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Improving the Ohmic Polarization of High-Temperature Proton Exchange Membrane Fuel Cells Using Crosslinked Polybenzimidazole Membranes Containing Acidophilic Quaternary Ammonium Groups by One-Step Strategy

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SSRN 2023年

作者： Li, Jin Liu, Guoliang Zhang, Fangfang Liao, Jun 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 Hubei Key Laboratory of Fuel Cell Technology Wuhan University of Technology Wuhan430070 China School of Nuclear Technology and Chemistry & Biology Hubei University of Science and Technology Nr. 88 Xianning Avenue Xianning437100 China Hubei Han-Tech Co. Ltd Nr. 116 Linju Street Yuanan444200 China

Ingenious crosslinked network structure in phosphoric acid doped polybenzimidazole membranes can mitigate the mutual restriction of proton conductivity and mechanical properties. However, the complicated synthesis of tailored macromolecular crosslinker and the time-consuming post-treatment hinder their practical application as high temperature proton exchange membranes. Herein, crosslinked polybenzimidazole membranes are synthesized using small molecular crosslinker containing acidophilic quaternary ammonium groups through a one-step crosslinking strategy. After doping with phosphoric acid, the quaternary ammonium-biphosphate ion-pair coordination and the crosslinked structure result in the improved anhydrous proton conductivity, oxidation stability, and mechanical strength of the formed membranes compared to un-crosslinked sample. Membrane with the optimized degree of crosslinking exhibits an anhydrous conductivity of 72.27 mScm-1 at 160 oC with a tensile strength of 12.14 MPa. Benefiting from the crosslinked structure and the high proton conductivity, the accordingly formed membrane electrode assembly possesses a high open circuit voltage of 1.01 V and an improved Ohmic polarization, delivering a peak power density of 0.66 Wcm-2 using hydrogen as fuel and air as oxidant. © 2023, The Authors. All rights reserved.

关键词： Proton conductivity

Fabrication and Luminescence Properties of Rare-Earth (Re= Ho3+, Er3+, Tm3+) Doped Y2zr2o7 Transparent Ceramics For Infrared Applications

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SSRN 2023年

作者： Han, Wenhan Lu, Kailei Li, Shirui Lai, Xiangpeng Xiao, Yuhang Peng, Weiqian Li, Weiwei Lu, Tiecheng Ye, Yucheng Qi, Jianqi College of Physics Sichuan University Chengdu610064 China Key Laboratory of High Energy Density Physics of Ministry of Education Sichuan University Sichuan Chengdu610064 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Key Laboratory of Radiation Physics and Technology of Ministry of Education Sichuan University Sichuan Chengdu610064 China School of Biomedical Sciences LKS Faculty of Medicine University of Hong Kong Hong Kong

The fabrication of infrared photoluminescent transparent ceramics with excellent performance has been attracted wide attention. Thereinto, selecting suitable host material and luminescent ions is the premise of achieving excellent optical performance. In this work, based on Y2Zr2O7 as host material, a series of single phase rare-earth (RE= Ho3+, Er3+, Tm3+) doped transparent ceramics were prepared via solid-state reaction and vacuum sintering method, which obtained the highest transmittance (＞75%) in visible and near infrared regions. Through the study of photoluminescence characteristics, strong down-conversion infrared emissions of the rare-earth ions were observed. Combining with the excellent optical properties and relatively simple preparation method, Ho3+/Er3+/Tm3+ doped Y2Zr2O7 transparent ceramics, as novel infrared phosphor materials of A2B2O7 system, can find potential applications in the field of biomedicine, laser application and lighting, etc. © 2023, The Authors. All rights reserved.

关键词： Erbium compounds

Cu catalysts detour hydrogen evolution reaction

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Matter 2022年第8期5卷 2537-2540页

作者： Ying Dong Jing Li Xiao-Yu Yang Department of Forensic Medicine Huazhong University of Science and Technology 13 Hangkong Road Wuhan 430030 China Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA

The use of electrocatalytic reactions in aqueous solution to produce high-value chemicals is severely restricted by the occurrence of the electrochemical reaction of water. In a recent study published in Nature Nanotechnology by Haotian Wang and colleagues, hydrophilic-hydrophobic Cu catalysts, which suppress the undesirable hydrogen evolution reaction, have been discovered to promote conversion of 99% nitrate at an industrial wastewater level into ammonia using an industrial-relevant reduction current of 1 A/cm 2 .

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Optimizing Photocatalytic Performance: Composition-Dependent Methylene Blue Degradation Using Green-Synthesized Nanographene Oxide–Manganese Oxide Nanocomposites

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SSRN 2025年

作者： Mathew, Shanty Madanu, Thomas L. Kuriakose, Anna Kathyayini, H. Chandran, Ashly P. Su, Bao-Lian Colomer, Jean Francois St. Joseph’s Research Institute Shanthinagar Bengaluru India Department of Chemistry Sir M. Visvesvaraya Institute of Technology Off International Airport Road Bengaluru562157 India Centre for Incubation Innovation Research and Consultancy Jyothy Institute of Technology Thataguni Bengaluru India University of Namur Rue de Bruxelles 61 NamurB- 5000 Belgium University of Namur Rue de Bruxelles 61 NamurB-5000 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

The presence of toxic dye compounds in industrial effluents poses a significant environmental and public health challenge. Therefore, sustainable techniques for the removal of dyes from wastewater, particularly from the printing and dyeing industries, are in high demand. Photocatalysis using nanocomposites has emerged as a promising solution to this issue. In this study, nanographene oxide-manganese oxide (NGO-Mn₃O₄) nanocomposites were synthesized using the sol-gel method in three different weight ratios: 1:9, 1:1, and 9:1. The crystalline structure, morphological features, and optical properties of these nanocomposites were characterized using powder X-ray diffraction (PXRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Ultraviolet-visible Diffuse Reflectance Spectroscopy (UV-vis DRS). The photocatalytic performance of the NGO-Mn₃O₄ nanocomposites was evaluated by examining the degradation of methylene blue, a thiazine dye, under UV radiation at a wavelength of 254 nm. Among the three compositions, the 9:1 NGO-Mn₃O₄ nanocomposite exhibited excellent dye degradation with 96% efficiency in just 10 minutes. The study also revealed that composites with a lower band gap demonstrated enhanced photodegradation activity. © 2025, The Authors. All rights reserved.

关键词： Sol-gel process

synthesis and Characterization of Red Emissive Carbon Quantum Dots for Mb Degradation

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SSRN 2024年

作者： Khojiev, Shokir Khojieva, Gulmira Chen, Dan Chen, Jun Mohamed, Hemdan S.H. Liu, Jing Li, Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China School of International Education Wuhan University of Technology Wuhan430070 China Center for Advanced Technology under Agency for Innovative Development of the Republic of Uzbekistan The Ministry of Higher Education Science and Innovation University Street 3A Tashkent100174 Uzbekistan Department of Physical Chemistry Faculty of Chemistry National University of Uzbekistan University Street 4 Tashkent100174 Uzbekistan Physics Department Faculty of Science Fayoum University El Gomhoria Street Fayoum63514 Egypt

The one-step solvothermal method for the synthesis of R-CQDs by using 1,3-naphthalenediol was used. R-CQDs have an average particle size of 5nm with the functional groups, the presence of both D and G bands signifies successful construction of CQDs with sp2 core and sp3 hybridised matrix. R-CQDs exhibit a wide absorption peak at 512nm, while the emission intensity is highest at 610nm. R-CQDs show high photocatalytic performance for the photodegradation efficiency of 96% in 180 min. Its photocatalytic degradation rate constant was as 0.0167 min−1. R-CQDs demonstrated uniformly performance, making them superior photocatalyst in a variety of pH media. © 2024, The Authors. All rights reserved.

关键词： Degradation

Resistive-switching tunability with size-dependent all-inorganic zero-dimensional tetrahedrite quantum dots

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Science China materials 2020年第12期63卷 2497-2508页

作者： Zhiqing Wang Yueli Liu Jie Shen Wen Chen Jun Miao Ang Li Ke Liu Jing Zhou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

All-inorganic zero-dimensional(0D)tetrahedrite(Cu12Sb4S13,CAS)quantum dots(QDs)have attracted extensive attention due to their excellent optical properties,bandgap tunability,and carrier *** this paper,various sized CAS QDs(5.1,6.7,and 7.9 nm)are applied as a switching layer with the structure F:Sn O2(FTO)/CAS QDs/Au,and in doing so,the nonvolatile resistive-switching behavior of electronics based on CAS QDs is *** SET/RESET voltage tunability with size dependency is observed for memory devices based on CAS QDs for the first *** suggest that differently sized CAS QDs result in different band structures and the regulation of the SET/RESET voltage occurs simply and effectively due to the uniform size of the CAS ***,the presented memory devices have reliable bipolar resistive-switching properties,a resistance(ON/OFF)ratio larger than 104,high reproducibility,and good data retention *** 1.4×10^6s of stability testing and 104cycles of quick read tests,the change rate of the ON/OFF ratio is smaller than 0.1%.Furthermore,resistiveswitching stability can be improved by ensuring a uniform particle size for the CAS *** theoretical calculations suggest that the space-charge-limited currents(SCLCs),which are functioned by Cu 3d,Cu 3p and S 3p to act as electron selftrapping centers due to their quantum confinement and form conduction pathways under an electric field,are responsible for the resistive-switching *** paper demonstrates that CAS QDs are promising as a novel resistive-switching material in memory devices and can be used to facilitate the application of next-generation nonvolatile memory.

关键词： memory device tetrahedrite quantum dots resistive-switching tunability resistance mechanism

Highly sensitive strain sensor from topological-structure modulated dielectric elastic nanocomposites

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arXiv

arXiv 2021年

作者： Fan, Youjun Shen, Zhonghui Zhou, Xinchen Dan, Zhenkang Zhou, Le Ren, Weibin Tang, Tongxiang Bao, Shanyong Nan, Cewen Shen, Yang State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Center for Flexible Electronics Technology Tsinghua University Beijing100084 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China

Flexible strain sensors are critical to several potential intelligent applications, such as human-machine interfaces, soft robotics, human motion detection, and safety monitoring of components. Stretchable functional materials are important components of strain sensors, and they are still major challenges for high performance strain sensors. Herein, we demonstrate a novel strategy of designing and optimizing flexible strain sensor by developing topological structure modulated high permittivity elastic nanocomposite. The topological structure with three-phase percolative nano-nanonetworks produces synergistic effects of space charge enhancement and local electric field modulation, and it gives rise to an ultrahigh dielectric permittivity (113.4, at 1 kHz, over 1500% enhancement than that of commercial elastic polyurethane matrix) and excellent comprehensive electromechanical performance, and the optimal comprehensive electromechanical performance reaches to 542.91 MPa-1, which is over 9-fold than that of commercial polyurethane elastic film. An interdigital capacitive strain sensor is designed using the topological structured elastic dielectric nanocomposite. It possesses high initial capacitance density and positive capacitance response with stain, achieving high signal-to-noise ratio, high capacitance response sensitivity, and wide linear range, and it breaks through disadvantages of negative sensitivity and narrow linear range for conventional interdigital strain sensors. The prepared integrated strain sensor arrays are able to measure local strain of convoluted surfaces and monitor the motion of soft actuators in real time, and they would make conditions for intelligent control systems and the study of morphological intelligence. Copyright © 2021, The Authors. All rights reserved.

关键词： Nanocomposites

Green N1 Additive Modified Perovskite Precursor Enables Effective Manufacturing of Large-Area Solar Cell Modules with High Efficiency and Stability

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SSRN 2023年

作者： Zang, Yue Shao, Tianxiang Jiao, Chuanjia Zhou, Peng Li, Wangnan Cheng, Jiahao Yang, Gaoyuan Tu, Yibo Ye, Jingchuan Li, Guodong Chu, Liang Lu, Shaojian Liang, Guijie Liang, Ying Wang, Jingyang Zhong, Zhicheng Hu, Run Yan, Wensheng Institute of Carbon Neutrality and New Energy School of Electronics and Information Hangzhou Dianzi University Hangzhou310018 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China Hubei Longzhong laboratory Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China

Perovskite solar cells (PSCs) have been continuously breaking the solar photoelectric power conversion efficiency (PCE) record, while two long-standing challenges remain formidable on the practical commercialization path of PSCs, i.e. effective large-area manufacturing and high device operational stability. Here, we report a green additive of N-methyl-2-piperidone (N1) to modify the perovskite precursor, enabling the one-step mass manufacturing of high-quality large-area perovskite films with enhanced PCE and operational stability. The results show that due to the stronger complexation ability of N1 additive with PbI2, the generated PbI2-N1 complex can effectively prevent the preferential nucleation and realize lead halide-framework template-assistant crystallization reaction with organic cation in the one-step solution preparation of perovskite (FAPbI3)0.95(MAPbBr3)0.05 thin films, which result in the uniform grain size and smooth, dense film quality. Therefore, the PSCs device with small active area of 0.09 cm2 exhibits an efficiency of 22.2%, which is further improved to 23.2% by passivating the perovskite interface using PEAI. Moreover, highly-efficient slot-die printed 5×5 cm2 PSC module has been obtained with a champion PCE of 21% and improved operational stability over 1000 h. This work demonstrated a new strategy to realize high-quality large-scale perovskite films for solution-processed PSC modules, and may be further improved and extended to other kinds of PSCs and perovskite light-emitting diodes and detectors. © 2023, The Authors. All rights reserved.

关键词： Nucleation

Defect Control Based on Interfacial Passivation Via Post-Treatment of 1-Ethylpyridine Hydrobromide for Achieving Efficient and Stable Perovskite Solar Cells

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SSRN 2022年

作者： Xia, Tian Jiang, Bo Liu, Weiting Li, Xingyu Dong, Haiyue Tian, Nan Zheng, Guoyuan Peng, Yong Yao, Disheng Long, Fei School of Materials Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Optical and Electronic Materials and Devices School of Materials Science and Engineering Guilin University of Technology 12 Jiangan Road Guilin541004 China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guilin541004 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The carrier recombination caused by a series of crystal defects in perovskite materials is still the main obstacle to further improve the photoelectric conversion efficiency. Herein, as an agent for interfacial engineering, 1-ethylpyridine hydrobromide (EPB) was employed to treat the FA1-xMAxPbI3-yBry perovskite film using a two-step sequential deposition method. The influence and mechanism of the post-treatment with EPB on the film properties and photovoltaic performance of the relevant perovskite solar cells (PSCs) were studied. The champion EPB-treated perovskite solar cell achieved a remarkable power conversion efficiency (PCE) of 20.71% with an enhanced short current density (Jsc) of 24.14 mA cm-2, which is higher than that (PCE=18.85%, Jsc=23.40 mA cm-2) of the pristine device without EPB. The nitrogen (N) atom in EPB exhibits a strong coordination with lead (Pb) from the perovskite, which reduces defect density and suppresses non-radiative recombination for achieving high-performance PSCs. The UV-vis and UPS results reveal that the effective passivation effect of EPB significantly eliminates the interfacial barrier that inhibits charge transport and improve operational stability of PSCs. As a result, The PCE of the EPB-treated device remains more than 90% of the initial efficiency after 400 hours of unpackaged and about 40% ambient humidity. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells