State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Nanoscale. 2011 Oct 5;3(10):4240-6. doi: 10.1039/c1nr10592b. Epub 2011 Aug 19.
Layered double hydroxides (LDHs), also known as hydrotalcite-like anionic clays, have been investigated widely as promising electrochemical active materials. Due to the inherently weak conductivity, the electrochemical properties of LDHs were improved typically by utilization of either functional molecules intercalated between LDH interlayer galleries, or proteins confined between exfoliated LDH nanosheets. Here, we report a facile protocol to prepare NiAl-LDH/graphene (NiAl-LDH/G) nanocomposites using a conventional coprecipitation process under low-temperature conditions and subsequent reduction of the supporting graphene oxide. Electrochemical tests showed that the NiAl-LDH/G modified electrode exhibited highly enhanced electrochemical performance of dopamine electrooxidation in comparison with the pristine NiAl-LDH modified electrode. Results of high-resolution transmission electron microscopy and Raman spectra provide convincing information on the nanostructure and composition underlying the enhancement. Our results of the NiAl-LDH/G modified electrodes with the enhanced electrochemical performance may allow designing a variety of promising hybrid sensors via a simple and feasible approach.
层状双氢氧化物（LDHs），也称为水滑石类阴离子粘土，已被广泛研究作为有前途的电化学活性材料。由于固有导电性差，通常通过利用插层在 LDH 层间夹层中的功能分子，或夹在剥离的 LDH 纳米片之间的蛋白质，来改善 LDHs 的电化学性能。在这里，我们报告了一种使用常规共沉淀法在低温条件下制备 NiAl-LDH/石墨烯（NiAl-LDH/G）纳米复合材料的简便方法，随后还原支撑的氧化石墨烯。电化学测试表明，与原始 NiAl-LDH 修饰电极相比，NiAl-LDH/G 修饰电极对多巴胺电氧化具有更高的电化学性能。高分辨率透射电子显微镜和拉曼光谱的结果提供了增强的基础的纳米结构和组成的令人信服的信息。NiAl-LDH/G 修饰电极具有增强的电化学性能的结果可能允许通过简单可行的方法设计各种有前途的混合传感器。
