Non-covalent functionalization of reduced graphene oxide using sulfanilic acid azocromotrop and its application as a supercapacitor electrode material
- Non-covalent functionalization of reduced graphene oxide using sulfanilic acid azocromotrop and its application as a supercapacitor electrode material
- Milan Jana; Sanjit Saha; KHANRA PARTHA; Pranab Samanta; 구혜영; Naresh Chandra Murmu; Tapas Kulia
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 3, NO 25, 7323-7331
- Sulfanilic acid azocromotrop (SAC) modified reduced graphene oxide (SAC-RGO) was prepared by simple non-covalent functionalization of graphene oxide (GO) followed by post reduction using hydrazine monohydrate. Spectral analysis (Fourier transform infrared, Raman and X-ray photoelectron spectroscopy) revealed that successful modification had occurred of GO with SAC through p–p interaction. The electrical conductivity of SAC-RGO was found to be 551 S m 1. The capacitive performance of SAC-RGO was recorded using a three electrode set up with 1 (M) aqueous H2SO4 as the electrolyte. The –SO3H functionalities of SAC contributed pseudocapacitance as evidenced from the redox peaks (at 0.43 and 0.27 V) present in the cyclic voltammetric (CV) curves measured for SACRGO.The contribution of electrical double layer ca pacitance was evidenced from the near rectangular shaped CV curves and resulted in a high specific capacitance of 366 F g 1 at a current density of 1.2 A g 1 for SAC-RGO electrode. An asymmetric device (SAC-RGO//RGO) was designed with SAC-RGO as the positive electrode and RGO as the negative electrode. The device showed an energy density of 25.8 W h kg 1 at a power density of 980 W kg 1. The asymmetric device showed retention in specific capacitance of 72% after 5000 charge–discharge cycles. The Nyquist data of the device was fitted with
Z-view and different components (solution resistance, charge-transfer resistance and Warburg elements) were calculated from the fitted curves.
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