Neiva Eduardo G C, Oliveira Marcela M, Bergamini Márcio F, Marcolino Luiz H, Zarbin Aldo J G
Departamento de Química, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990, Curitiba, P. R., Brazil.
Departamento de Química e Biologia, Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, P. R., Brazil.
Sci Rep. 2016 Sep 22;6:33806. doi: 10.1038/srep33806.
Different nanocomposites between reduced graphene oxide (rGO) and Ni(OH) nanoparticles were synthesized through modifications in the polyol method (starting from graphene oxide (GO) dispersion in ethylene glycol and nickel acetate), processed as thin films through the liquid-liquid interfacial route, homogeneously deposited over transparent electrodes and spectroscopically, microscopically and electrochemically characterized. The thin and transparent nanocomposite films (112 to 513 nm thickness, 62.6 to 19.9% transmittance at 550 nm) consist of α-Ni(OH) nanoparticles (mean diameter of 4.9 nm) homogeneously decorating the rGO sheets. As a control sample, neat Ni(OH) was prepared in the same way, consisting of porous nanoparticles with diameter ranging from 30 to 80 nm. The nanocomposite thin films present multifunctionality and they were applied as electrodes to alkaline batteries, as electrochromic material and as active component to electrochemical sensor to glycerol. In all the cases the nanocomposite films presented better performances when compared to the neat Ni(OH) nanoparticles, showing energy and power of 43.7 W h kg and 4.8 kW kg (8.24 A g) respectively, electrochromic efficiency reaching 70 cm C and limit of detection as low as 15.4 ± 1.2 μmol L.
通过对多元醇法进行改进（从氧化石墨烯（GO）在乙二醇和醋酸镍中的分散体开始），合成了还原氧化石墨烯（rGO）与氢氧化镍（Ni(OH)）纳米颗粒之间的不同纳米复合材料，通过液 - 液界面途径将其加工成薄膜，均匀沉积在透明电极上，并进行了光谱、显微镜和电化学表征。这些薄且透明的纳米复合薄膜（厚度为112至513nm，在550nm处的透光率为62.6至19.9%）由均匀装饰在rGO片材上的α - Ni(OH)纳米颗粒（平均直径为4.9nm）组成。作为对照样品，以相同方式制备了纯Ni(OH)，其由直径范围为30至80nm的多孔纳米颗粒组成。纳米复合薄膜具有多功能性，被用作碱性电池的电极、电致变色材料以及甘油电化学传感器的活性成分。在所有情况下，与纯Ni(OH)纳米颗粒相比，纳米复合薄膜表现出更好的性能，分别显示出43.7W h kg的能量和4.8kW kg（8.24A g）的功率，电致变色效率达到70cm C，检测限低至15.4±1.2μmol L。
