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Conversion coatings of Mg-alloy AZ91D using trihexyl(tetradecyl) phosphonium bis(trifluoromethanesulfonyl)amide ionic liquid

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science China Chemistry 2012年第8期55卷 1598-1607页

作者： HOWLETT P. C. GRAMET S. LIN J. EFTHIMIADIS J. CHEN X. B. BIRBILIS N. FORSYTH M. arc centre of Excellence for electromaterials science Institute for Frontier Materials Deakin Univerxlty Burwood Campus Burwood Victoria 3125 Australia CAST Cooperative Research centre Department of Materials Engineering Monash University Melbourne Victoria 3800 Australia

This work reveals the performance of a trihexyl(tetradecyl)phosphonium bis(trifluoromethanesulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid (IL) conversion coating upon AZ91D. Such conversion coatings represent a novel avenue for chromate replacement. An optimization of coating performance was pursued by careful alloy pretreatment to generate a surface on which the coating performs best, as the AZ91 substrate is distinctly different from pure or dilute Mg alloys. The results reveal that a functional conversion coating can be achieved, retarding anodic dissolution kinetics, causing a significant decrease in corrosion rate. The coating efficacy is closely tied to the pretreatment performed, which dictates both the microstructural and electrochemical heterogeneity of the surface. The resulting coatings were found to contain MgxFx and phosphonium cation related components, the proportions of which were dependent on the pretreatment.

关键词： AZ91D corrosion conversion coating ionic liquid pretreatment

Electrochemical CO2 reduction over nitrogen-doped SnO2 crystal surfaces

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Journal of Energy Chemistry 2019年第6期28卷 22-30页

作者： Yuefeng Zhang Jianjun Liu Zengxi Wei Quanhui Liu Caiyun Wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina arc centre of Excellence for electromaterials science. Intelligent Polymer Research Institute AIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia

Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for CO2 *** catalyst SnO2 can convert CO2 molecules into valuable formic acid(HCOOH).Incorporating heteroatom N into SnO2 further improves its catalytic *** understand the mechanism and realize a highly efficient CO2-to-HCOOH conversion,we used density functional theory(DFT)to calculate the free energy of CO2 reduction reactions(CO2RR)on different crystal planes of N-doped SnO2(N-SnO2).The results indicate that N-SnO2 lowered the activation energy of intermediates leading to a better catalytic performance than pure *** also discovered that the N-Sn O2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the CO2-to-HCOOH *** intermediate of CO2RR on N-SnO2 is HCOO*or COOH* instead of OCHO*.These results may provide useful insights into the mechanism of CO2RR,and promote the development of heteroatomdoped catalyst for efficient CO2RR.

关键词： CO2 reduction reaction SnO2 Crystal surface Electrocatalysis First principles

“To measure is to know”: how advances in image analysis are supporting neural repair strategies

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Neural Regeneration Research 2015年第7期10卷 1040-1042页

作者： Pascal Vallotton Robert Michail Ivan Kapsa Digital Productivity Flagship CSIRO Locked Bag 17 North Ryde NSW Australia arc centre for electromaterials science University of Wollongong (IPRI) Fairy Meadow NSW Australia

Neuronal regeneration in the peripheral nervous system arises via a synergistic interplay of neurotrophic factors,integrins,cytoskeletal proteins,mechanical cues,cytokines,stem cells,glial cells and astrocytes.

关键词： To measure is to know how advances in image analysis are supporting neural repair strategies

Metal porphyrin intercalated reduced graphene oxide nanocomposite utilized for electrocatalytic oxygen reduction

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Green Energy & Environment 2017年第3期2卷 285-293页

作者： Mingyan Wang Qing Wang Wei Zhu Ying Yang Huixian Zhou Fan Zhang Lihua Zhou Joselito M.Razal Gordon G.Wallace Jun Chen Jiangsu Marine Resources Development Research Institute Huaihai Institute of Technology Institute of Frontier Materials Deakin University Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials Science Australian Institute of Innovative Materials University of Wollongong

In this paper, we report a simple and facile self-assembly method to successfully fabricate cationic metal porphyrin-MtTMPyP(Mt= Cobalt(Ⅱ), Manganese(Ⅲ), or Iron(Ⅲ); TMPyP = 5, 10, 15, 20-tetrakis(N-methylpyridinium-4-yl) porphyrin) intercalated into the layer of graphene oxide(GO) by the cooperative effects of electrostatic and π-π stacking interaction between positively charged metal porphyrin and negatively charged GO sheets. Followed by reduction with hydrazine vapor, a series of novel 2 D MtTMPyP/rGO_n were fabricated. The as-prepared 2 D hybrids were fully characterized and tested as non-noble metal catalysts for oxygen reduction reaction(ORR) in an alkaline medium. The MtTMPyP/rGO_n hybrids, especially CoTMPyP/rGO_5, demonstrated an improved electrocatalytic activity for ORR and a number of exchanged electrons close to 4-electron reaction, increased stability and excellent tolerance to methanol, showing a potential alternative catalyst for ORR in fuel cells and air batteries.

关键词： Metal porphyrin Reduced graphene oxide Intercalation Oxygen reduction reaction Catalyst

Three-dimensional bioprinting speeds up smart regenerative medicine

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National science Review 2016年第3期3卷 331-344页

作者： Qi Gu He Zhu Jing Li Xia Li Jie Hao Gordon G.Wallace Qi Zhou State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of Sciences arc centre of Excellence for electromaterials science(ACES) Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of Wollongong

Biological materials can actively participate in the formation of bioactive organs and can even control cell fate to form functional tissues that we name as the smart regenerative medicine(SRM). The SRM requires interdisciplinary efforts to finalize the pre-designed organs. Three-dimensional(3D) printing, as an additive manufacturing technology, has been widely used in various fields due to its high resolution and individuation. In SRM, with the assistance of 3D printing, cells and biomaterials could be precisely positioned to construct complicated tissues. This review summarizes the state of the SRM advances and focuses in particular on the 3D printing application in biofabrication. We further discuss the issues of SRM development and finally propose some approaches for future 3D printing, which involves SRM.

关键词： 3D bioprinting regenerative medicine biomaterials tissues

Bifunctional air electrodes for flexible rechargeable Zn-air batteries

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Chinese Chemical Letters 2021年第3期32卷 999-1009页

作者： Xiaoling Lang Zhibiao Hu Caiyun Wang Fujian Provincial Key Laboratory of Clean Energy Materials Longyan UniversityLongyan 364000China arc centre of Excellence for electromaterials science Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of WollongongNorth WollongongNSW 2500Australia

Flexible rechargeable Zn-air batteries are considered as one of the most promising battery systems to drive flexible and wearable electronic devices owing to their high safety,high gravimetric energy density,low self-discharge and low *** of the key challenges is to develop air electrodes with high performance and high mechanical *** minireview discusses the recent progress in the design and fabrication of flexible air *** focuses on the latest innovations in bifunctional oxygen reduction reaction and oxygen evolution reaction electrocatalysts,mainly including carbon-based materials(e.g.,heteroatom-doped carbon,metal-nitrogen moieties doped carbon),metal oxides(e.g.,spinel oxides,perovskite oxides)and their *** aims to provide an insight into the structureproperty relationship of bifunctional *** also discuss the challenges and future perspectives.

关键词： Zn-air batteries Flexible air electrodes Bifunctional catalysts Carbon materials Metal oxides

Electrospun CoSe@N-doped carbon nanofibers with highly capacitive Li storage

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Journal of Energy Chemistry 2019年第6期28卷 160-166页

作者： Jiandong Liu Jiaojiao Liang Caiyun Wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia College of Traffic Engineering Hunan University of TechnologyZhuzhou 412001、HunanChina

One-dimensional nano-structured materials have attracted attention due to its unique properties afforded such as the across-linked structures and large aspect *** this work,one-dimensional CoSe@N-doped carbon nanofibers(CoSe@NCNFs)are successfully by combining the techniques of electrospinning and *** powder are directly dispersed in the polyacrylonitrile/N,N-Dimethylformamide(DMF)solution containing cobalt salt to form the *** performance of these materials was investigated in Li-ion batteries after the annealing at different *** Co Se@NC nanofibers annealed at 550℃(CoSe@NC-550)and displayed excellent storage properties,affording a high capacity of 796 m Ah·g-1at a current density of 1 A·g^-1 for 100 ***,it is confirmed that the pseudocapacitive contribution of CoSe@NC-550 is up to 72.8%at the scan rate of 1 mV/s through the cyclic voltammetry analysis.

关键词： CoSe Anode Nanofibers Electrospinning Li-ion batteries

Fiber Materials for Electrocatalysis Applications

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Advanced Fiber Materials 2022年第4期4卷 720-735页

作者： Fangzhou Zhang Jun Chen Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China arc centre of Excellence for electromaterials science Intelligent Polymer Research Institute(IPRI)Australian Institute of Innovative Materials(AIIM)University of WollongongWollongongNSW 2522Australia

Fiber materials are promising for electrocatalysis applications due to their structural features including high surface area,controllable chemical compositions,and abundant composite *** the past decade,considerable research efforts have been devoted to construct advanced fiber materials possessing conductive network(to facilitate efficient electron transport)and large specific surface area(to support massive catalytically active sites)to boost electrocatalysis ***,we focused on recent advances in fiber-based electrocatalyst with enhanced electrocatalytic ***,the synthesis,structure,and properties of fiber materials and their applications in hydrogen evolution reaction,oxygen evolution reaction,oxygen reduction reaction,carbon dioxide reduction reaction,and nitrogen reduction reaction are ***,the research challenges and future prospects of fiber materials in electrocatalysis applications are proposed.

关键词： Fiber electrocatalyst Synthesis approach Structural feature Structural engineering Electrocatalytic performance

Perspective of nitrate reduction and nitrogen neutral cycle

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Chinese Journal of Structural Chemistry 2023年第6期42卷 1-3页

作者： Lin Gu Min Kuang Jun Chen Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China arc centre of Excellence for electromaterials science Intelligent Polymer Research InstituteAustralian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2522Australia

Nitrogen is one of the most abundant elements on earth and plays an indispensable role in living organisms and industrial processes[1].The natural nitrogen cycle is a basic element cycle in the global biogeo-chemical ... 详细信息

关键词： cycle earth neutral