Thadathil Anjitha, Ismail Yahya A, Periyat Pradeepan
Department of Chemistry, University of Calicut Kerala India 673635
Department of Environmental Studies, Kannur University Kerala India 670567
RSC Adv. 2021 Nov 5;11(57):35828-35841. doi: 10.1039/d1ra04946a. eCollection 2021 Nov 4.
A facile two-step strategy has been reported for the preparation of a ternary 3D reduced graphene oxide/NiZnFeO/polyindole nanocomposite (GNP) and this composite is applied as an electrode material for supercapacitor applications. Remarkably, NiZnFeO nanoparticles (NZF) decorated on reduced graphene oxide (GN2) are achieved by a facile hydrothermal method followed by coating with polyindole (PIN) through an emulsion polymerization process. The structure, porosity, morphology, and thermal stability of the resulting ternary GNP hybrid material were characterized X-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area measurements, transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). This combination of hybrid material has a favorable mesoporous structure that enables high exposure of active sites for fast electron transport for supercapacitor applications. We demonstrate here that the ternary GNP hybrid electrode material is capable of delivering a favorable specific capacitance of ∼320 F g at 0.3 A g within the potential range from -0.1 to 1 V, with desirable rate stability and excellent cycling stability in the three-electrode system. Furthermore, an asymmetric supercapacitor (ASC) of a two-electrode configuration was fabricated using 3D RGO and GNP as the negative and positive electrodes, respectively. Such a device manifests a favourable of 48.9 F g at 0.5 A g and retains stability of 84% even after 2000 cycles. This ASC device exhibits a significant energy density of 16.38 W h kg at a power density of 1784 W kg. The synergistic effects of pseudo and double layer capacitive contributions from PIN and GN2 make this ternary GNP hybrid electrode material of great promise in supercapacitor applications.
据报道，一种简便的两步法策略可用于制备三元三维还原氧化石墨烯/NiZnFeO/聚吲哚纳米复合材料（GNP），该复合材料被用作超级电容器应用的电极材料。值得注意的是，通过简便的水热法在还原氧化石墨烯（GN2）上修饰NiZnFeO纳米颗粒（NZF），随后通过乳液聚合过程用聚吲哚（PIN）进行包覆。通过X射线衍射（XRD）、拉曼光谱、布鲁诺尔-埃米特-特勒（BET）表面积测量、透射电子显微镜（TEM）和热重分析（TGA）对所得三元GNP杂化材料的结构、孔隙率、形态和热稳定性进行了表征。这种杂化材料的组合具有良好的介孔结构，能够使活性位点高度暴露，以实现超级电容器应用中快速的电子传输。我们在此证明，三元GNP杂化电极材料在-0.1至1 V的电位范围内，在0.3 A g下能够提供约320 F g的良好比电容，在三电极系统中具有理想的倍率稳定性和出色的循环稳定性。此外，分别使用三维还原氧化石墨烯（RGO）和GNP作为负极和正极，制备了两电极配置的不对称超级电容器（ASC）。这种器件在0.5 A g下表现出48.9 F g的良好比电容，即使在2000次循环后仍保持84%的稳定性。该ASC器件在1784 W kg的功率密度下表现出16.38 W h kg的显著能量密度。PIN和GN2的赝电容和双电层电容贡献的协同效应使得这种三元GNP杂化电极材料在超级电容器应用中具有很大的前景。
