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A portable and washable solar steam evaporator based on graphene and recycled gold for efficient point-of-use water purification

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science China materials 2024年第11期67卷 3700-3709页

作者： Fei Li Jiongpeng Huang Dingxin Xu Chengjin Wang Liang Zhao Xinyu Gong Hang Li Can Yang Zhang Qinghua Song Yang Su Hui-Ming Cheng Tsinghua-Berkeley Shenzhen Institute&Institute of Materials Research&Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518107China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

A solar steam evaporator provides a sustainable and efficient alternative water purification solution to address the global freshwater *** efforts have made significant advances in maximizing its water evaporation rate,but no single evaporator has all the properties necessary for practical point-of-use application,including a high efficiency for generation of drinkable water,an excellent portability critical for on-site water purification,good washability for mitigating evaporator fouling,and good *** report a strategy to produce a high-performance photothermal material for point-of-use water *** simultaneously incorporating graphene and gold particles grown from recycled electronic waste in a mechanically strong sponge,we achieved highly efficient water purification under realistic *** addition to a high evaporation rate(3.55 kg/m^(2)/h under one-sun irradiation)attributed to a control of atomic structure of graphene and the size-dependent surface plasmon resonance of gold nanoparticles,it is portable which can be folded,vacuum compacted,dried and rehydrated without compromising *** also allows repeated washing to remove contaminant fouling so that it can be *** evaporator transforms various types of contaminated water into drinkable clean water,and can be mounted at any angle to optimize the incident solar ***,the assembled steam evaporator device could gain purified water meeting the World Health Organization drinking water standards with a high evaporation rate of 9.36 kg/m^(2)/h under outdoor sunlight.

关键词： graphene gold resources recovery and reuse solar steam evaporator sustainable development

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ENHANCING DUCTILITY OF MARTENSITIC STEELS THROUGH CRYOGENIC TREATMENT 1

ENHANCING DUCTILITY OF MARTENSITIC STEELS THROUGH CRYOGENIC ...

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1st International Conference on Mechanical System Dynamics, ICMSD 2022

作者： Xu, Chi Dai, Wenjie Chen, Yang Zheng, Gong Qi, Zhixiang Chen, Guang MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology Nanjing China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

Reversed austenite is effective in enhancing ductility and toughness of low carbon martensitic steels. Despite much research into acquiring reversed austenite through inter-critical tempering, there remains little knowledge of the effect of an additional cryogenic treatment before tempering on the formation of reversed austenite and mechanical properties. The present study investigated the comparison between a cast 0.13C-11Cr-5Ni-5Mo (wt. %) steel under direct quench-temper treatment and that with an additional cryogenic treatment. Results show that cryogenic treatment causes the formation of fine M23C6 carbides which act as nucleation sites for reversed austenite. The amount of reversed austenite is substantially increased after tempering at around 600 ℃. Moreover, the reversed austenite turns out to be thin strips instead of commonly observed coarse blocks. As a result, cryogenic treatment improves ductility and strain hardening ability without sacrifice in strength. Our results enhance the understanding of reversed austenite formation under the influence of cryogenic treatment, and provide a guide for the design of heat treatment procedures of low carbon martensitic steels. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Cryogenics

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Liquid Metal Enabled Conductive Zwitterionic Hydrogel for Robust Electrochemical Sensing in Complex Serum

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SSRN 2024年

作者： Ma, Jiao Li, Shikang Li, Xiaoting Wang, Hua Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Shanxi Taiyuan030024 China North Automatic Control Technology Institute Shanxi Taiyuan030006 China

Any materials present in complex samples that bind the sensing interface non-specifically will greatly decrease the sensitivity and accuracy of the electrochemical sensor. Zwitterionic hydrogel have exhibited extraordinary antifouling ability, but they are limited by the electrical insulativity and weak interface, resulting in a double-edged strategy. Herein, we proposed a novel approach to resolve this challenge thanks to the liquid metal (LM). It was found that with only ultrasonic treatment, a core-shell nanostructure could be easily formed between LM matrix and sodium alginate (SA) polymer, accompanied with the generation of lots of free radical, which initiated the polymerization of zwitterionic monomer and further crosslinking with methylacrylated bovine serum albumin. The whole process involved no synthesis of conductive nanomaterials or addition of initiators. More remarkably, the acquired superhydrophilic hydrogel exhibited a surprisingly favourable adhesion to the electrode surface, attributed to the carboxyl groups and related denser gel network resulting from the LM@SA nanoparticles. Finally, the prepared electrochemical immunosensor possessed excellent repeatability, storage stability, selectivity and meanwhile a wide linear range from 10 pg mL-1 - 100 ng mL-1, and an ultralow detection limit of 8.23 pg mL-1 for the detection of motilin even in 100% human serum. Moreover, this is a successful attempt of LM-based nanocomposite hydrogel as an electrochemical sensing matrix, and we believe it could present further opportunities toward more satisfying sensing interface for biosensing and bioelectronics with more research in future. © 2024, The Authors. All rights reserved.

关键词： Hydrogels

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Design of Quaternary Fesiconi Soft Magnetic Composites for Large-Power and High-Frequency Applications

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SSRN 2024年

作者： Chen, Qiming Wu, Chen Yan, Mi School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310058 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030032 China

The growing trend of large power and high frequency in electromagnetic conversion applications urges advancements in the saturation magnetization (Ms), effective permeability (μe) and core loss (Pcv) of soft magnetic composites (SMCs). Such performance depends largely on the Ms and coercivity (Hc) of the magnetic alloys as the main component of the SMCs. It is however, difficult to simultaneously achieve large Ms and low Hc via binary and ternary alloy systems. Here, quaternary Fe81-xSi15Co4Nix (x = 0, 3, 6 at%) soft magnetic alloys have been designed with the effect of Ni addition on the microstructure and magnetic properties of the alloy revealed. On one hand, rational incorporation of Co and Ni maintains the relatively large Ms. On the other hand, the Ni enters into the A2 lattice and promotes its transition into DO3 ordered phase as confirmed by both experimental characterization and first-principles calculations. Such microstructural evolution gives rise to initially decreased magnetocrystalline anisotropy (K1) followed by increasing due to the competitive reduction effect of Ni addition and increment effect of DO3 formation. The magnetostriction constants (λs) increases monotonously from negative to positive values with raised Ni content. The reduced λs with appropriate Ni incorporation facilitate the formation of 180° domain wall structure as revealed by Lorentz microscopy. Combined lowest K1 and λs as well as optimized domain structure result in the lowest Hc for the Fe78Si15Co4Ni3 alloy. The corresponding SMCs exhibit excellent performance with the μe of 160.6 and the Pcv of 288.4 mW/cm3 (50 mT, 100 kHz) combined with high Ms of 177.3 emu/g, superior to other FeSi-based SMCs. © 2024, The Authors. All rights reserved.

关键词： Magnetic properties

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Ultra-small platinum nanoparticles segregated by nickle sites for efficient ORR and HER processes

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Journal of Energy Chemistry 2022年第2期31卷 48-54页

作者： Lvhan Liang Huihui jin Huang Zhou Bingshuai Liu Chenxi Hu Ding Chen Jiawei Zhu Zhe Wang Hai-Wen Li Suli Liu Daping He Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryXianhu Hydrogen ValleyFoshan 528200GuangdongChina Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070HubeiChina Platform of Inter/Transdisciplinary Energy Research International Research Center for Hydrogen EnergyInternational Institute for Carbon-Neutral Energy ResearchYushu UniversityFukuoka 819-0395Japan Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171JiangsuChina

In the electrochemical process,Pt nanoparticles(NPs)in Pt-based catalysts usually agglomerate due to Oswald ripening or lack of restraint,ultimately resulting in reduction of the active sites and catalytic *** to uniformly disperse and firmly fix Pt NPs on carbon matrix with suitable particle size for catalysis is still a big ***,to prevent the agglomeration and shedding of Pt NPs,Ni species is introduced and are evenly dispersed in the surface of carbon matrix in the form of Ni-N-C active sites(Ni ZIF-NC).The Ni sites can be used to anchor Pt NPs,and then effectively limit the further growth and agglomeration of Pt NPs during the reaction *** with commercial Pt/C catalyst,Pt@Ni ZIF-NC,with ultralow Pt loading(7 wt%)and ideal particle size(2.3 nm),not only increases the active center,but also promotes the catalysis kinetics,greatly improving the ORR and HER catalytic *** acidic conditions,its half-wave potential(0.902 V)is superior to commercial Pt/C(0.861 V),and the mass activity(0.38 A per mg Pt)at 0.9 V is 4.7 times that of Pt/C(0.08 A per mg Pt).Besides,it also shows outstanding HER *** 20 and 30 mV,its mass activity is even 2 and 6 times that of Pt/C,*** it is under ORR or HER conditions,it still shows excellent *** undoubtedly indicate the realization of dual-functional catalysts with low-Pt and high-efficiency properties.

关键词： Oxygen reduction reaction Hydrogen evolution reaction Zeolitic imidazolate frameworks Nickle site Pt nanoparticles

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First-Principles Calculations On the Structural, Elastic and Electronic Properties of Different Structural TiN

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SSRN 2025年

作者： Li, Cheng Ma, Lishi Liu, Liang Yi, Jianhong Li, Caiju Kong, Xin Chen, Xiaofeng Xu, Zunyan Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China Key Laboratory of Advanced Materials of Yunnan Province Kunming650093 China Faculty of Material Science and Engineering Yunnan Key Laboratory of Integrated Computational Materials Engineering for Advanced Light Alloys Kunming University of Science and Technology Kunming650093 China Yunnan Engineering Research Center of Metallic Powder Materials Kunming University of Science and Technology Kunming650093 China

The phase stability, elastic properties, tensile strength, electronic properties, and thermal properties of TiN nitride with different structures were investigated based on the first-principles calculation. Formation enthalpy was performed to evaluate the phase stability of TiN, which showed that TiN exhibits energy stability, with the order of phase stability as follows: B1 > B2 > B3. Systematic studies of the elastic properties of TiN reveal that TiN nitrides are anisotropic, with the B3 phase having the highest ideal tensile strength in the [010] direction. Additionally, considering the Cauchy pressure (PC), Poisson's ratio (ν) and GH/BH, the B1 phase is identified as brittle while the others are ductile. The minimum thermal conductivity calculated from the Clarke and Cahill models shows an anisotropy of the order B3 > B2 > B1. © 2025, The Authors. All rights reserved.

关键词： Poisson ratio

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Electrolyte inhomogeneity induced lithium plating in fast charging lithium-ion batteries

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Journal of Energy Chemistry 2022年第10期31卷 394-399,I0010页

作者： Yi Yang Lei Xu Shi-Jie Yang Chong Yan Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032ShanxiChina

Fast charging capability of lithium-ion batteries is in urgent need for widespread economic success of electric vehicles. However, the application of the fast charging technology often leads to the inevitable lithium plating on the graphite anode, which is one of the main culprits that endanger battery safety and shorten battery lifespan. The in-depth understanding of the initiation of lithium metal nucleation and the following plating behavior is a key to the development of fast charging cells. Herein, we investigate the overlooked effect of the non-uniform distribution of electrolyte on lithium plating during fast charging. Prior lithium plating occurs on the saturated lithium-graphite compounds in the anode region with sufficient electrolyte since the lithium-ion transport is blocked in the anode region lacking electrolyte. The uniform distribution of electrolyte is crucial for the construction of safe lithium-ion batteries especially in fast charging scenarios.

关键词： Fast charging Lithium-ion batteries Lithium plating Distribution of electrolyte Inhomogeneity

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Dual-ligand and hard-soft-acid-base strategies to optimize metal-organic framework nanocrystals for stable electrochemical cycling performance

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National science Review 2022年第7期9卷 88-96页

作者： Shasha Zheng Yan Sun Huaiguo Xue Pierre Braunstein Wei Huang Huan Pang School of Chemistry and Chemical Engineering Yangzhou University Institut de Chimie UMR 7177 Universite′ de StrasbourgCNRS State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLo FE)Northwestern Polytechnical University

Most metal-organic frameworks（MOFs） hardly maintain their physical and chemical properties after exposure to acidic,neutral,or alkaline aqueous solutions,resulting in insufficient stability,therefore limiting their ***,the design and synthesis of stable size/morphology-controlled MOF nanocrystals is critical but *** this study,dual-ligand and hard-soft-acid-base strategies were used to fabricate a variety of 3D pillared-layer [Ni（thiophene-2,5-dicarboxylate）(4,4'-bipyridine)]_n MOF nanocrystals（1D nanofibers,2D nanosheets and 3D aggregates） with controllable morphology by varying the concentration of 4,4'-bipyridine and thus controlling the crystal growth *** to the shorter ion diffusion length,enhanced ele ctron/ion transfer and strong interactions between thiophene-2,5-dicarboxylate and4,4'-bipyridine,the 2D nanosheets showed much larger specific capacitance than 1D nanofibers and 3D aggregates.A single device with an output voltage as high as 3.0 V and exceptional cycling performance(95% of retention after 5000 cycles at 3 mA cm-2) was realized by configuring two aqueous asymmetric super capacitive devices in *** excellent cycling property and charge-discharge mechanism are consistent with the hard-soft-acid-base theory.

关键词： metal-organic framework dual ligand hard-soft-acid-base electrochemical energy storage supercapacitor

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Grain refinement, twin formation and mechanical properties of magnesium welds with addition of CNTs and TiC particles

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Journal of Magnesium and Alloys 2024年

作者： Gao, Yongkang Xu, Lianyong Hao, Kangda Han, Yongdian Zhao, Lei Ren, Wenjing School of Materials Science and Engineering Tianjin University Tianjin300350 China Tianjin Key Laboratory of Advanced Joining Technology Tianjin300350 China

In this work, microstructure and mechanical properties of Mg weld with addition of carbon nanotubes (CNTs) and TiC particles were investigated. The results showed that the weld microstructure was mainly presented as equiaxed grains with almost high angle grain boundaries. The introduction of reinforcements promoted the formation of precipitates and refined the grains effectively, the average grain size was refined by 51 % and 23 % with addition of CNTs and TiC particles, respectively. The dislocation density and the fraction of CSL boundaries were increased with addition of CNTs, while those were decreased with addition of TiC particles. Besides, the infrequent {101¯3} contraction twins formed within the weld due to the stress concentration caused by dislocation accumulation, which contributed to the Σ29 CSL boundary. The ultimate tensile strength and elongation rate were increased by 13.5 % and 40 % with addition of CNTs, while the ultimate tensile strength and micro-hardness were increased by 14.8 % and 20.9 % with addition of TiC particles. © 2024

关键词： Tensile strength

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Enhanced thermoelectric performance of n-type Bi_(2)Te_(2.7)Se_(0.3) via a simple liquid-assisted shear exfoliation

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Journal of materials science & Technology 2022年第22期117卷 251-258页

作者： Yifeng Wang Yilin Song Kaikai Song Lin Pan Changchun Chen Kunihito Koumoto Qingfeng Liu College of Materials Science and Engineering Nanjing Tech UniversityNanjing 210009China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 210009China Nagoya Industrial Science Research Institute Nagoya 464-0819Japan Center of Nanotechnology King Abdulaziz UniversityJeddah 21589Saudi Arabia State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

A liquid-assisted shear exfoliation (LASE) as a new powder metallurgy method coupled with spark plasmasintering (SPS) was applied for n-type Bi_(2)Te_(2.7)Se_(0.3) and the effects on microstructure and anisotropictransport properties were investigated. Results revealed an effective reduction of average grain size dueto LASE and a high texturing in the bulks. Moreover, along the in-plane direction, electrical conductivitywas increased noticeably due to an enhanced carrier concentration, leading to a significantly improvedpower factor of 25 μW cm^(–1) K^(–2) at 303 K. Meanwhile, the total thermal conductivity was reduced effectively owing to reduction both in lattice component due to enhanced phonon scattering with the grainsize reduction, and in the bipolar component inhibited by the increased carrier concentration. Ultimately,a peak thermoelectric figure of merit (ZT) value of 0.83 was obtained at 448 K along the in-plane direction, increased by 95% compared with the pristine one. These results demonstrate the LASE process as auseful assistant method for enhancing the TE performance of layered materials.

关键词： Bi_(2)Te_(2.7)Se^(0.3) Liquid-assisted shear exfoliation Textured microstructure Thermoelectric

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