原位聚合制备聚吡咯/石墨烯复合材料及其电化学性能研究

通过原位聚合法制备出聚吡咯/石墨烯(PPy/GE)复合材料。用红外光谱(FT-IR)、扫描电镜(SEM)、透射电镜(TEM)等分析手段对复合材料的结构和形貌进行表征,发现聚吡咯均匀地包覆在石墨烯表面。循环伏安测试表明复合材料对电极对I-/I3-电解质氧化还原体系具有较好的催化能力。电化学交流阻抗测试结果说明掺入聚吡咯后可有效降低石墨烯对电极的电荷转移阻抗。组装成染料敏化太阳能电池(DSSCs),在AM 1.5(100mW.cm-2)的模拟太阳光照射下,得到4.12%的光电转换效率。     

石墨烯/聚吡咯复合物的制备及超级电容性能研究

采用石墨烯/聚吡咯(r GO/PPY)复合物制备超级电容器,以弥补二者各自的不足。采用改进Hummers法制备出氧化石墨烯(GO)。利用水合肼还原法将GO还原后得到r GO,同时采用电化学聚合法制备出PPY。最后,用电沉积法直接在不锈钢网上制备出r GO/PPY复合物。得到的复合材料的比电容为209.04 F/g,显著高于r GO的比电容(52.42 F/g)。另外,循环1 000次后,复合材料的比电容下降18.1%,低于PPY(36.3%)。     

石墨烯/聚吡咯复合电极材料超电容性能研究进展

分析了目前石墨烯和聚吡咯(PPy)用作电极材料的不足,详细介绍了近年来超级电容器用石墨烯/PPy复合电极材料的研究进展,指出石墨烯/PPy复合材料在能量转换和存储领域的未来发展方向.     

聚吡咯/石墨烯复合气凝胶制备及超电容性能

为充分利用导电聚吡咯独特的掺杂结构与石墨烯气凝胶丰富的多孔结构,研究了氧化还原活性剂对聚吡咯/石墨烯气凝胶的结构及电化学性能的影响,并制备性能优异的电极复合材料.以对苯醌作为氧化还原活性剂,使用一步水热法制备聚吡咯/石墨烯水凝胶,冷冻干燥后制备得到氧化还原活性复合气凝胶.扫描电子显微镜结果表明,引入对苯醌后有利于获得有...     

聚吡咯/二氧化锰复合材料的制备及其电化学性能研究

利用水热法合成了海胆状MnO_2,通过吡咯聚合制备了PPy@MnO_2复合结构,研究了包覆时间、包覆量对PPy@MnO_2电化学性能的影响。用PPy@MnO_2纳米复合材料作为工作电极,在1 mol/L的Na_2SO_4溶液中利用三电极体系进行了电化学性能测试。PPy@MnO_2纳米复合材料的循环伏安、恒电流充放电和电化学阻抗谱(EIS)研究表明,PPy@α-MnO_2-60纳米复合材料在吡咯与二氧化锰质量比10∶1、包覆时间6 h时电化学性能最佳,在电流密度0.5 A/g时比电容值为177.3 F/g。     

聚吡咯/二氧化锰复合材料的制备及其电化学性能研究

利用水热法合成了海胆状MnO_2,通过吡咯聚合制备了PPy@MnO_2复合结构,研究了包覆时间、包覆量对PPy@MnO_2电化学性能的影响。用PPy@MnO_2纳米复合材料作为工作电极,在1 mol/L的Na_2SO_4溶液中利用三电极体系进行了电化学性能测试。PPy@MnO_2纳米复合材料的循环伏安、恒电流充放电和电化学阻抗谱(EIS)研究表明,PPy@α-MnO_2-60纳米复合材料在吡咯与二氧化锰质量比10∶1、包覆时间6 h时电化学性能最佳,在电流密度0.5 A/g时比电容值为177.3 F/g。     

石墨烯/二氧化锰复合材料的电化学性能

通过共沉淀法制备了石墨烯/二氧化锰复合材料,研究了不同质量比的石墨烯与二氧化锰对复合材料结构与性能的影响.通过X射线衍射分析了复合材料的微观结构,用扫描电子显微镜观察复合材料的表面形貌,用恒流充放电、循环伏安及交流阻抗谱研究复合材料的电化学性能.结果表明:制备的复合材料中二氧化锰为α型二氧化锰,其中,当石墨烯质量分数为26.5％的复合材料具有良好的电化学性能,当以6 mol/L的KOH溶液为电解质时,其比电容达到313F·g-1,循环伏安测试表明其电化学可逆性较好.     

聚苯胺和聚吡咯纳米颗粒的制备及其电化学性能研究

采用低温化学氧化法合成了聚苯胺和聚吡咯纳米颗粒,并以聚苯胺和聚吡咯纳米颗粒为电极材料,组装成电化学电容器,利用测试循环伏安、交流阻抗和恒流充放电性能研究两者的电化学性能。结果表明,低温下合成的聚苯胺和聚吡咯呈纳米颗粒堆积状,粒径分别为200,300 nm;当电流密度为1 mA/cm2时,在1 mol/L H2SO4电解液中,聚苯胺比电容达480.30 F/g,聚吡咯比电容达205.51 F/g。     

三维氧化石墨烯-Ag/泡沫镍复合材料的制备及其电化学性能

采用改进的Hummer法制备氧化石墨(GO),以干燥浸泡法制备三维氧化石墨烯(rGO)-Ag/泡沫镍(NF)复合材料,对其物相、形貌和组成进行分析,研究了其电化学性能. 结果表明,复合材料呈疏松多孔结构,Ag颗粒直径为200 nm,电流密度为5 mA/cm2时初次比容量为1.59 F/cm2,循环1000次后为初始容量的70%,循环稳定性良好.     

电化学法制备聚苯胺/氧化石墨烯复合膜及电容性能研究

利用电化学聚合法在导电玻璃ITO上原位制备了聚苯胺(PANI)/氧化石墨烯(GO)复合物薄膜。扫描电子显微镜表明,PANI/GO复合物呈颗粒状分布在ITO的表面;通过UV-vis光谱证实了GO和PANI之间存在着强烈的相互作用;充放电测试表明,PANI/GO复合膜具有良好的电荷储存特性,最高比电容可达265F/g,且具有较高的循环稳定性。     

一步水热法合成铜改性的介孔γ-Al_2O_3及其吸附脱硫性能研究

采用一步水热合成法,以Al(NO3)3为铝源,P123为模板剂,Na OH、Na2CO3和K2CO3分别为沉淀剂,Cu(NO3)2为铜源,制备出负载铜的金属有序介孔γ-Al2O3,并运用N2吸附-脱附和XRD等技术对其结构进行表征,同时探讨了铜改性的介孔γ-Al2O3对模型燃油中的噻吩的吸附性能。结果表明,这3种沉淀剂都能制备出比表面积大(>226 m2/g),孔径分布中心为3.3 nm,孔体积为0.27⁰.35 cm3/g的负载铜的介孔γ-Al2O3,且样品都保持了较好的介孔结构。样品对模型燃油中噻吩的吸附脱硫性能表明,用Na OH作为沉淀剂且负载铜的介孔γ-Al2O3样品对噻吩的吸附性能较好,原因在于此样品具有较大的比表面积且铜在此样品中的分散性较好。     

Preparation and electrochemical properties of polyaniline/reduced graphene oxide composites

Polyaniline (PANI)/reduced graphene oxide (rGO) composites were synthesized by in situ oxidative polymerization of aniline on reduced graphene sheets. Fourier transform infrared spectroscopy, X‐ray diffraction, thermogravimetric analysis, transmission electron microscopy, and scanning electron microscopy were used to characterize the composites. The results indicated PANI/rGO composites were produced and contained covalent bonds between the functional groups of PANI and rGO. A uniform coating of PANI on the rGO sheets had a synergistic effect on the properties of the composites. The electrochemical properties of the PANI/rGO composites produced using different feed ratios of aniline to rGO were studied. The results showed that the composites exhibited a maximum specific capacitance of 797.5 F/g at 0.5 A/g and minimum charge transfer resistance of 0.98 Ω when the feed ratio of aniline to rGO was 2:1. These values were superior to those of pure PANI and rGO. The composites also displayed excellent cycling stability, with specific capacitance retention of 92.43% after 1000 cycles. These stable structural composites show promise for the development of new supercapacitor applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46103.     

Preparation and enhanced electrochemical properties of Ag/polypyrrole composites electrode materials

Ag/polypyrrole (PPy) composites were synthesized with different dispersants via interface polymerization method. The morphology of the composites was investigated by scanning electron microscopy and transmission electron microscopy, and the results showed that the dispersant had strong effect on the morphology of the obtained composites. The structure of the products was characterized by Fourier transform infrared spectroscopy, and X‐ray diffraction. The specific capacitance and impedence of Ag/PPy composites electrode was evaluated through charge/discharge measurements and electrochemical impedance spectroscopy, respectively. Electrochemical performances indicated that Ag/PPy composite electrode used polyvinyl alcohol as dispersant exhibited the highest specific capacitance of 635.5 F/g at a current density of 2.45 mA/g, which provided potential application as supercapacitor materials. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

氧化石墨烯/天然橡胶复合材料的制备与性能

采用己内酰胺（CPL）改性氧化石墨烯（GO）（CPL-GO）,与天然橡胶（NR）复合后通过熔融共混法制备了CPL-GO/NR复合材料。考察了CPL-GO用量对CPL-GO/NR复合材料物理机械性能、界面相互作用和气体阻隔性能的影响。结果表明,CPL改性GO后,X射线衍射层间距增加,片层堆砌更为松散,CPL-GO与水接触角增至91.2°。当CPL-GO的质量分数为2.0%时,CPL-GO/NR复合材料的拉伸强度为26.1 MPa,较纯NR提高了50.9%。随着CPL-GO用量的增加,复合材料的储能模量增加,损耗因子的峰值减小,表明GO经CPL表面改性后与NR复合,增强了两相界面间的相互作用,从而提高了复合材料抵抗变形的能力。在40 ℃下,当CPL-GO的质量分数为3.0%时,CPL-GO/NR复合材料的气体渗透系数较纯NR下降了57.1%。     

ZnO/石墨烯复合材料的制备及性能研究

本文将采用溶胶-凝胶法制备纳米ZnO和通过Hummers法制备的石墨烯进行简单的一步超声复合,得到ZnO/石墨烯复合材料。利用XRD、TEM以及紫外可见分光光度计对所制备的ZnO和石墨烯样品进行测试表征,并以亚甲基蓝的降解效率来评价ZnO/石墨烯复合材料的光催化活性能。研究表明:ZnO/石墨烯的光催活性较纯氧化锌提高了4倍有余,当石墨烯质量比为15%时,ZnO/石墨烯的光催化活性最强。     

金刚烷胺/氧化石墨烯复合材料的制备及其吸附性能

以氧化石墨烯和金刚烷为原料，通过水相合成法制备了金刚烷胺功能化氧化石墨烯复合材料A/GO，以FT-IR、XRD和XPS对A/GO进行了结构表征，并考察了A/GO对有机染料的吸附性能。结果表明，与氧化石墨烯相比，A/GO对甲基蓝（AB93）表现出高效吸附性，其吸附动力学和吸附等温模型分别符合拟二级动力学和Langmuir模型，理论最大吸附容量（qm）为1250.0 mg/g。热力学分析表明，A/GO吸附AB93是自发的放热过程。A/GO吸附AB93对盐（NaCl和KCl）表现出良好的耐盐性，而CaCl2能有效地促进A/GO吸附AB93。对于刚果红和AB93等的混合染料体系，A/GO能选择性吸附AB93。     

Synthesis and electrochemical properties of graphene oxide/nanosulfur/polypyrrole ternary nanocomposite hydrogel for supercapacitors

A method for synthesizing Graphene oxide (GO)/nano‐sulfur/polypyrrole (PPy) ternary nanocomposite hydrogel is depicted. The higher surface area of GO, PPy porous structure and their excellent conductivity are utilized, and the GO hydrogel can be made easily. The products are characterized by field‐emission scanning electron microscopy (FESEM), X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, and electrochemical workstation. The results demonstrated that GO/nano‐S/PPy ternary nanocomposite hydrogel is successfully synthesized. The electrochemical properties are investigated by cyclic voltammetry, galvanostatic charge/discharge measurements, and cycling life in a three‐electrode system in 1M Li₂SO₄ electrolyte solution. The GO/nano‐S/PPy ternary nanocomposite hydrogel exhibit a high specific capacitance of 892.5 F g^?1 at scan rates of 5 mV s^?1 and the capacitance retain about 81.2% (594.8 F g^?1) of initial capacitance (732.5 F g^?1) after 500 cycles at a current density of 1 A g^?1. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40814.     

Preparation and properties of reduced graphene oxide/fused silica composites

An in situ strategy for fabrication of reduced graphene oxide/fused silica (rGO/FS) composites using 3-aminopropyltriethoxysilane as surfactant is reported. GO nanosheets were bound to FS particles by an electrostatic assembly between ultra thin negatively charged GO sheets and positively charged amino-modified FS particles. After spark plasma sintering, rGO/FS bulk composites have been produced from the GO and FS composite particles with GO being reduced to rGO in vacuum at high temperatures. Results show that rGO sheets were well dispersed in the matrix, and conductivity of these rGO/FS composites at room temperature was strongly dependent on the rGO nanosheet concentration. i.e., the conductivity of rGO/FS was increased to 10⁻⁴ S/cm when a conducting network was formed inside the composites. The effect of GO nanosheets on the mechanical properties of rGO/FS bulk composites was also investigated. The addition of 1 wt.% GO sheets to FS resulted in 72% increase in Vickers hardness, indicating the stress transfering from the FS matrix to the rigid rGO sheets. With the same rGO content, the fracture toughness of the as-prepared composites was increased by 74%. The main toughening mechanisms were thought to be crack deflection, crack branching, pulling-out and bridging of the rGO sheets.     

Preparation and characterization of graphite oxide/polypyrrole composites

Graphite oxide (GO)/polypyrrole (PPy) composites (GPs) and 1,5-naphthalene disulfonic acid (1,5-NDA) doped GPs (1,5-NGPs) have been successfully synthesized via in situ polymerization of pyrrole on GO. The conductivity of 1,5-NGPs is as high as 7 S/cm, seven orders of magnitude higher than that of pristine GO. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show PPy “dressed” on the surface of GO layers, while Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses confirm the interaction between GO and PPy. The results of thermogravimetric analysis (TGA) and heat treatment at 1000 °C show that the “dressed” PPy on the surface of GO layers in GPs and 1,5-NGPs has effectively prevented the deflagration of GO.