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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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Cu在纳米结构PtNi上的表面可控锚定用于高效海水产氢

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中国科学：材料科学（英文版） 2023年第10期66卷 3887-3894页

作者：杨雄肖宇轩陈江波余菲田歌蒲福飞章嵩 Susana I.Córdoba de Torresi Mark D.Symes Christoph Janiak 阳晓宇 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & International School of Materials Science and Engineering and Processing Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Instituto de Química Universidade de Sao Paulo Av. Prof. Lineu Prestes 748 05508-080 São Paulo SP Brazil WestCHEM School of Chemistry University of Glasgow Glasgow G12 8QQ United Kingdom Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf Düsseldorf 40204 Germany

表面组分调控及建立多功能活性位点是提高Pt基催化剂性能的有效途径.通过将Cu可控地锚定在纳米结构PtNi表面(Cu/PtNi)可以精确控制Pt基催化剂表面元素的化学计量比,其中亲氧的非贵金属Ni能加速水的解离,Pt由于具有适中的H吸附能,可有效... 详细信息

表面组分调控及建立多功能活性位点是提高Pt基催化剂性能的有效途径.通过将Cu可控地锚定在纳米结构PtNi表面(Cu/PtNi)可以精确控制Pt基催化剂表面元素的化学计量比,其中亲氧的非贵金属Ni能加速水的解离,Pt由于具有适中的H吸附能,可有效地将游离态的H转换成氢气,Cu由于具有正的H吸附吉布斯自由能(AGH*),有助于H2的脱附.其中具有最优组分比例的Cu/PtNi电催化剂在海水中表现出优异的电化学析氢活性和稳定性,在碱性海水中,10 mA cm-2下的过电位为23 mV(在70 mV过电位下,其质量活性是商用Pt/C的5倍).同时,密度泛函理论结果进一步验证了在碱性海水中Pt,Ni和Cu多功能金属活性位点可提高HER的H2O解离、H*吸附和H2脱附的过程.

关键词： Cu/PtNi seawater hydrogen evolution surface adjustment multifunction sites hierarchical structure

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In-situ S/TEM Investigations of Domain and Phase Transitions in Polarized Cu2Se

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Bai, Hui Luo, Hao Yang, Dongwang Wu, Jinsong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Nanostructure Research Center Wuhan University of Technology Wuhan China

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Achieving superior performance in thermoelectric Bi_(0.4)Sb_(1.6)Te_(3.72)by enhancing texture and inducing high-density line defects

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Science China materials 2021年第6期64卷 1507-1520页

作者： Junhao Qiu Yonggao Yan Hongyao Xie Tingting Luo Fanjie Xia Lei Yao Min Zhang Ting Zhu Gangjian Tan Xianli Su Jinsong Wu Ctirad Uher Hongyi Jiang Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry University of NorthwesternEvanstonIllinois 60208United States Nanostructure Research Center Wuhan University of TechnologyWuhan 430070China Department of Physics University of MichiganAnn ArborMichigan 48109United States

Miniaturization of efficient thermoelectric(TE)devices has long been hindered by the weak mechanical strength and insufficient heat-to-electricity conversion efficiency of zone-melted(ZM)***,we successfully prepared a robust high-performance p-type Bi_(0.4)Sb_(1.6)Te_(3.72)bulk alloy by combining an ultrafast thermal explosion reaction with the spark plasma sintering(TER-SPS)*** is observed that the introduced excess Te not only enhances the(00l)-oriented texture to ensure an outstanding power factor(PF)of 5 mW m^(−1)K^(−2),but also induces extremely high-density line defects of up to 10^(11)–10^(12)cm^(−2).Benefiting from such heavily dense line defects,the enhancement of the electronic thermal conductance from the increased electron mobility is fully compensated by the stronger phonon scattering,leading to an evident net reduction in total thermal *** a result,a superior ZT value of~1.4 at 350 K is achieved,which is 40%higher than that of commercial ZM ***,owing to the strengthening of grain refinement and highdensity line defects,the mechanical compressive stress reaches up to 94 MPa,which is 154%more than that of commercial single *** research presents an effective strategy for the collaborative optimization of the texture,TE performance,and mechanical strength of Bi2Te3-based *** such,the present study contributes significantly to the future commercial development of miniature TE devices.

关键词： thermoelectric Bi_(2)Te_(3) texture line defect micro device

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All Green Solvent Engineering of Organic-Inorganic Hybrid Perovskite Layer for High-Performance Solar Cells

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SSRN 2022年

作者： Wei, Jinquan Cao, Xiaobing Hao, Lei Liu, Zijin Su, Gengyang He, Xin Zeng, Qingguang School of Applied Physics and Materials Wuyi University Jiangmen529020 China School of Textile Materials and Engineering Wuyi University Jiangmen529020 China State Key Lab of New Ceramics and Fine Processing Education Ministry Key Laboratory for Advanced Materials Processing Technology School of Materials Science and Engineering Tsinghua University Beijing100084 China

Solvent engineering technology is an important approach for fabrication of high quality perovskite films, and thereby high-performance perovskite solar cells (PSCs). However, it is strongly dependent on the usage of toxic solvents, including the host solvent and anti-solvent to prepare perovskite solutions and control the crystallization of perovskite films, respectively. The usage of toxic solvents poses a serious threat to the health of manufactures and the safety of environment. Therefore, the solvent toxicity has become a burning issue before the forthcoming commercialization of PSCs. Here, we report an all green solvent engineering to prepare high quality (FAPbI3)1-x(MAPbBr3)x (x=0, 0.05) films, where a green Lewis base solvent of triethyl phosphate (TEP) is used to prepare (FAPbI3)1-x(MAPbBr3)x/TEP solution, and a non-polar solvent of dibutyl ether (DEE) is used as anti-solvent. In this approach, a new intermediate phase film is formed after spin-coating the (FAPbI3)1-x(MAPbBr3)x/TEP solution on substrates, followed by dropping of DEE during spinning, and subsequently convert into perovskite films by annealing. Finally, it enables a PCE of 18.65% (x=0) and 20.13% (x=0.05) basing on a typical device configuration of FTO/SnO2/Perovskite/Spiro-OMeTAD/Au, which is the highest value for the all green solvent processed PSCs. More importantly, the all green solvent engineering approach can also be used to prepare another typical perovskite of MAPbI3 films for efficient solar cells. Therefore, this work not only provides an universial approach to prepare typical organic-inorganic hybrid perovskite films, but also addresses the solvent toxicity during the production of perovskite films. The green solvent engineering may pave the way for future industrial scale production of PSCs under environment friendly conditions. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Evolution characteristics of multi-physical fields distributions during the whole life cycle of PEMFC

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Chemical Engineering Journal 2025年 518卷

作者： Panxing Jiang Fan Wu WanQiu Yu Zhiping Huang XinHao Huang Zhigang Zhan Shang Li Mu Pan School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China

The membrane electrode assembly (MEA) aging of proton exchange membrane fuel cell (PEMFC) is reflected as its variations in compositions and microstructures, which leads to changes in the distributions of multi-physical fields and the performance of the cell. In this study, we utilized the results of a series of single-cell aging experiments and characterizations to obtain the evolution values of the main material properties during the whole life cycle, and on this basis, we simulated the evolution characteristics of the distributions of multi-physical fields. The main conclusions are as follows: the open-circuit voltage, and the specific active surface area, contact angle in cathode catalyst layer (CCL) generally exhibit a gradual decline during the life cycle, with reduction ratios of 9.6 %, 70.8 %, and 8.3 %, respectively; while the contact resistance and porosity in CCL increase progressively, with the ratios of 16.4 % and 20 %, respectively. Owing to the evolution of the open-circuit voltage and specific active surface area, the value and distribution of the CL local potential vary significantly. In contrast, the gas/water/temperature fields within the cell do not change significantly mainly due to the influence of constant middle current density and other operating conditions. The regions with the highest oxygen concentration and highest local voltage coincide with the region of the most severely aged region and the most clearly leaked point area, which exhibits obvious correlations among nonuniform degradation of MEA, physical field distribution and performance changes throughout the whole life of the fuel cell.

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Co Gradient Li-Rich Cathode Relieving the Capacity Decay in Lithium-Ion Batteries

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SSRN 2022年

作者： Wang, Hong Liu, Fang Yu, Ruohan Xiao, Zhitong Zhu, Zhu Zhou, Liang Wu, Jinsong Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China School of Mathematics and Physics Jingchu University of Technology Jingmen448000 China Shenzhen Institute Wuhan University of Technology Guangdong Shenzhen518000 China

Lithium-rich layered oxides (LLOs) are one of the promising cathode materials for next generation energy storage devices, but structural degradation and severe capacity decay during cycling have hindered applications. Here, we find cobalt effectively mitigate structural degradation and develop a simple and novel metal organic framework (MOF) treatment and surface reconstruction method to fabricate Co gradient layer on LLOs. In situ and ex situ microstructural studies show the capacity decay is mainly originated from the formation of microstructural defects such as voids and pores, continuous oxygen release and formation of spinel and rock-salt structure initiated from the surface. The reconstruction leads to the formation of an artificial layer of Co rich and Li poor spinel (Co3O4) and rock-salt (CoO) structure on surface, suppressing the diffusion of cations and O−1/O−2 anions toward the surface during cycling. The LLO-Co cathode exhibits enhanced cycling stability with a capacity retention of 94.4% at 0.2 C after 100 cycles and a high capacity of 183 mAhg−1 at 1 C, in comparison with those of untreated LLO (80.5% and 153 mAhg−1). This work sheds lights on better utilize rare Co resource in the development of high capacity and cyclability cathode materials for lithium-ion batteries. © 2022, The Authors. All rights reserved.

关键词： Cathodes

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Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity

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Science Bulletin 2020年第14期65卷 1154-1162,M0003页

作者： Zhiquan Hu Qiu He Ziang Liu Xiong Liu Mingsheng Qin Bo Wen Wenchao Shi Yan Zhao Qi Li Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Niobium pentoxide;Ion and electron transport;Mass loading;Areal capacity;Lithium-ion batteryNiobium pentoxide(Nb2 O5) has attracted great attention as an anode for lithium-ion battery, which is attributed to the high-rate and good stability performances. In this work, TT-, T-, M-, and H-Nb2 O5 microspheres were synthesized by a facile one-step thermal oxidation method. Ion and electron transport properties of Nb2 O5 with different phases were investigated by both electrochemical analyses and density functional theoretical calculations. Without nanostructuring and carbon modification, the tetragonal Nb2 O5(M-Nb2 O5) displays preferable rate capability(121 m Ah g^-1 at 5 A g^-1), enhanced reversible capacity(163 m Ah g^-1 at 0.2 A g^-1) and better cycling stability(82.3% capacity retention after 1000 cycles)when compared with TT-, T-, and H-Nb2 O5. Electrochemical analyses further reveal the diffusioncontrolled Li+intercalation kinetics and in-situ X-ray diffraction analysis indicates superior structural stability upon Li+intercalation/deintercalation. Benefiting from the intrinsic fast ion/electron transport, a high areal capacity of 2.24 m Ah cm^-2 is obtained even at an ultrahigh mass loading of 22.51 mg cm^-*** work can promote the development of Nb2 O5 materials for high areal capacity and stable lithium storage towards practical applications.

关键词： Niobium pentoxide Ion and electron transport Mass loading Areal capacity Lithium-ion battery

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Boosting the High Gas Sensing Performance Via Laser Embedding Schottky Heterointerfaces at Particle Boundaries in Sno2 Nanofibers

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SSRN 2023年

作者： Ma, Zhuangzhuang Zhang, Xiuhai Xiao, Changlin Gao, Xiaotong Wang, Hongqiang Jia, Lichao Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 620 West Chang’an Street Shaanxi Xi’an710119 China State Key Laboratory of Solidification Processing Center for Nano Energy Materials School of Materials Science and Engineering Northwestern Polytechnical University Shaanxi Joint Labortary of Graphene Xi’an710072 China

Metal oxide semiconductor-based gas sensors often require noble metals for modification to enhance the carrier mobility of the material. However, current noble metal modifications are almost always performed at the material surface, making it difficult to apply them to the particle boundaries (PBs) of the material, which can greatly reduce the utilization of noble metals. We herein synthesized Pt nanocrystals (NCs) with average size of 1 nm by the technology of pulsed laser irradiation, followed by in situ embedded at the PBs of SnO2 nanofibers to address the unwanted carrier loss at PBs for substantially improved gas sensing. The Pt NCs/SnO2 exhibited 2.23-fold enhancement of response values, and 2.86-fold improvement on selectivity for NO2 at 50oC, comparing to these samples without PBs engineering. Further analysis showed that the enhancement of the gas-sensitive performance is mainly due to the electronic and chemical sensitization of Pt NCs at the SnO2 PBs and the high utilization of Pt NCs leading to a significant increase in the carrier mobility of the material. We thus believe present work provides an efficient alternative for developing high performance gas sensing based on materials with intrinsic particle boundaries. © 2023, The Authors. All rights reserved.

关键词： Pulsed lasers

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Coupling Manipulation of Interfacial Chemistry and Coordination Structure in Vanadium Oxides Enables Rapid Magnesium Ion Diffusion Kinetics

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Angewandte Chemie 2024年第2期137卷

作者： Weixiao Wang Wenwen Wang Prof. Fangyu Xiong Jiashen Meng Jinsong Wu Wei Yang Juncai Long Jinghui Chen Jiajun Chen Prof. Qinyou An State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Materials Science and Engineering Chongqing University Chongqing 400030 China

Rechargeable magnesium batteries (RMBs) are a highly promising energy storage system due to their high volumetric capacity and intrinsic safety. However, the practical development of RMBs is hindered by the sluggish Mg 2+ diffusion kinetics, including at the cathode-electrolyte interface (CEI) and within the cathode bulk. Herein, we propose an efficient strategy to manipulate the interfacial chemistry and coordination structure in oligolayered V 2 O 5 (L−V 2 O 5 ) for achieving rapid Mg 2+ diffusion kinetics. In terms of the interfacial chemistry, the specific exposed crystal planes in L−V 2 O 5 possess strong electron donating ability, which helps to promote the degradation dynamics of C−F/C−S bonds in the electrolyte, thereby establishing the inorganic-organic interlocking CEI layer for rapid Mg 2+ diffusion. In terms of the coordination structure, the straightened V−O structure in L−V 2 O 5 provides efficient ions diffusion path for accelerating Mg 2+ diffusion in the cathode. As a result, the L−V 2 O 5 delivers a high reversible capacity (355.3 mA h g −1 at 0.1 A g −1 ) and an excellent rate capability (161 mAh g −1 at 1 A g −1 ). Impressively, the interdigital micro-RMBs is firstly assembled, exhibiting excellent flexibility and practicability. This work gives deeper insights into the interface and interior ions diffusion for developing high-kinetics RMBs.

关键词： Rechargeable magnesium batteries Interfacial chemistry Atomically thin vanadium oxide Interdigital microdevices

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