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Rare Metals 2017年第9期36卷 691-697页

作者： Peng Guo Yang Shen Yu Song Jing Ma Yuan-Hua Lin Ce-Wen Nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Laboratory of Advanced Energy Storage Materials and Devices Research Institute of Tsinghua University in ShenzhenShenzhen 518057China

Flexible thin-film supercapacitors with high specific capacitance are highly desirable for modern wearable or micro-sized electrical and electronic applications. In this contribution, Ni-Co hydroxides（NCH）nanosheets were deposited on top of Ni-Cu alloy（NCA）nanowire arrays forming a freestanding thin-film composite electrode with hierarchical structure for *** electrochemical cycling, the dissolution of Cu into Cu ions will create more active sites on NCA, and the redeposited copper oxide can be coated onto NCH, giving rise to substantial increase in specific capacitance with cycling. Meanwhile, NCA and NCH have excellent conductivity, thus leading to excellent rate performance. This flexible thin-film electrode delivers an ultrahigh initial specific capacitance of 0.63 F·cm^（-2）（or 781.3 F·cm^（-3））.During charge-discharge cycles, the specific capacitance can increase up to 1.18 F·cm^（-2）（or 1475 F·cm^（-3）） along with the“self-etching”process. The electrode presents a better specific capacitance and rate capability compared with previously reported flexible thin-film electrode, and this novel design of etching technique may expand to other binary or ternary materials.

关键词： Nickel Cobalt Copper hydroxides Supercapacitors

Single-crystalline layered double hydroxides with rich defects and hierarchical structure by mild reduction for enhancing the oxygen evolution reaction

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Science China Chemistry 2019年第10期62卷 1365-1370页

作者： Peng Zhou Junying He Yuqin Zou Yanyong Wang Chao Xie Ru Chen Shuangquan Zang Shuangyin Wang Key Laboratory of Chem/Bio-Sensing and Chemometrics Provincial Hunan Key Laboratory for Graphene Materials and DevicesCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China Shenzhen Institute of Hunan University Shenzhen 518057China

The oxygen evolution reaction(OER)with sluggish reaction kinetics and large overpotential is the critical reaction in water splitting that is promising for energy storage and *** double hydroxides(LDHs),due to their unique lamellar structure and flexibility of chemical component,are very competing material candidates for ***,the morphology structure and the electronic structure of LDHs were simultaneously tuned to improve the OER catalytic activity by mild solvothermal reduction using ethylene *** increased surface area,the introduction of oxygen vacancies and the construction of hierarchical structure greatly enhanced the electro-catalytic activity of LDHs for *** as-prepared LDHs showed a lower over-potential as low as 276 mV at a current density of 10 mA cm-2,and a small Tafel slope of 40.3 mV dec-1 accompanied with good *** work provides an efficient way to the design and optimization of advanced catalysts in the future.

关键词： single crystalline layered double hydroxides defects hierarchical structure oxygen evolution reaction

Enhanced protective coatings on Ti-10V-2Fe-3Al alloy through anodizing and post-sealing with layered double hydroxides

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Journal of Materials Science & Technology 2020年第2期37卷 104-113页

作者： Lei Liua Liang Wu Xiaobo Chen Deen Sun Yuan Chen Gen Zhang Xingxing Ding Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Engineering RMIT UniversityCity CampusCarltonVIC3053Australia

Anodic oxidation is a prevalent technique to introduce superior corrosion and wear resistance upon the surface of titanium(Ti)alloys,in which the selection of appropriate electrolytes and defect-sealing strategies is a *** study aims to address such issues through anodizing Ti-10V-2Fe-3Al alloy in malic acid,followed by a post-sealing treatment with Mg-Al layered double hydroxides(LDHs).The characteristics of the samples were investigated using scanning electron microscopy(SEM),atomic force microscopy(AFM),glow discharge optical emission spectroscopy(GDOES),X-ray diffraction(XRD)and energy-dispersive X-ray spectroscopy(EDS).SEM micrographs reveals that the anodic coating had a surface full of bulges and cracks,and was almost sealed by the following LDHs *** pattern indicate that the anodic coating was mainly consisted of amorphous TiO2 with a small fraction of anatase,but its crystallization degree was increased through the ***,electrochemical and tribological measurements demonstrate that corrosion current density was 2.8×10-6,2.0×10-7,5.9×10-9A cm-2,and wear rate was 1.45×10-3,1.30×10-4 and 6.90×10-5 mm3 N-1 m-1 for respective bare Ti-10V-2Fe-3Al alloy substrate,anodized specimens without and with the LDHs post ***,a plausible wear mechanism was proposed.

关键词： Titanium alloy Malic acid Layered double hydroxides Sealing Corrosion resistance Tribological properties

Efficient adsorption of Mn(Ⅱ) by layered double hydroxides intercalated with diethylenetriaminepentaacetic acid and the mechanistic study

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Journal of Environmental Sciences 2019年第11期31卷 56-65页

作者： Mingjie Huang Yingxin Zhang Wei Xiang Tao Zhou Xiaohui Wu Juan Mao School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Water and Wastewater Treatment(HUST) MOHURD Wuhan 430074 China

In this study,greatly enhanced Mn(Ⅱ) adsorption was achieved by as-synthesized diethylenetriaminepentaacetate acid intercalated Mg/Al layered double hydroxides (LDHs-DTPA).The adsorption capacity of LDHs-DTPA was 83.5 mg/g,which is much higher than that of LDHs-EDTA (44.4 mg/g),LDHs-Oxalate (21.6 mg/g) and LDHs (28.8 mg/g).The adsorption data of aqueous Mn(Ⅱ) using LDHs-DTPA could be well described by the pseudosecond order kinetics and Langrnuir isotherm *** study results also showed that the adsorption process of Mn(Ⅱ) by LDHs-DTPA was exothermic as indicated by the negative △H ***,based on the structural,morphological and thermostable features,as well as FT-IR and XPS characterizations of LDHs-DTPA and the pristine LDHs,the adsorption mechanism of Mn(Ⅱ) was *** carboxyl groups of DTPA were proposed to be the main binding sites for Mn(Ⅱ),and the hydroxyl groups of LDHs also played a minor role in the adsorption *** the three common regeneration reagents,0.1 mol/L Na2CO3 was the best for reusing LDHs-DTPA in Mn(Ⅱ) ***,the Mn(Ⅱ) adsorption performance could be hindered in the presence of typical inorganic ions,especially *** specific modifications of LDHs-DTPA are suggested to get more selective adsorption of Mn(ll) in practical applications.

关键词： Layered double hydroxides Diethylenetriaminepentaacetate acid (DTPA) Mn(Ⅱ) Adsorption Inorganic ions

Preparation and Anti-ultraviolet Aging Performance of Organic Layered Double hydroxides/Bitumen Composites

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Journal of Wuhan University of Technology(Materials Science) 2019年第4期34卷 979-986页

作者： XU Song YU Jianying KE Yunbin XUE Lihui HU Changbin College of Civil Engineering Fuzhou UniversityFuzhou 350108China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School ofCivil Engineering and Architecture Taizhou UniversityTaizhou 318000China

Layered double hydroxides(LDHs) with the physical property of high ultraviolet(UV)reflectance were used to enhance the anti-UV aging performance of bitumen. In view of the poor compatibility of LDHs with bitumen, three organic anions, namely, sodium dodecyl benzenesulfonate(SDBS), sodium dodecyl sulfate(SDS) and sodium dodecyl sulfonate(SDSO), were used as modifiers to prepare organic LDHs(OCLDHs) through regeneration process, and the crystal structure, chemical composition, morphological feature and UV shielding capability of synthesized OCLDHs were analyzed. Then the OCLDHs were added into bitumen to evaluate the storage stability and anti-UV aging property of OCLDHs/bitumen *** results show that the organic anions are inserted into the interlayers of LDHs, the intercalation expands the interlayer distance of LDHs, makes the particle shapes become more irregular and complicated, and enhances the absorption ability within the range from 200 to 300 nm while has little influence on the UV reflection *** of high temperature storage stability indicates the organic modification ameliorates the compatibility of LDHs with bitumen. Compared with LDHs, OCLDHs decrease the deteriorations of bitumen’s properties during UV exposure test, exhibiting better effect in enhancing anti-UV aging performance of bitumen. Furthermore,among the three OCLDHs, LDHs intercalated by SDBS exhibit the most effective improvement due to the best compatibility with bitumen and comparatively good UV shielding effect.

关键词： layered double hydroxides bitumen organic modification compatibility ultraviolet aging performance

The unmediated choline sensor based on layered double hydroxides in hydrogen peroxide detection mode

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Science China Chemistry 2009年第12期52卷 2281-2286页

作者： DING ShouNian SHAN Dan YAO WenJuan XUE HuaiGuo SUN YueMing COSNIER Serge School of Chemistry&Chemical Engineering Southeast UniversityNanjing 211189China Key Laboratory of Environmental Materials&Environmental Engineering of Jiangsu Province Yangzhou 225002China School of Chemistry&Chemical Engineering Yangzhou UniversityYangzhou 225002China Départment de Chimie Moléculaire UMR-5250 ICMG FR-2607CNRS UniversitéJoseph FouierBP-53Grenoble 38041France

In this work,we have developed a novel choline biosensor on the basis of immobilization of choline oxidase (ChOx) by the attractive materials layered double hydroxides (LDHs). Amperometric detection of choline was evaluated by holding the modified electrode at 0.5 V (vs. SCE). Due to the special properties of LDHs ([Zn3-Al-Cl]),such as chemical inertness,high porosity,and swelling property,the [Zn3-Al-Cl]/ChOx modified electrode exhibited an enhanced analytical performance. The biosensor provided a linear response to choline over a concentration range from 3.7 × 10-6 to 6.3 × 10-4 M with a low detection limit of 3 × 10-7 M based on S/N=3. The apparent Michaelis-Menten constant was calculated to be 1.38 mM. In addition,the interaction between ChOx and LDHs has also been investigated using FT-IR spectroscopy.

关键词： layered double hydroxides clay choline oxidase choline biosensor

Preparation and Characterization of Lignosulfonate Intercalated Layered Double hydroxides and Their Application in Improving Ultraviolet Aging Resistance for Bitumen

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Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 446-452页

作者：何边阳余剑英 HU Wei WAN Xiaodong WU Zhongkui State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology China Electric Power Research Institute

In order to develop economically anti-ultraviolet(UV) aging additives to bitumen and extend the comprehensive utilization of lignin materials, lignosulfonate(LS) was selected to intercalate into layered double hydroxides(LDHs), then the LS intercalated LDHs(LS-LDHs) were applied to improve UV aging resistance of bitumen. With the characterization of X-ray diffraction(XRD), Fourier transform infrared(FTIR) spectroscopy, chemical analysis and scanning electron microscopy(SEM), LS was successfully intercalated into the galleries of LDHs. The ultraviolet and visible(UV-vis) absorbance curves showed LS-LDHs had excellent UV absorptive ability from 200 to 400 nm. Thermogravimetry and differential scanning calorimetry(TG-DSC) indicated LS-LDHs could have a good thermal stability during the processing of bitumen. Compared with the LDHs, the LS-LDHs exhibited better performance in UV aging resistance of bitumen.

关键词： layered double hydroxides lignosulfonate bitumen ultraviolet aging resistance

Effect of Non-Thermal Plasma Modified NiAl Layered Double hydroxides on the Removal of Fluoride from Aqueous Solution

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American Journal of Analytical Chemistry 2014年第9期5卷 547-558页

作者： Hongxiao Lu Qiurong Li Haiyan Xiao Ranran Wang Danyang Xie Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical Engineering Yanshan University Qinhuangdao China

In this paper, NiAl layered double hydroxides (NiAl-LDHs) has been modified by non-thermal plasma (NTP) to enhance the fluoride removal capacity of materials. The samples were characterized by X-ray diffraction, Fourier transform infrared spectrometer (FTIR), Thermogravimetric differential thermal analyzer (TG-DTA) and N2 adsorption-desorption. Effects of pH, co-existing anions, temperature and kinetics on F﹣ adsorption were investigated. The results showed that pH affects the adsorbent surface charge. The effective pH range for F﹣ removal was between 4.5 and 10. Lower pH potentially causes dissolution of NiAl-LDHs. The negligible interference of coexisting ions such as makes the NiAl-LDHs a promising sorbent for fluoride polluted water treatment.

关键词： Adsorption NiAl Layered Double hydroxides Non-Thermal Plasma Fluoride

Organic-Inorganic Hybrid Materials:Layered Double hydroxides and Cellulose Acetate Films as Phosphate Recovery

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Journal of Agricultural Science and Technology(B) 2018年第6期8卷 360-374页

作者： Gustavo Franco de Castro Jader Alves Ferreira Denise Eulálio Allan Robledo Fialho e Moraes Vera Regina Leopoldo Constantino Frederico Garcia Pinto Roberto Ferreira Novais Jairo Tronto Department of Soil University of VicosaAv.Peter Henry RolfsBulding Silvyo Starling BrandaoCEP 36570-000Vicosa(MG)Brazil Department of Chemistry University of VicosaRio Paranaiba CampusHighway MG-230KM 07CEP 38810-000Rio Paranaiba(MG)Brazil Department of Fundamental Chemistry University of Sao PauloAv.Prof.Lineu Prestes748CEP 05508-000Sao Paulo(SP)Brazil

With demand increasing for phosphate recovery,a considerable share of current research is dedicated to elaborate multifunctional *** this way,the objective of this work was to produce hybrid films from the combination of cellulose acetate(CA)biopolymer and magnesium and aluminium layered double hydroxides(LDHs)and investigate their performance for phosphate *** this work,the following materials were prepared and characterized:LDH,calcinated LDH(LDH-c),CA film(CAF),CA film with LDH(CAF-LDH)and CA film with LDH-c(CAF-LDH-c).The produced materials were characterized by X-ray diffraction,thermogravimetric analysis coupled with differential scanning calorimetry and mass spectrometry,attenuated total reflectance Fourier transform infrared spectroscopy and scanning electronic *** thickness,H2O absorption(AH2O),stability in H2O and phosphate adsorption of the produced films were *** adsorption capacity of films was compared to LDHs in powder *** CAF-LDH and CAF-LDH-c increased film thickness,where CAF-LDH-c was thicker than ***-LDH-c had higher AH2O than the other films,because of its increased thickness and mainly because of the H2O sorption process of these materials.H2O stability of 98.97%for CAF-LDH and 96.81%for CAF-LDH-c suggest the produced films can maintain their structural properties even after a long contact period with aqueous *** the CAF-LDH-c,the maximum adsorption capacity of phosphate,according to the Langmuir-Freundlich model,was 6.98 mg/*** adsorption value suggests that this film can be used as an efficient phosphorus(P)adsorbent from wastewater or a eutrophicated source.

关键词： Cellulose acetate films layered double hydroxides phosphorous adsorption phosphorous recovery

Ultrafine monolayer Co-containing layered double hydroxide nanosheets for water oxidation

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Journal of Energy Chemistry 2019年第7期28卷 57-63页

作者： Xiaodan Jia Xin Zhang Jiaqing Zhao Yufei Zhao Yunxuan Zhao Geoffrey I.N.Waterhouse Run Shi Li-Zhu Wu Chen-Ho Tung Tierui Zhang Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences.Beijing 100049 China School of Chemistry and Chemical Engineering Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina School of Chemical Sciences The University of AucklandAuckland 1142New Zealand

For many two-dimensional(2D)materials,low coordination edges and corner sites offer greatly enhanced catalytic performance compared to basal sites,motivating the search for new synthetic approaches towards ultrathin and ultrafine 2D nanomaterials with high specific surface *** date,the synthesis of catalysts that are both ultrathin(monolayer)and ultrafine(lateral size<10nm)has proven extremely ***,using a facile ultrasonic exfoliation procedure,we describe the successful synthesis of ultrafine ZnCo-LDH nanosheets(denoted as ZnCo-UF)with a size^3.5 nm and thickness^0.5 *** single layer ZnCo-UF nanosheets possess an abundance of oxygen vacancies(Vo)and unsaturated coordination s让es,thereby affording outstanding electrocatalytic water oxidation *** calculations confirmed that Vo on the surface of ZnCo-UF enhanced H20 adsorption via increasing the electropositivity of the nanosheets.

关键词： Layered double hydroxides Ultrafine nanosheets Oxidation evolution reaction