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Towards reliable assessment of hydrogen oxidation electrocatalysts for anion-exchange membrane fuel cells

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Nano Research 2023年第8期16卷 10787-10795页

作者： Fei-Yue Gao Ye-Hua Wang Yu Yang Jie Liao Jing-Wen DuanMu Xiao-Long Zhang Zhuang-Zhuang Niu Peng-Peng Yang Min-Rui Gao division of nanomaterials&chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Recent advancement of proton exchange membrane fuel cells has led to commercial sales of fuel-cell cars but market barrier exists because this technology heavily relies on platinum *** the permission of adopting platinum-group-metal-free catalysts,anion-exchange membrane fuel cell has received notable ***,the sluggish kinetics of anodic hydrogen oxidation reaction(HOR)largely limit the cell *** many high-performance HOR catalysts have been reported,there are analytical uncertainties in the literature concerning the assessment of the catalyst *** we determine the origin of false HOR currents in the recorded polarization curves and propose a rigorous approach to eliminate *** unveil experimentally the uncertainties of obtaining exchange current densities(j0)using Tafel plot from Bulter–Volmer equation and recommend employing the micro-polarization region *** bulky catalysts that cannot establish a well-defined diffusion layer,we suggest applying external stirring bar to offer certain level of enforced convection and using j0 to compare the activity.

关键词： platinum group metal-free catalysts anion-exchange membrane fuel cell hydrogen oxidation reaction kinetic analysis

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song Xie Zi-Meng Han Hao-Cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li Qing-Fang Guan Shu-Hong Yu department of chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

Wafer‑Scale Ag_(2)S‑Based Memristive Crossbar Arrays with Ultra‑Low Switching‑Energies Reaching Biological Synapses

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Nano-Micro Letters 2025年第3期17卷 328-339页

作者： Yuan Zhu Tomas Nyberg Leif Nyholm Daniel Primetzhofer Xun Shi Zhen Zhang division of Solid‑State Electronics Department of Electrical EngineeringUppsala University75121 UppsalaSweden department of chemistry Uppsala UniversityUppsalaSweden department of Physics and Astronomy Uppsala UniversityUppsalaSweden State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China

Memristive crossbar arrays(MCAs)offer parallel data storage and processing for energy-efficient neuromorphic ***,most wafer-scale MCAs that are compatible with complementary metal-oxide-semiconductor(CMOS)technology still suffer from substantially larger energy consumption than biological synapses,due to the slow kinetics of forming conductive paths inside the memristive *** we report wafer-scale Ag_(2)S-based MCAs realized using CMOS-compatible processes at temperatures below 160℃.Ag_(2)S electrolytes supply highly mobile Ag+ions,and provide the Ag/Ag_(2)S interface with low silver nucleation barrier to form silver filaments at low energy *** further enhancing Ag+migration in Ag_(2)S electrolytes via microstructure modulation,the integrated memristors exhibit a record low threshold of approximately−0.1 V,and demonstrate ultra-low switching-energies reaching femtojoule values as observed in biological *** low-temperature process also enables MCA integration on polyimide substrates for applications in flexible ***,the intrinsic nonidealities of the memristive units for deep learning can be compensated by employing an advanced training *** impressive accuracy of 92.6%in image recognition simulations is demonstrated with the MCAs after the *** demonstrated MCAs provide a promising device option for neuromorphic computing with ultra-high energy-efficiency.

关键词： Wafer-scale Ag_(2)S films Reactive sputter Silver nucleation Ag^(+)migration Energy-efficient neuromorphic computing

A superspreading layering process enabled high performance layered nanocomposites

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Science China chemistry 2020年第7期63卷 873-874页

作者： Qing-Fang Guan Shu-Hong Yu division of nanomaterials&chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Biomaterials like nacre, bones and mollusk shells provide a rich source of inspiration for developing mechanically strong and tough composites. They have stimulated great research interest to explore various methods to prepare artificially synthetic composites with desired strength and toughness for practical applications. In addition to mineralization [1], a number of approaches, such as vacuum filtration.

关键词： composites tough shells

Subnanometer nanowires as gelators for volatile organic liquids

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Science China chemistry 2022年第10期65卷 1839-1840页

作者： Shu-Hong Yu department of chemistry Institute of Biomimetic Materials&ChemistryDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

Organic solvents are widely used in our daily life and industry,such as organic fuels and organic synthetic raw ***,compared with water,the intermolecular force between some organic solvent molecules is weaker,with lower melting point and being more difficult to *** properties lead to potential risks in safe storage and transportation,and meanwhile limit the development of new functional gel ***,the supramolecular system to trap volatile organic molecules has been developed[1‒3],but there is a big gap between the supramolecularorganogel and the hydrogel in the efficiency of molecularlimit and the mechanical properties.

关键词： materials properties volatile

Revealing the effect of OH-concentration change on the formation of FeNi layered double hydroxides

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Science China Materials 2023年第7期66卷 2949-2950页

作者： Zi-Meng Han Shu-Hong Yu department of chemistry Institute of Biomimetic Materials&ChemistryDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

Benefiting from unique physicochemical properties,layered double hydroxides(LDHs)are attracting intense interest in a wide range of applications[1,2].The research community has been dedicated to synthesizing LDHs mainly via various wet chemical strategies including hydrothermal/solvothermal methods[3],co-precipitation[4],electrodeposition[5].

关键词： hydroxide layered double

Magnetic Field-Induced Solvothermal Synthesis of One-Dimensional Assemblies of Ni Co Alloy Microstructures

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Nano Research 2008年第4期1卷 303-313页

作者： Ming Jun Hu Bin Lin Shu Hong Yu division of nanomaterials&chemistry Hefei National Laboratory for Physical Sciences at MicroscaleSchool of Chemistry and MaterialsUniversity of Science and Technology of ChinaHefei 230026China

One-dimensional magnetic Ni Co alloy microwires with different microstructures and differently shaped building blocks including spherical particles,multilayer stacked alloy plates,and alloy flowers,have been synthesized by an external magnetic field-assisted solvothermal reaction of mixtures of cobalt(II)chloride and nickel(II)chloride in 1,2-propanediol with different NaOH *** adjusting the experimental parameters,such as precursor concentration and Ni/Co ratio,Ni Co alloy chains with uniform diameters in the range 500 nm to 1.3μm and lengths ranging from several micrometers to hundreds of micrometers can be obtained.A mechanism of formation of the one-dimensional assemblies of magnetic NiCo microparticles in a weak external magnetic fi eld is proposed.

关键词： Ni Co alloy microstructures magnetic fi eld-induced assembly solvothermal synthesis

Highly stretchable,soft and sticky PDMS elastomer by solvothermal polymerization process

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Nano Research 2021年第10期14卷 3636-3642页

作者： Jin Huang Yuchun Cai Chengyuan Xue Jin Ge Haoyu Zhao Shu-Hong Yu division of nanomaterials&chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleInstitute of EnergyHefei Comprehensive National Science CenterCAS Center for Excellence in NanoscienceDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Siloxane rubber shows attractive properties of high stability,elasticity and ***,the regulation of its properties renders it widely used in many application ***,most of the reported performance improvement methods of siloxane rubber focus on the change of chemical composition of siloxane rubber,including the design of molecular chain and the introduction of other compounds,*** a strategy is still faced with many limitations in practical *** this work,on the premise of not changing the chemical composition of siloxane rubber,we propose a facile solvothermal polymerization process to change the structure of cross-linking networks,so as to obtain the siloxane rubber with controllable mechanical *** to the normal curing method,we realized polydimethylsiloxane elastomer(PDMS)with maximum elongation of more than 3,000%(>10 times of normally cured one)and tensile modulus lower than 0.15 MPa(<1/10 of normally cured one).In addition to superior stretchability,it gains extra high softness,stickiness and sensitive response to organic *** on our solvothermal cured PDMS,its applications in oil collection and organic solvent sensor have been *** is expected that this method can be readily utilized widely and shows great application potentials.

关键词： polydimethylsiloxane elastomer(PDMS)property modification solvothermal polymerization controllable cross-linking networks organic solvent sensor

Printable elastic silver nanowire-based conductor for washable electronic textiles

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Nano Research 2020年第10期13卷 2879-2884页

作者： Hong-Wu Zhu Huai-Ling Gao Hao-Yu Zhao Jin Ge Bi-Cheng Hu Jin Huang Shu-Hong Yu division of nanomaterials&chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleInstitute of EnergyHefei Comprehensive National Science CenterCAS Center for Exclilence in NanoscienceDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Printable elastic conductors promote the wide application of consumable electronic textiles (e-textiles) for pervasive healthcare monitoring and wearable computation. To assure a clean appearance, the e-textiles require a washing process to clean up the dirt after daily use. Thus, it is crucial to develop low-cost printable elastic conductors with strong adhesion to the textiles. Here, we report a composite elastic conductor based on Ag nanowires (NWs) and polyurethane elastomer. The composite could be dispersed into ink and easily printed onto textiles. One-step print could form robust conductive coatings without sealing on the textiles. Interestingly, the regional concentration of Ag NWs within the polyurethane matrix was observed during phase inversion, endowing the elastic conductor with a low percolation threshold of 0.12 vol.% and high conductivity of 3,668 S·cm^−1. Thanks to the high adhesion of the elastic conductors, the resulted e-textiles could withstand repeated stretching, folding, and machine washing (20 times) without obvious performance decay, which reveals its potential application in consumable e-textiles.

关键词： printable elastic conductor electronic textiles washability phase inversion silver nanowires