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Science China(Technological Sciences) 2012年第6期55卷 1527-1534页

作者： chen YuanYuan chen shougang chen Yan SONG XianWang XU FengZhen Institute of Material Science and Engineering Ocean University of ChinaQingdao 266100China

A self-assembled 1-dodecanethiol film assisted with the preferential adhesion of polydopamine was prepared on the non-etching 304 stainless steel surfaces by a simple dip-coating *** formation and surface structure of the film were characterized by water contact angle measurement,atomic force microscopy(AFM),and X-ray photoelectron spectroscopy(XPS).The corrosion behavior of the complex films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy(EIS).The excellent corrosion resistance property could be attributed to the compact hybrid film structure and superior seawater stability for modified 304 stainless steel surface.

关键词： stainless steel polymer coatings EIS XPS AFM

Facile synthesis of lightweight 3D hierarchical Ni Co_(2)O_(4) nanoflowers/reduced graphene oxide composite foams with excellent electromagnetic wave absorption performance

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Journal of Materials Science & Technology 2021年第32期91卷 187-199页

作者： Ning Sun Wen Li Shuang Wei Hui Gao Wei Wang shougang chen School of Materials Science&Engineering Ocean University of ChinaQingdao266100China

Considering the high filling ratios,high densities,and narrow absorbing bandwidths of the current electromagnetic wave(EMW) absorbers,in this work,we successfully synthesized a 3 D hierarchical NiCo_(2) O_(4) nanoflowers/reduced graphene oxide(NiCo_(2) O_(4)/RGO) composite foam by a simple method under gentle *** NiCo_(2) O_(4) nanoflowers and unique 3 D foam structure are beneficial to the refraction and scattering of EMW,which endows the prepared 3 D foam with highly efficient EMW absorption *** the ratio between NiCo_(2) O_(4) and RGO in the foam is 1:1,5% mass fraction of NiCo_(2) O_(4/)RGO foam in paraffin wax can reach a minimum reflection loss(RL_(min)) value of-52.2 dB with a thin thickness merely 2.6 ***,the effective absorption bandwidth(EAB,RL exceeding-10 dB) is7.04 GHz that covers the whole Ku band(10.96-18 GHz).Moreover,the effects of the thickness of the absorber and the loading ratios of the foam in paraffin wax matrix on the EMW absorption properties are also carefully *** results indicate that the optimum EMW absorption performance of NiCo_(2) O_(4/)RGO can be tuned in different *** EMW absorption mechanism is ascribed to the proper impedance matching and larger dielectric and magnetic loss produced by the synergy of NiCo_(2) O_(4) and ***,the NiCo_(2) O_(4/)RGO hybrid foam is ideal candidate to be used as high-efficient EMW absorbers with low filling ratio,light weight,and broad frequency bandwidths.

关键词： NiCo_(2)O_(4)nanoflowers Reduced graphene oxide foam Lightweight Low filling ratio Broad bandwidth Electromagnetic wave absorber

High efficiency photothermal cyclic self-healing antibacterial coating based on in-situ dual-functional BiOI@Bi_(2)S_(3)

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Journal of Materials Science & Technology 2024年第6期173卷 121-136页

作者： Huimeng Feng Tong Wang Wei Wang chengcheng Ma Yanan Pu shougang chen School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Although extremely challenging,it is highly desirable to develop self-healing materials that exhibit high efficiency under environmental conditions for marine protection *** this work,polyurethane elastomers with hydrogen bond and dimethylglyoxime-urethane(DOU)coordination complex were combined with in-situ dual-functional BiOI@Bi_(2)S_(3) to synthesize high-efficiency photothermal cyclic self-healing antibacterial *** photothermal efficiency of BiOI@Bi_(2)S_(3) is improved by 38% through interfacial ***@Bi_(2)S_(3)/PU rapidly rises by 50.2℃ within 300 s under near-infrared(NIR)light,which can trigger the hydrogen bond of polyurethane coating and recover the barrier properties of the coating through *** functional theory was used to simulate and analyze the generation of multiple electron transfer paths after the vulcanization of BiOI,which improves the interfacial mobility of photogenerated carriers and generates more ***,molecular dynamics verified the self-healing mechanism of hydrogen bond and the photothermal lifting mechanism of the *** 5th scratches and self-healing cycle tests,the coating has a self-healing efficiency of more than 80%,which can ensure the self-healing and anticorrosion protection performance of the coating for multiple *** photocatalytic and photothermal properties of BiOI@Bi_(2)S_(3) enhance the antibacterial rate of the coating up to 99%.This work provides heuristic perspectives for the design of coatings with anti-corrosion,antibacterial and self-healing properties.

关键词： Self-healing Photothermal Interfacial regulation Dual-functional BiOI@Bi_(2)S_(3) Antibacterial

Electrochemical behavior of microbiologically influenced corrosion on Fe_3Al in marine environment

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Acta Metallurgica Sinica(English Letters) 2009年第4期22卷 313-320页

作者： Xueting CHANG shougang chen Guanhui GAO Yansheng YIN Sha chenG Tao LIU Institute of Materials Science and Technology Ocean University of China Qingdao 266100 China

In this article, microbiologically influenced corrosion behavior of Fe3Al intermetallie compound in microorganism culture medium has been investigated by using weight loss methods, electrochemical techniques, and electron microscopy. Polarization curves showed that a sharp electrical current peak caused by surface pitting could be observed after Fe3Al electrodes were immersed in culture medium for 15 days when the polarization potential was about -790 mV vs SCE. Based on the electrochemical impedance spectroscopy （EIS） and the equivalent circuit parameters of the associated system, the corrosion products were found to exhibit a two-layer structured feature and the microorganisms could induce pitting and erosion corrosion of the inner layer. In addition, the passivating film of the inner layer was absolutely destroyed by microbial metabolic products.

关键词： Electrochemical behavior Fe3Al Microbiologically influenced corrosion Marine

Preparation of dynamic polyurethane networks with UV-triggered photothermal self-healing properties based on hydrogen and ion bonds for antibacterial applications

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Journal of Materials Science & Technology 2023年第2期133卷 89-101页

作者： Huimeng Feng Wei Wang Tong Wang Lei Zhang Wen Li Jue Hou shougang chen School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Photo-induced self-healing composites have attracted more and more attention as a kind of materials that can be controlled remotely and accurately in real ***,we report a strategy of a photo-responsive system based on hydrogen and ion bonds capable of performing self-healing process by ultraviolet wave-lengths,which is covalently cross-linked zinc-dimethylglyoxime-polyurethane coordination network with triple dynamic *** recombination of hydrogen bond and metal coordination bond produces ef-fective healing *** self-healing behavior and temperature dependence of 3D micro-crack is investigated by molecular dynamics simulations to reveal the mechanism of self-healing at molecu-lar ***,the hybrid of copper-doped zinc oxide not only provides metal coordination bonds to enhance the self-healing rate,but also enhances the photothermal effect and anti-bacterial properties of ***,doping of copper generates more defects and forms a space charge layer on the surface of zinc *** defects could trap surface electrons and holes,preventing the recom-bination of photo-induced electron-hole pairs,generating more heat through lattice ***,under ultraviolet light irradiation,the polyurethane can reach 62.7°C for 60 s,and the scratches of the polyurethane can be healed within 30 min and fully healed within 1 h.

关键词： Cu-dopped ZnO Ionic bond Photothermal Self-healing Antibacterial

Mesoporous β-Co（OH）2 nanowafers and nanohexagonals obtained synchronously in one solution and their electrochemical hydrogen storage properties

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Progress in Natural Science:Materials International 2016年第6期26卷 555-561页

作者： Longqiang Wang Jingyuan Fu Yue Zhang Xiaoling Liu Yansheng Yin Lihua Dong shougang chen Institute of Materials Science and Engineering Ocean University of China College of Marine Science & Engineering Shanghai Maritime University

A water/oil two-phase solution strategy has been developed for the synthesis of various β-Co（OH）2nanostructures. More importantly, two different morphologies of β-Co（OH）2:mesoporous nanowafers and nanohexagons were successfully obtained through one reaction. Furthermore, the special mesoporous of β-Co（OH）2nanowafers and nanohexagons exhibited excellent electrochemical hydrogen storage capacities and cycling stability. The maximum capacity reached 265.9 and 215.7 mA hg-1at room temperature, *** 70 cycles, the discharging capacities of the electrode still remain above 218.2 and 175.4 mA hg-1, which indicates that the as-prepared mesoporous β-Co（OH）2nanowafers have a strong resistance against oxidation and corrosion. These results indicates that the mesoporous β-Co（OH）2nanowafers and nanohexagons may be potentially applied for electrochemical hydrogen storage.

关键词： β-Co(OH)2 Nanowafers Nanohexagonals Electrochemical hydrogen storage

A triboelectric/electromagnetic hybrid generator for efficient wind energy collection and power supply for electronic devices

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Science China(Technological Sciences) 2021年第9期64卷 2003-2011页

作者： XU GuanPing ZHENG YouBin FENG YanGe MA Shaochen LUO Ning FENG Min chen shougang WANG DaoAi State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Harvesting energy from ambient environment has been considered as a promising strategy for driving portable electronic devices in a sustainable way. A wind driven triboelectric-electromagnetic hybrid nanogenerator has been fabricated to convert wind energy into electricity. It is composed of an electromagnetic generator(EMG) and a triboelectric nanogenerator(TENG) with the output power of 35 and 0.32 mW, respectively when the wind speed is 5 m/s. Generally, TENG shows a low current output with a high voltage output characteristic, on the contrary the EMG shows a high current output and a low voltage output. This hybrid nanogenerator overcomes these problems and exhibits comprehensive and efficient performance on scavenging ***, in view of the output performance and charging ability of the hybrid nanogenerator, it shows high stability, making it suitable for charging capacitors or batteries and driving portable electronics sustainably. A new structure of integrated TENG and EMG was designed to harvest wind energy, which shows potential applications in portable and small device power supply system, especially in the areas of remote mountains, deserts, islands, etc., as emergency power supply.

关键词： TENG electromagnetic generator wind energy self-powered selective power supply

Influence of Calcareous Deposit on Corrosion Behavior of Q235 Carbon Steel with Sulfate-Reducing Bacteria

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Journal of Ocean University of China 2017年第6期16卷 1213-1219页

作者： ZHANG Jie LI Xiaolong WANG Jiangwei XU Weichen DUAN Jizhou chen shougang HOU Baorong Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China University of Chinese Academy of Sciences Beijing 10049 P. R. China Institute of Material Science and Engineering Ocean University of China Qingdao 266100 P. R. China

Cathodic protection is a very effective method to protect metals, which can form calcareous deposits on metal surface. Research on the interrelationship between fouling organism and calcareous deposits is very important but very limited, especially sulfate-reducing bacteria(SRB). SRB is a kind of very important fouling organism that causes microbial corrosion of metals. A study of the influence of calcareous deposit on corrosion behavior of Q235 carbon steel in SRB-containing culture medium was carried out using electrochemical impedance spectroscopy(EIS), scanning electron microscopy(SEM) and surface spectroscopy(EDS). The calcareous deposit was formed with good crystallinity and smooth surface under the gradient current density of -30 μA cm^(-2) in natural seawater for 72 h. Our results can help elucidate the formation of calcareous deposits and reveal the interrelationship between SRB and calcareous deposits under cathodic protection. The results indicate that the corrosion tendency of carbon steel was obviously affected by Sulfate-reducing Bacteria(SRB) metabolic activity and the calcareous deposit formed on the surface of carbon steel under cathodic protection was favourable to reduce the corrosion rate. Calcareous deposits can promote bacterial adhesion before biofilm formation. The results revealed the interaction between biofouling and calcareous deposits, and the anti-corrosion ability was enhanced by a kind of inorganic and organic composite membranes formed by biofilm and calcareous deposits.

关键词： microbiological corrosion sulfate-reducing bacteria calcareous deposit cathodic protection

Stable biomimetic film on Fe_3Al surface for corrosion resistance in seawater

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Science China(Technological Sciences) 2008年第7期51卷 975-978页

作者： chen shougang, LIU Tao & YIN YanSheng Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China 1. Institute of Materials Science and Engineering Ocean University of China Qingdao 266100 China

Stable superhydrophobic n-tetradecanoic acid (CH3(CH2)14COOH) film was pre- pared by means of sol-gel and self-assembly techniques, with a very high seawater contact angle (158°) and a small sliding angle (<5°). There are many microconvexi-ties with binary structure uniformly distributed on the surface atop the film with an average diameter of about 80 nm by observation of scanning electron microscope (SEM), and the film surface structure is similar to that of lotus surface. The corrosion resistance behavior of intermetallic Fe3Al with the biomimetic superhydrophobic film surface is improved obviously when compared with pure Fe3Al sample by measurement of electrochemical impedance spectroscopy (EIS).

关键词： corrosion thin films coatings Fe3Al nanocrystalline materials

Extremely high-rate aqueous supercapacitor fabricated using doped carbon nanoflakes with large surface area and mesopores at near-commercial mass loading

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Nano Research 2017年第5期10卷 1767-1783页

作者： Nan Mao Huanlei Wang Yang Sui Yongpeng Cui Jesse Pokrzywinski Jing Shi Wei Liu shougang chen Xin Wang David Mitlin Institute of Materials Science and Engineering Ocean University of China Qingdao 266100 China Chemical & Biomolecular Engineering and Mechanical Engineering Clarkson University 8 Clarkson Avenue Potsdam NY 13699 USA

Achieving a satisfactory energy-power combination in a supercapacitor that is based on all-carbon electrodes and operates in benign aqueous media instead of conventional organic electrolytes is a major challenge. For this purpose, we fabricated carbon nanoflakes （20-100 nm in thickness, 5-μm in width） containing an unparalleled combination of a large surface area （3,000 m2-g-1 range） and mesoporosity （up to 72%）. These huge-surface area functionalized carbons （HSAFCs） also had a substantial oxygen and nitrogen content （N10 wt.% combined）, with a significant fraction of redox-active carboxyl/phenol groups in an optimized specimen. Their unique structure and chemistry resulted from a tailored single-step carbonization-activation approach employing （2-benzimidazolyl） acetonitrile combined with potassium hydroxide （KOH）. The HSAFCs exhibited specific capacitances of 474 F-g-1 at 0.5 A.g-1 and 285 F-g-1 at 100 A.g-1 （charging time 〈 3 s） in an aqueous 2 M KOH solution. These values are among the highest reported, especially at high currents. When tested with a stable 1.8-V window in a 1 M Na2SO4 electrolyte, a symmetric supercapacitor device using the fabricated nanoflakes as electrodes yielded a normalized active mass of 24.4 Wh-kg-1 at 223 W·kg-1 and 7.3 Wh·kg-1 at 9,360 W·kg-1. The latter value corresponds to a charge time of 〈3 s. The cyclability of the devices was excellent, with 93% capacitance retention after 10,000 cycles. All the electrochemical results were achieved by employing electrodes with near-commercial mass loadings of 8 mg-cm-2.

关键词： energy storage high power activated carbon graphene doped carbon heteroatoms