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Enhancing mechanical and anti-corrosion properties of waterborne epoxy coatings with (+)-catechin and tea polyphenol copolymerized nanosheets

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Corrosion Science 2025年

作者： Song Zhang Pei Zhou Yun Li Yujie Qiang Zhenzhen Feng Jian Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China National Center for Materials Service Safety University of Science and Technology Beijing Beijing 100083 China

Mild steels are essential in marine engineering, but their susceptibility to electrochemical corrosion in high-salt, high-humidity environments poses significant challenges. With the functional fillers addressing hydrophilic nature and enhancing barrier integrity, waterborne epoxy (WEP) coatings have emerged as a promising solution. Tea polyphenols (TPs) and (+)-catechins as bio-derived fillers offer unique advantages, including antioxidative properties, excellent compatibility with epoxy resins, and alignment with circular economy principles. However, their particulate monomers fail to establish durable barriers due to discontinuous passivation layers and weak resin interactions. Herein, we design two-dimensional copolymerized nanosheets (CTPNS) derived from TPs and (+)-catechins via Mn(II)-catalyzed oxidative polymerization to optimize their application capability. The optimized CTPNS 0.5 /WEP composite coating demonstrated exceptional anti-corrosion performance, retaining a low-frequency impedance modulus of 2.25×10 10 Ω·cm 2 after 70 days of immersion in NaCl solution, which is four orders of magnitude higher than pure WEP. Remarkably, mechanical performances are simultaneously elevated, outperforming conventional biocomposites. Mechanistic studies reveal a dual protection mechanism: CTPNS forms self-passivating Fe-O coordination layers on substrates, while its aligned nanosheet structure prolongs the diffusion pathways of corrosive species, collectively ensuring durable barrier performance. By pioneering bio-derived 2D nanosheets as dual-functional additives, this work establishes an eco-conscious paradigm for anti-corrosion coatings, paving the way for the use of renewable biomaterials in anti-corrosion technologies.

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Single-Atom Catalysts for Electrochemical Hydrogen Evolution Reaction: Recent Advances and Future Perspectives

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Nano-Micro Letters 2020年第2期12卷 73-101页

作者： Zonghua Pu Ibrahim Saana Amiinu Ruilin Cheng Pengyan Wang Chengtian Zhang Shichun Mu Weiyue Zhao Fengmei Su Gaixia Zhang Shijun Liao Shuhui Sun Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications VarennesQC J3X 1S2Canada State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China The Key Laboratory of Fuel Cell Technology of Guangdong Province The Key Laboratory of New Energy Technology of Guangdong UniversitiesSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641People’s Republic of China Key Laboratory of Materials Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002People’s Republic of China

Hydrogen,a renewable and outstanding energy carrier with zero carbon dioxide emission,is regarded as the best alternative to fossil *** most preferred route to large-scale production of hydrogen is by water electrolysis from the intermittent sources(e.g.,wind,solar,hydro,and tidal energy).However,the efficiency of water electrolysis is very much dependent on the activity of ***,designing high-effective,stable,and cheap materials for hydrogen evolution reaction(HER)could have a substantial impact on renewable energy ***,single-atom catalysts(SACs)have emerged as a new frontier in catalysis science,because SACs have maximum atom-utilization efficiency and excellent catalytic reaction *** synthesis methods and analytical techniques have been adopted to prepare and characterize these *** this review,we discuss recent progress on SACs synthesis,characterization methods,and their catalytic ***,we highlight their unique electrochemical characteristics toward ***,the current key challenges in SACs for HER are pointed out and some potential directions are proposed as well.

关键词： Single-atom catalysts Nanomaterials Electrocatalyst Hydrogen evolution reaction Electrochemical energy conversion

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Electrically controlled nonvolatile switching of single-atom magnetism in a Dy@C84 single-molecule transistor

arXiv

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arXiv 2024年

作者： Wang, Feng Shen, Wangqiang Shui, Yuan Chen, Jun Wang, Huaiqiang Wang, Rui Qin, Yuyuan Wang, Xuefeng Wan, Jianguo Zhang, Minhao Lu, Xing Yang, Tao Song, Fengqi National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing210093 China Institute of Atom Manufacturing Nanjing University Suzhou215163 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering Hefei University of Technology Hefei230009 China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi'an Jiaotong University Xi’an710049 China Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210023 China

Single-atom magnetism switching is a key technique towards the ultimate data storage density of computer hard disks and has been conceptually realized by leveraging the spin bistability of a magnetic atom under a scanning tunnelling microscope. However, it has rarely been applied to solid-state transistors, an advancement that would be highly desirable for enabling various applications. Here, we demonstrate realization of the electrically controlled Zeeman effect in Dy@C84 single-molecule transistors, thus revealing a transition in the magnetic moment from 3.8 μB to 5.1 μB for the ground-state GN at an electric field strength of 3 − 10 MV/cm. The consequent magnetoresistance significantly increases from 600% to 1100% at the resonant tunneling point. Density functional theory calculations further corroborate our realization of nonvolatile switching of single-atom magnetism, and the switching stability emanates from an energy barrier of 92 meV for atomic relaxation. These results highlight the potential of using endohedral metallofullerenes for high-temperature, high-stability, high-speed, and compact single-atom magnetic data storage. © 2024, CC BY.

关键词： Magnetic storage

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Review on DFT calculation of s-triazine-based carbon nitride

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Carbon Energy 2019年第1期1卷 32-56页

作者： Bicheng Zhu Bei Cheng Liuyang Zhang Jiaguo Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina

To improve the photocatalytic performance of pristine photocatalysts,element doping,construction of composites and fabrication of novel nanostructures are recognized as universal modification *** methods have been experimentally verified to be effective in manifold photocatalytic application over various *** functional theory(DFT)calculation is a powerful and fundamental tool to pinpoint the intrinsic mechanism of the enhanced photocatalytic *** it holds the degree of precision ranging from atoms,molecules to unit ***,recent DFT calculation research progress of modified s-triazine-based graphitic carbon nitride(g-C3N4)systems as photocatalysts is *** specify,we collected information of doping site,formation energy,geometric,and electronic *** also discussed the synergistic effect of work function,Fermi level and band edge position on the built-in electric field,transfer route of photogenerated charge carriers and photocatalytic mechanism(traditional typeⅡor direct Z-scheme heterostructure).Moreover,we analyzed the geometric configuration,band structure,and stability of g-C3N4 nanocluster,nanoribbon,and ***,future perspective in the further theoretical revelation of g-C3N4-based photocatalysts is proposed.

关键词： charge transfer density functional theory electronic property g-C3N4 photocatalysis

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Post-annealing tailored 3D cross-linked TiNb2O7 nanorod electrode: towards superior lithium storage for flexible lithium-ion capacitors

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Science China materials 2020年第4期63卷 492-504页

作者： Bohua Deng Haoyang Dong Tianyu Lei Ning Yue Liang Xiao Jinping Liu School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

TiNb2O7 anode materials(TNO)have unique potential for applications in Li-ion capacitors(LICs)due to their high specific capacity of ca.280 mA h g^-1 over a wide anodic Li-insertion potential ***,their highrate capability is limited by their poor electronic and ionic *** particular,studies on TNO for LICs are lacking and that for flexible LICs have not yet been ***,a unique TNO porous electrode with cross-linked nanorods tailored by post-annealing and its application in flexible LICs are *** binder-free TNO anode exhibits superior rate performance(~66.3%capacity retention as the rate increases from 1 to 40 C),which is ascribed to the greatly shortened ion-diffusion length in TNO nanorods,facile electrolyte penetration and fast electron transport along the continuous single-crystalline nanorod ***,the TNO anode shows an excellent cycling stability up to 2000 cycles and good flexibility(no capacity loss after continuous bending for 500 times).Model flexible LIC assembled with the TNO anode and activated carbon cathode exhibits increased gravimetric and volumetric energy/power densities(~100.6 W h kg^-1/4108.8 W kg^-1;10.7 mW h cm^-3/419.3 mW cm^-3),more superior to previously reported hybrid *** device also efficiently powers an LED light upon 180°bending.

关键词： post-annealing cross-linked nanorods facile electron transport superior rate performance flexible Li-ion capacitors

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Eutectic Monbta(Wc)X Composites with Excellent Elevated Temperature Strength

SSRN

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SSRN 2022年

作者： Kang, Kejia Wang, Xiao Zhou, Weibing Li, Peibo Huang, Zihao Luo, Guoqiang Shen, Qiang Zhang, Lianmeng School of Electromechanical Engineering Henan University of Technology Zhengzhou450001 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Hanjiang Laboratory Chaozhou521000 China State Key Lab of Silicate Materials for Architecture Wuhan University of Technology Wuhan430070 China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and Technology Luoyang471000 China

To develop materials with promising utilization future in the extreme environments of aerospace, the MoNbTa(WC) x composites were prepared by vacuum arc melting, of which the crystal structure, microstructure, and compression properties at elevated temperature were investigated. The MoNbTa(WC) x composites had eutectic structures that consisted of body-centered cubic (BCC) phase and eutectoid structures. The lamellar fine eutectoid structures were composed of BCC structured high entropy alloy (HEA) Mo-Nb-Ta-W and FCC structured carbide Mo-Nb-Ta-W-C. It was demonstrated that the ductility and elevated temperature strength was enhanced simultaneously combined with the effect of eutectic structures and WC addition. The optimal true yield strength and true fracture strain reached 1205 MPa and 29.2% in MoNbTa(WC) 0.9 at 1200 ℃, meanwhile, the fracture strain at ambient temperature was 13.96%. Distinct strain hardening was observed at the initial deformation stage of MoNbTa(WC) 0.9 at 1200 ℃. The compression performances of MoNbTa(WC) x were superior in comparison with most refractory high entropy alloys. © 2022, The Authors. All rights reserved.

关键词： Eutectics

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One-Pot K+ and Po43- Co-Doping Enhances Electrochemical Performance of Li-Rich Li1.2ni0.13co0.13mn0.54o2 Cathode for Li-Ion Battery

SSRN

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SSRN 2022年

作者： Peng, Yan Wu, Liang Li, Chao-Fan Luo, Bi-Cheng Hu, Zhi-Yi Li, Yu Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China University of Namur 61 Rue de Bruxelles NamurB-5000 Belgium

The high specific capacity of Li-rich Mn-based oxides make them promising cathodes for high-energy-density lithium-ion batteries (LIBs). However, the problems such as low initial coulombic efficiency, fast capacity and voltage fading, poor kinetics, large voltage hysteresis, and poor safety hamper their fast commercialization. Herein, we report one-pot K + and PO 4 3- co-doping Li-rich Mn-based oxides Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode material to improve the electrochemical performance for LIBs. On the one hand, K + doping can stabilize the bulk structure and enlarge the Li slabs to facilitate the diffusion of Li + , resulting in enhanced cycling and rate performance. On the other hand, PO 4 3- doping changes the electronic structure of the material and weakens the covalency of TM-O, decreasing the irreversible loss of lattice oxygen and stabilizing the structure. As a result, the K + and PO 4 3- co-doping can effectively alleviate the capacity and voltage decay and the modified sample shows better cycling stability (88.6%@0.5 C@250 cycles) and rate performance (155.5 mAh g −1 @5 C) compared to the pristine material. Our strategy here provides a facile one-pot method to modifying Li-rich cathode material for high-performance LIBs. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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TiN Paper for Ultrafast-Charging Supercapacitors

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Nano-Micro Letters 2020年第1期12卷 27-39页

作者： Bin Yao Mingyang Li Jing Zhang Lei Zhang Yu Song Wang Xiao Andrea Cruz Yexiang Tong Yat Li Department of Chemistry and Biochemistry University of CaliforniaSanta CruzSanta CruzCA 95064USA KLGHEI of Environment and Energy Chemistry MOE of the Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-Sen UniversityGuangzhou 510275People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ultrafast-charging energy storage devices are attractive for powering personal electronics and electric *** ultrafast-charging devices are made of carbonaceous materials such as chemically converted graphene and carbon ***,their relatively low electrical conductivity may restrict their performance at ultrahigh charging ***,we report the fabrication of a porous titanium nitride(TiN)paper as an alternative electrode material for ultrafast-charging *** TiN paper shows an excellent conductivity of 3.67×104 S m−1,which is considerably higher than most carbon-based *** paper-like structure also contains a combination of large pores between interconnected nanobelts and mesopores within the *** unique electrode enables fast charging by simultaneously providing efficient ion diffusion and electron *** supercapacitors(SCs)made of TiN paper enable charging/discharging at an ultrahigh scan rate of 100 V s−1 in a wide voltage window of 1.5 V in Na2SO4 neutral *** has an outstanding response time with a characteristic time constant of 4 ***,the TiN paper-based SCs also show zero capacitance loss after 200,000 cycles,which is much better than the stability performance reported for other metal nitride ***,the device shows great promise in *** filtration method enables good control of the thickness and mass loading of TiN electrodes and devices.

关键词： Ultrafast charging Wide voltage window TiN Paper-like electrode Supercapacitors

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Intrinsic mechanical behavior of MgAgSb thermoelectric material:An ab initio study

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Journal of Materiomics 2020年第1期6卷 24-32页

作者： Guodong Li Qi An Umut Aydemir Sergey I.Morozov Bo Duan Pengcheng Zhai Qingjie Zhang William A.Goddard Ⅲ Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Chemical and Materials Engineering University of Nevada RenoRenoNV89557USA Department of Chemistry Koc UniversitySariyerIstanbul34450Turkey Boron and Advanced Materials Research Center Koc UniversitySariyerIstanbul34450Turkey Department of Computer Simulation and Nanotechnology South Ural State UniversityChelyabinsk454080Russia Materials and Process Simulation Center California Institute of TechnologyPasadenaCA91125USA

α-MgAgSb based thermoelectric(TE)device attracts much attention for its commercial application because it shows an extremely high conversion efficiency of ~8.5% under a temperature difference of 225 ***,the mechanical behavior of α-MgAgSb is another serious consideration for its engineering ***,we apply density functional theory(DFT)simulations to examine the intrinsic mechanical properties of all three MgAgSb phases,including elastic properties,shear-stress-shear-strain relationships,deformation and failure mechanism under ideal shear and biaxial shear *** find that the ideal shear strength of α-MgAgSb is 3.25 GPa along the most plausible(100)<010>slip *** strength is higher than that of β-MgAgSb(0.80 GPa)and lower than that of γ-MgAgSb(3.43 GPa).The failure of α-MgAgSb arises from the stretching and breakage of MgeSb bond α-MgAgSb under pure shear load,while it arises from the softening of MgeAg bond and the breakage of AgeSb bond under biaxial shear *** suggests that the deformation mechanism changes significantly under different loading conditions.

关键词： MgAgSb thermoelectric materials Density functional theory Ideal strength Deformation mechanism

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Sisyphus effects in hydrogen electrochemistry on metal silicides enabled by silicene subunit edge

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Science Bulletin 2019年第9期64卷 617-624页

作者： Zechao Zhuang Yong Li Jiazhao Huang Zilan Li Kangning Zhao Yunlong Zhao Lin Xu Liang Zhou Lyudmila V. Moskaleva Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology University of Bremen Advanced Technology Institute University of Surrey Department of Chemistry University of the Free State

Nonmetal elements strictly govern the electrochemical performance of molybdenum ***,the exact role played by nonmetals during electrocatalysis remains largely *** intermetallic MoSi_2comprising silicene subunits,we present an unprecedented hydrogen evolution reaction(HER)behavior in aqueous alkaline *** continuous operation,the HER activity of MoSi_2shows a more than one order of magnitude improvement in current density from 1.1 to 21.5 mA cm^(à2)at 0.4 V ***,this activation behavior is highly reversible,such that voltage withdrawal leads to catalyst inactivation but another operation causes ***,the system shows dynamics strikingly analogous to the legendary Sisyphus’labor,which drops and recovers in a stepwise manner repeatedly,but never succeeds in reaching the top of the *** WSi_2behaves almost the same as MoSi_2,whereas other metal silicides with silicyne subunits,including CrSi_2and TaSi_2,do not exhibit any anomalous behavior.A thin amorphous shell of MoSi_2is observed after reaction,within which the Si remains partially oxidized while the oxidation state of Mo is basically ***-principles calculations further reveal that the adsorption of hydroxide ions on silicene subunit edges and the subsequent Si vacancy formation in MoSi_2jointly lead to the anomalous HER kinetics of the adjacent Mo active *** work demonstrates that the role of nonmetal varies dramatically with the electronic and crystallographic structures of silicides and that silicene structural subunit may serve as a promoter for boosting HER in alkaline media.

关键词： Sisyphus effect Electrochemistry Metal silicides Silicene subunit Hydrogen evolution reaction

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