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Amorphous Titanium Dioxide and Polyaniline Dual Modifying Silicon for Highly Enhanced Lithium-Ion Storage

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SSRN 2024年

作者： Li, Yu Shi, Wen-Hua Yin, Zhi-Wen Wang, Meng Liu, Jing Hu, Zhi-Yi Li, Bei Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Research Center for Materials Genome Engineering Wuhan University of Technology Hubei Wuhan430070 China University of Namur NamurB-5000 Belgium

Silicon (Si) anode material is promising in the next generation of lithium-ion batteries (LIBs) with high energy densities for its much higher capacity (4200 mAh/g) than that of commercial graphite (372 mAh/g). However, silicon anode material with low electronic conductivity suffers a huge volume variation and accompanies side reactions during alloyed and de-alloyed process. Here, we design an inner amorphous titanium dioxide (TiO2) and an outer flexible conductive polyaniline (PANI) network dual modified Si@TiO2@PANI material for LIBs, where the TiO2 avoids the side reactions and the PANI network layer buffers the volume expansion and increases the electronic conductivity. The as-prepared Si@TiO2@PANI exhibits a high initial discharge capacity of 3050 mAh/g and maintains 1583 mAh/g after 200 cycles at 0.5 A/g. It even delivers the discharge capacity of 1002 mAh/g after 600 cycles at 1 A/g, as well as an excellent rate ability with discharge capacity of 1890, 1260 and 432 mAh/g at the high current density of 1, 2 and 5 A/g, respectively. Our strategy shows that the innovative design of double buffer layers on Si can synergistically promote stability and accelerate kinetics of Li+ transport, offering novel resolution strategy to enhance the performance of Si-based anodes for LIBs. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

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

A multi-band and polarization-independent perfect absorber based on Dirac semimetals circles and semi-ellipses array

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Chinese Physics B 2021年第9期30卷 574-578页

作者： Zhiyou Li Yingting Yi Danyang Xu Hua Yang Zao Yi Xifang Chen Yougen Yi Jianguo Zhang Pinghui Wu Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronics Central South UniversityChangsha 410083China College of Science Zhejiang University of TechnologyHangzhou 310023China Department of Physics and Electronic Engineering Jinzhong UniversityJinzhong 030619China Research Center for Photonic Technology Key Laboratory of Information Functional Material for Fujian Higher EducationQuanzhou Normal UniversityQuanzhou 362000China

We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal(BDS).It is composed of a Dirac material layer,a gold reflecting layer,and a photonic crystal slab(PCS)medium *** structure achieved perfect absorption of over 97%at 4.06 THz,6.15 THz,and 8.16 *** high absorption can be explained by the localized surface plasmon resonance(LSPR).And this conclusion can be proved by the detailed design of the surface ***,the resonant frequency of the device can be dynamically tuned by changing the Fermi energy of the *** to the advantages such as high absorption,adjustable resonance,and anti-interference of incident angle and polarization mode,the Dirac semi-metal perfect absorber(DSPA)has great potential value in fields such as biochemical sensing,information communication,and nondestructive detection.

关键词： metamaterials terahertz block Dirac semi-metal localized surface plasmon resonance

In Situ Programming Acid-Base Pair Proton-Conductive Channels of Perfluorosulfonic Acid Membrane for Fuel Cells

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SSRN 2022年

作者： Zhang, Wenxing Zhao, Shengqiu Wang, Rui Zhang, Aojie Huang, Yi Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Automotive Safety and Energy School of vehicle and Mobility Tsinghua University Beijing100084 China

The development of rapid and dependable proton transport channels is crucial for proton exchange membrane fuel cells (PEMFCs) operating in low humidity conditions. Herein, an NH-Zr framework rich in basic sites was constructed in situ in a perfluorosulfonic acid solution, and PFSA-NH-Zr hybrid proton exchange membranes were prepared. The introduced NH-Zr framework successfully induced proton conducting groups (-SO3H) reorganization along the NH-Zr framework, resulting in the formation of fast ion transport channels. Meanwhile, under low humidity, the acid-base pairs between N-H (N-H-Zr framework) and -SO3H (PFSA) promoted the protonation/deprotonation and the subsequent proton leap via the Grotthuss processes. Especially, the hybrid membrane PFSA-NH-Zr-1 with suitable NH-Zr content had a promising proton conductivity of 0.031 S/cm at 80°C, 40% RH, and 0.292 S/cm at 80°C, 100% RH, which were approximately 33% and 40% higher than the pristine PFSA membrane (0.023 S/cm and 0.209 S/cm), respectively. In addition, the maximum power density of the hybrid PEM was 0.726 W/cm2, which was nearly 20% higher than the pristine PFSA membrane (0.604 W/cm2) under 80°C, 40% RH. This work established a referable strategy for developing high-performance proton exchange membranes under low RH conditions. © 2022, The Authors. All rights reserved.

关键词： Proton conductivity

ZIF-8/LiFePO4 derived Fe-N-P Co-doped carbon nanotube encapsulated Fe2P nanoparticles for efficient oxygen reduction and Zn-air batteries

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Nano Research 2020年第3期13卷 818-823页

作者： Huihui Jin Huang Zhou Pengxia Ji Chengtian Zhang Jiahuan Luo Weihao Zeng Chenxi Hu Daping He Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China Department of Chemical and Environmental Engineering Anyang Institute of TechnologyAnyang 455000China

Iron-based oxygen reduction reaction(ORR)catalysts have been the focus of research,and iron sources play an important role for the preparation of efficient ORR ***,we successfully use LiFePO4 as ideal sources of Fe and P to construct the heteroatom doped Fe-based carbon *** obtained Fe-N-P co-doped coral-like carbon nanotube arrays encapsulated Fe2P catalyst(C-ZIF/LFP)shows very high half-wave potential of 0.88 V in alkaline electrolytes toward ORR,superior to Pt/C(0.85 V),and also presents a high half-wave potential of 0.74 V in acidic electrolytes,comparable to Pt/C(0.8 V).When further applied into a home-made Zn-air battery as cathode,a peak power density of 140 mW·cm^-2 is reached,exceeds commercial Pt/C(110 mW·cm^-2).Besides,it also presents exceptional durability and methanol resistance compared with Pt/***,the preparation method of such a high-performance catalyst is simple and easy to optimize,suitable for the large-scale ***’s more,it opens up a more sustainable development scenario to reduce the hazardous wastes such as LiFePO4 by directly using them for preparing high-performance ORR catalysts.

关键词： LiFePO4 waste utilization ZIF-8 heteroatoms-doped oxygen reduction reaction

Hard Carbon with Embedded Graphitic Nanofibers for Fast-Charge Sodium-Ion Batteries

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SSRN 2024年

作者： Wang, Ke Li, Mengjun Zhu, Zhu Ai, Wei Wu, Han Wang, Bingwu He, Pan Xie, Dong Wu, Jinsong Huang, Wei Frontiers Science Center for Flexible Electronics Shaanxi Institute of Flexible Electronics Northwestern Polytechnical University Xi’an710072 China Nanostructure Research Center State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China Nanjing University of Posts and Telecommunications China

关键词： Diffusion

Control of the proximity of bifunctional [email protected] 2 O 3 catalysts for efficient methanol conversion into hydrocarbons

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Catalysis Today 2022年 405-406卷 82-91页

作者： Jia-Min Lyu Shen Yu Zhao Peng Jian Zhou Zhan Liu Xiao-Yun Li Yu-Li Li-Hua Chen Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Shanghai Research Institute of Petrochemical Technology SINOPEC Shanghai 201208 China State Key Laboratory of Silicate Materials for Architecture Wuhan University of Technology Wuhan 430070 Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur Namur B-5000 Namur Belgium

Bifunctional catalysts are widely applied for many important reactions as the synergetic effect of two types of active sites remarkably improves catalysis performance. However, their bifunctionality has not been fully exploited since the proximity of bifunctional catalysts is hard to control. Herein, we demonstrate a bifunctional [email protected] 2 O 3 catalyst with a core-shell structure and a nano-scale proximity by in-situ growth of γ-Al 2 O 3 nanosheets on the surface of ZSM-5 crystals for methanol conversion. The nano-scale proximity endows the catalyst with higher reaction activity and C 2 –C 3 olefins yield (53 %) in comparison to the catalysts with micro-scale proximity (20 %) and millimeter-scale proximity (27 %), which can be attributed to the fluent transport of the reaction intermediates between two types of active sites. This strategy for constructing bifunctional catalysts with nano-scale proximity is conducive to understanding the relationship between proximity and catalytic performance in methanol conversion.

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Enhanced Ablation Resistance of Carbon Fiber Reinforced Phenolic Composites Through Designing In-Plane Heat Conduction And Out-of-Plane Heat Insulation Channels

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SSRN 2024年

作者： Chen, Xiang Shi, Kui Gu, Ziwen Quan, Huafeng Huang, Dong Zhang, Yuefeng Li, Tongqi Ye, Chong Fan, Zhen Zhu, Shipeng Liu, Jinshui Peng, Chaoyi Tao, Lei College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha410082 China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha410000 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing100076 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Zhuzhou Times New Material Technology Co. Ltd. Zhuzhou412007 China China Academy of Launch Vehicle Technology China

With the development of near-space vehicles toward higher Mach speeds, the aerodynamic heating problem poses an increasingly serious challenge to thermal protection system, and thus it is urgent to further improve the ablation resistance of carbon fiber reinforced phenolic resin (CF/PR). To achieve this, an innovative composite was prepared using mesophase-pitch-based carbon fiber as a reinforcement to construct the in-plane heat transfer channels. The thermal conductivities of composite in in-plane (λi) and out-of-plane (λo) directions were 24.37 W·m-1·K-1 and 0.96 W·m-1·K-1, respectively, and the ratio(λi/λo) is up to 25.39, which plays a positive role in enhancing the heat dissipation of ablation center while maintaining effective interlayer insulation. During ablation, the composite exhibits a 159 °C lower stagnation-point temperature compared to the control group, and the maximum and average temperature on its backside decrease 196 °C and 201 °C, respectively. Consequently, the mass ablation rate and the line ablation rate of composite are reduced by 72.5% and 87.6%, respectively. The anisotropic thermal behavior and higher λi/λo value contribute to the decrease of the stagnation-point temperature, the maximum temperature and the average temperature on the backside, thereby improving the ablation resistance of composite. © 2024, The Authors. All rights reserved.

关键词： Ablation

Enhancing the Humidity Resistance of Perovskite Photovoltaics: Comprehensive PbI2 Management Utilizing Long-Chain Ionic Liquid

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SSRN 2024年

作者： Sun, Yonggui Wang, Fei Lu, Lu Wang, Taomiao Yang, Guo Liang, Xiao Zhou, Xianfang Sun, Xiaokang Li, Qiannan Li, Yongjun Zhang, Fan Duan, Dawei Zhu, Jiajie Zhu, Quanyao Hu, Ruiyuan Yuan, Mingjian Hu, Hanlin Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University 7098 Liuxian Boulevard Shenzhen518055 China Nanjing University of Posts and Telecommunications Nanjing210023 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan China Shenzhen University China College of Chemistry Nankai University Tianjin China

Effectively managing residual PbI2 in two-step perovskite fabrication, while simultaneously enhancing the device performance, especially its humidity stability, poses a significant challenge. Herein, we introduced a novel ionic liquid (IL) molecule, long-chain alkane-based 1-octyl-3-methylimidazolium chloride (OMIMCl), with excellent hydrophobicity to regulate the perovskite conversion process, aiming to enhance the performance of resulting perovskite solar cells. The introduction of OMIMCl contributes to the formation of a uniform porous PbI2 film, facilitating comprehensive penetration of the second-step organic salt to fully convert PbI2 into perovskite material. Interestingly, nearly no residual PbI2 clusters are observed at both the top and bottom surfaces of OMIMCl-modified perovskite films. Meanwhile, depth-resolved grazing incidence wide-angle x-ray scattering (GIWAXS) measurements have quantitatively demonstrated the reduction of PbI2 in OMIMCl-modified perovskite thin films. Notably, the incorporation of OMIMCl retards the growth rate of perovskite crystals efficiently, thereby assisting in generating high-quality of perovskite films with larger grain size. Moreover, density functional theory (DFT) calculations of binding energy numerically demonstrate the hydrophobic property of IL OMIMCl, which plays a crucial role in improving the humidity stability of PSCs, as evidenced by direct water-dipping test. Consequently, we achieved a champion power conversion efficiency (PCE) of 24.72% and significantly improved long-term stability. © 2024, The Authors. All rights reserved.

关键词： Lead compounds