College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, Hunan, China.
School of Biology and Chemical Engineering, Panzhihua University, Panzhihua, 617000, Sichuan, China.
Chem Asian J. 2019 Dec 2;14(23):4337-4344. doi: 10.1002/asia.201901299. Epub 2019 Nov 6.
A core-shell NiAlO@polypyrrole composite (NiAlO@PPy) with a 3D "sand rose"-like morphology was prepared via a facile in situ oxidative polymerization of pyrrole monomer, where the role of PPy coating thickness was investigated for high-performance supercapacitors. Microstructure analyses indicated that the PPy was successfully coated onto the NiAlO surface to form a core-shell structure. The NiAlO@PPy exhibited a better electrochemical performance than pure NiAlO, and the moderate thickness of the PPy shell layer was beneficial for expediting the electron transfer in the redox reaction. It was found that the NiAlO@PPy prepared at 5.0 mL L addition amount of pyrrole monomer demonstrated the best electrochemical performance with a high specific capacitance of 883.2 F g at a current density of 1 A g and excellent capacitance retention of 91.82 % of its initial capacitance after 1000 cycles at 3 A g . The outstanding electrochemical performance of NiAlO@PPy were due to the synergistic effect of NiAlO and PPy, where the uniform network-like PPy shell with the optimal thickness made electrolyte ions more easily accessible for faradic reactions. This work provided a simple approach for designing organic-inorganic core-shell materials as high-performance electrode materials for electrochemical supercapacitors.
一种具有 3D“沙玫瑰”形态的核壳型 NiAlO@聚吡咯复合材料（NiAlO@PPy）通过吡咯单体的简单原位氧化聚合制备而成，其中研究了 PPy 涂层厚度在高性能超级电容器中的作用。微观结构分析表明，PPy 成功地包覆在 NiAlO 表面上形成核壳结构。与纯 NiAlO 相比，NiAlO@PPy 表现出更好的电化学性能，而 PPy 壳层厚度适中有利于加快氧化还原反应中的电子转移。研究发现，在添加量为 5.0 mL L 的吡咯单体的条件下制备的 NiAlO@PPy 表现出最佳的电化学性能，在 1 A g 的电流密度下具有 883.2 F g 的高比电容，在 3 A g 下经过 1000 次循环后，其初始电容的电容保持率为 91.82%。NiAlO@PPy 的优异电化学性能归因于 NiAlO 和 PPy 的协同效应，其中均匀的网络状 PPy 壳具有最佳的厚度，使电解质离子更易于进行法拉第反应。这项工作为设计有机-无机核壳材料作为电化学超级电容器的高性能电极材料提供了一种简单的方法。
