Fabrication of g-C3N4 Nanomesh-Anchored Amorphous NiCoP2O7: TunedCycling Life and the Dynamic Behavior of a Hybrid Capacitor

摘要

Developing a novel electrode material with better electrochemical behavior and extended cyclability is a major issue in the field of hybrid capacitors. In this work, we propose a novel strategy for the facile synthesis of nickel–cobalt pyrophosphate nanoparticles anchored on graphitic carbon nitride (NiCoP2O7/g-C3N4) via the simple solvothermal method. Field emission scanning electron microscopy and transmission electron microscopy analysis revealed the uniform anchoring of NiCoP2O7 nanocomposite on g-C3N4 nanosheets. Benefitting from the effect of amorphous nature and a conductive matrix of the NiCoP2O7/g-C3N4 (NP3) composite, the material achieves a specific capacitance of 342 F g^–1 at a scan rate of 5 mV s^–1. Impressively, the electrode shows long-term cycling stability with 100% capacitance retention over 5000 cycles. Employing activated carbon as an anode and as-prepared NP3 as a cathode, the assembled asymmetric hybrid cell exhibits high-energy density and exceptional cyclability (specific capacitance retention over 10 000 cycles). The outstanding electrochemical and cyclicstability is attributed to the shortest electron-ion pathway witheffective interfacial interaction. The low electronic resistance ofthe NiCoP2O7/g-C3N4 nanocompositeis revealed by varying the bias voltage variation in the electrochemicalimpedance spectroscopy. Our results promise better utilization ofthe bimetallic pyrophosphate-anchored g-C₃N₄ matrix as a potential electrode for high-performance energy storagedevices.