Investigation of electrochemical features of a novel Ni2P2O7-Polyaniline nanohybrid as electroactive material in high-reliable supercapacitors

Abstract

A novel nanohybrid of Ni₂P₂O₇-Polyanaline (NPP) has been engineered to study energy storage performance. The nanohybrid was fabricated by surface coating of Ni₂P₂O₇ layered nanostructure (NPL) with the conductive polymer polyaniline (PANI). Initially, pristine Ni₂P₂O₇ layered nanostructure (NPL) was synthesized through single-step hydrothermal approach. Subsequently, hybrid composite (NPP) was constructed using in-situ oxidative polymerization of aniline monomer. The structural, morphological, and compositional properties of synthesized samples were characterized via XRD, FTIR, SEM, TEM, XPS and BET analysis. The electrochemical performances of the materials were evaluated for supercapacitor performance using Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD) test, Electrochemical Impedance analysis (EIS), and cyclic stability assessments. The results demonstrated that the hybrid composite exhibited significantly enhanced capacitance of 1333.9 F/g at 1 mV/s, 1150 F/g at 1 A/g from CV and GCD measurements respectively, including impressive stability performance, retaining 95% of its capacitance over 7000 CV cycles. Furthermore, symmetrical supercapacitor device constructed using NPP electrodes and operated at potential window of 1.6 V. The assembled symmetric device demonstrated superior energy density, power density, and cycling performance. The improvements in the performance of the three and two-electrode systems are attributed to PANI coating on the NPL surface, indicating that the hybrid composite is promising candidate for highly reliable supercapacitors.