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Ultralight Ppy@Pva/Bc/Mxene Composite Aerogels for High-Performance Supercapacitor Electrodes and Pressure Sensors

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SSRN 2023年

作者： Zheng, Wenfeng Yang, Yuan Fan, Lingling Ye, Dezhan Xu, Weilin Xu, Jie State Key Lab for Hubei New Textile Materials and Advanced Processing Technology College of Materials Science & Engineering College of Textile Science & Engineering Wuhan Textile University Wuhan430200 China

Directional freezing is an efficient approach to design anisotropic materials with surface void and well-defined aligned channels along the freezing direction for charge transmission and ion diffusion. Herein, poly(vinyl alcohol) (PVA)/bacterial cellulose (BC)/MXene (PBM) composite aerogels are prepared via directional freezing. The aligned porous architecture of PBM not only enables uniform loading and high accessibility of PPy through the aerogel network, but also ensures efficient penetration and fast transport of electrolytes. The as-prepared PPy@PVA/BC/MXene (PPy@PBM) aerogel electrodes show a high areal specific capacitance of 3948 mF cm-2 at 0.47 mA cm-2, a desirable energy density 178 μWh cm-2 at a power density of 951 μW cm-2 and excellent cycling stability (105% capacitance retention after 5000 cycles). In addition, the PPy@PBM aerogels demonstrate high sensitivity (313.2 kPa-1 in 200 to 3000 Pa pressure range), ultralow detection limit ( © 2023, The Authors. All rights reserved.

关键词： Aerogels

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

Al-Doped Nb2o5/Carbon Micro-Particles Anodes for High Rate Lithium-Ion Batteries

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SSRN 2022年

作者： Zhu, Zhu Liu, Fang Wang, Hong Yu, Ruohan Wu, Jinsong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China Wuhan University of Technology Wuhan430070 China

Orthorhombic niobium pentoxide (T-Nb2O5 ) has attracted extensive attention in the field of ultra-fast lithium ion batteries (LIBs) due to its high rate performance. However, its instability at a low potential and inherent low conductivity limits its fast charging capability. Here, microspheres of aluminum-doped T-Nb2O5 embedded in N-doped carbon network (Al-Nb2O5@NC) are prepared. The effects of Al-doping on the crystal structure and electrochemical properties are systematically studied. It is found that Al-doping has led to increase of the density of O2- vacancies and then low-oxidized state Nb4+ ions, improving ionic and electrical conductivity. The substitution of Al3+ ions for Nb5+ ions improves the lattice stability, reduces the undesirable migration of Nb in cycling, and stabilizes the capacity during fast charging. The LIBs using Al-Nb2O5@NC as anode have high rate performance and cycling stability ( i.e. , ~82 mAh g-1 at 20 A g-1 after 9900 cycles). Meanwhile, the intercalation-type electrochemical reaction is verified by in-situ transmission electron microscope (TEM), by which it is found that Al-Nb2O5@NC has better crystalline integrity. By integrating Al doping and carbon network, the micron-size Al-Nb2O5@NC particles developed in this work are promising anodes to build fast charge/discharge LIBs with high specific capacity, stability and excellent rate performance. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries

A Highly Efficient High-Entropy Metal Hydroxymethylate Electrocatalyst for Oxygen Evolution Reaction

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SSRN 2022年

作者： Jiang, Qi Gu, Junfeng Zhang, Long Liu, Kailong Huang, Mengyan Liu, Peng Zuo, Shiyu Wang, Yilong Ma, Peiyan Fu, Zhengyi College of Chemistry Wuhan University of Technology Wuhan430000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430000 China

Much attention has been paid to high entropy materials in the field of electrochemical water splitting. In this research, we present a synthesis of a high-entropy metal hydroxymethylate FeCoNiMgCr(OH)(OCH 3 ) (labeled as FeCoNiMgCr-HM) material via a one-step solvothermal method. Due to the synergistic effect of five metal cations and complete surface reconstruction induced by methoxyl group, FeCoNiMgCr-HM after electrochemical activation exhibits an outstanding performance for catalyzing lattice-oxygen-participated OER with a low overpotential of 291 mV to reach a current density of 20 mA cm -2 and a small Tafel slope of 49.1 mV dec -1 . In addition, we summarize a universal ionic potential rule for guiding the synthesis of metal hydroxymethylate materials. © 2022, The Authors. All rights reserved.

关键词： Entropy

Berlin Green Framework‑Based Gas Sensor for Room‑Temperature and High‑Selectivity Detection of Ammonia

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Nano-Micro Letters 2021年第4期13卷 146-158页

作者： Tingqiang Yang Lingfeng Gao Wenxuan Wang Jianlong Kang Guanghui Zhao Delong Li Wen Chen Han Zhang Institute of Microscale Optoelectronics Collaborative Innovation Centre for Optoelectronic Science and TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro‑Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070People’s Republic of China Research Center for Materials Genome Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ammonia detection possesses great potential in atmosphere environmental protection,agriculture,industry,and rapid medical ***,it still remains a great challenge to balance the sensitivity,selectivity,working temperature,and response/recovery *** this work,Berlin green(BG)framework is demonstrated as a highly promising sensing material for ammonia detection by both density functional theory simulation and experimental gas sensing *** in BG framework offers abundant active sites for ammonia absorption,and the absorbed ammonia transfers sufficient electron to BG,arousing remarkable enhancement of *** BG framework shows remarkable response to ammonia at 50–110°C with the highest response at 80°C,which is jointly influenced by ammonia’s absorption onto BG surface and insertion into BG *** sensing performance of BG can hardly be achieved at room temperature due to its high *** of conductive Ti3CN MXene overcomes the high resistance of pure BG framework,and the simply prepared BG/Ti3CN mixture shows high selectivity to ammonia at room temperature with satisfying response/recovery speed.

关键词： Berlin green framework Gas sensor Ammonia Room temperature High selectivity

Reply to Comments on “Efficient full-path optical calculation of scalar and vector diffraction using the Bluestein method”

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Light(Science & Applications) 2021年第1期10卷 3-4页

作者： Yanlei Hu Zhongyu Wang Xuewen Wang Shengyun Ji Chenchu Zhang Jiawen Li Wulin Zhu Dong Wu Jiaru Chu CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrum entation of Anhui Higher Education InstitutesDepartm ent of Precision Machinery and Precision InstrumentationUniversity of Science and Techno logy of China230026 HefeiChina Departm ent of Mechanical Engineering and Departm ent of Civil and Environm ental Engineering Massachusetts Institute of TechnologyCam bridgeMA 02139USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology430070 WuhanChina Institute of Industry and Equipment Technology Hefei Uniersity of Technology230009 HefeiChina

Dear Editor,In *** present an efficient full-path optical calculation by using the Bluestein method.A real optical apparatus for laser processing,imaging,or optical tweezing normally involves diverse optical lenses with different physical and numerical apertures(NA).In such applications,the optical path is usually tortuous and *** assist in the design,evaluation,and alignment of optical instruments,it is advantageous to retrieve the optical field in an arbitrary position along the entire optical path,which is termed the full-path calculation in our paper,with sufficient accuracy and *** particular,high flexibility is required to accommodate the mismatch between optical apertures of different components in the optical *** present a fullpath optical calculation method by adopting the Bluestein method to address this realistic demand.

关键词： optical calculation method

High-Pressure And High-Temperature synthesis of Black Phosphorus-Graphite Anode Material for Lithium-Ion Batteries

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SSRN 2023年

作者： Cheng, Zhikang Tu, Bingtian Wu, Ye Huang, Haijun School of Science Wuhan University of Technology Hubei Wuhan430070 China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

Phosphorus-based materials with a high theoretical specific capacity and a fast charge-discharge rate are considered as promising anode materials for high energy density lithium-ion batteries (LIBs). Red phosphorus (RP) and black phosphorus (BP) are two main allotropes to be used as anode materials. However, huge volume expansion during charge-discharge processes hinders the application of RP and BP in LIBs. Composites of phosphorus and carbon-based materials have been extensively fabricated to withstand volume expansion of phosphorus and improve cycle performance. Here, composites of BP and graphite (BP-G) with three P-G mass ratios (8 : 2, 7 : 3, and 6 : 4) have been synthesized by a facile and scalable high-pressure and high-temperature (HPHT) method using RP and graphite composites (RP-G) prepared by ball milling as precursors. Their microstructure and bonding configurations have been analyzed by various characterization techniques. Among three RP-G composites, 7RP-3G exhibits the most excellent cycling stability, a high reversible capacity of 1331 mAh/g after 200 cycles at a current density of 0.78 A/g. However, RP-G composites show poor stability at high current densities. Among three BP-G composites, 6BP-4G shows the best cycle stability at high current densities, a reversible capacity of 634.6 mAh/g after 500 cycles at a current density of 2.6 A/g. Although, the reversible specific capacities of BP-G composites after long cycles are lower than those of RP-G, BP-G composites show more stable cycle performance than RP-G, especially at high current densities. The present work illustrates a direct and facile method to synthesize BP-G composites, and sheds light to explore new synthetic route of BP-based composites. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Strengthening Soft 45# Steel Through a Crn/W-Dlc/Dlc Multilayer Coating

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SSRN 2024年

作者： Luo, Guoqiang Xu, Xinyu Dong, Haoran Wei, Qinqin Tian, Feng Qin, Jianglin Shen, Qiang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Chaozhou521000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Hubei Wuhan430070 China State Owned Wuhan Xinyu Machine Factory Hubei Wuhan430060 China

Special equipment vehicles typically operate in complex environments, resulting in wear and failure of the chassis’s rotary seal shaft predominantly made of soft 45# steel. An effective strategy to extend the service life is to apply a hard coating on the working surface. However, previous research have primarily concentrated on the coating for hard high-speed steel, while the significant difference of physical characteristics between soft 45# steel and hard coating leads to a weak interface adhesion. This study produces a CrN/W-DLC/DLC multilayer coating on the soft 45# steel with strong interfacial adhesion and superior friction and wear property by tailoring the CrN transition layer thickness. The multilayer coating consists of five layers, a CrN transition layer, a Cr layer, a Cr/WC alternating layer, a W-DLC/DLC alternating layer, and the topmost DLC layer. Increasing the thickness of the transition layer improves the coating's hardness and adhesive strength. The 3CrN/W-DLC/DLC multilayer coating achieves the highest adhesive strength of 75N. The optimized CrN/W-DLC/DLC coating reduces the internal stress of the DLC coating and enhances its adhesion. Importantly, the average friction coefficient and wear cross-sectional area of the CrN/W-DLC/DLC multilayer coatings decrease accordingly. The 3CrN/W-DLC/DLC coating exhibits superior outstanding wear resistance evidenced by an average friction coefficient of 0.119 and a wear cross-sectional area of 100.55 μm2. A High proportion of sp2 bonds in the coating that are susceptible to graphitization and thicker transition layer that enhances the coating's support results in narrower wear traces. The oxidation wear and three-body abrasive wear as the main wear mechanisms. The work provides a significant promise for application in vehicle rotary seal components and a theoretical reference for improving the wear resistance of the seal surface. © 2024, The Authors. All rights reserved.

关键词： Hard coatings

Microstructural Evolution of Defects Under Proton Irradiation in Porous Cu

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SSRN 2023年

作者： Li, Honglin Wang, Hao Wen, Pin Huang, Zhifeng Yin, Guanchao Chen, Fei Hubei Longzhong Laboratory Xiangyang441106 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan430070 China Wuhan University of Technology China

The high specific strength and exceptional thermal insulating properties of porous metals make them an ideal choice for aerospace structural components and thermal insulation materials. However, in the space environment, proton irradiation leads to the formation of voids, bubbles, and dislocation loops, significantly compromising their physical and mechanical properties. To date, there has been limited attention to the radiation resistance properties in research related to porous metals. This study conducted proton irradiation experiments with a total dose of 1×1017 ions/cm2 on porous Cu. This study discusses and explains the irradiation-induced damage characteristics on the surface of porous Cu before and after proton irradiation. This provides insights into the radiation damage mechanisms within the porous Cu ligaments and the hydrogen release behavior on the ligament surface. Cascade recoil and collision-induced thermal spike effects modify material defect characteristics and crystal structure. This study elucidates the defect evolution mechanism of porous materials under proton irradiation, offering new insights for the design of other radiation-resistant porous materials as protective materials for future advanced space probes. © 2023, The Authors. All rights reserved.

关键词： Radiation damage