with Freudenberg GDL performs better than that using Toray GDL, especially at high current densities. The results of the two-phase model simulation show that the peak water saturation for Toray GDL occurs in the catalyst layer and can reach 40%, while the peak water saturation for Freudenberg GDL occurs inside the GDL directly under the ribs and only reaches 25% saturation. The combined results provide key insights to enable high power operation of a PEMFC through GDL material optimization. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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