Conductive polymer-integrated KTi2(PO4)3/CuMnSe2 nanocomposite for dual-functional energy storage and hydrogen evolution

초록

The design of advanced composite electrode materials with enhanced conductivity, structural stability, and redox activity is crucial for achieving high-performance energy storage systems. In this study, a novel KTP@CMS@PANI nanocomposite was successfully synthesized through a facile two-step approach. The KTP and CMS components were first prepared via the hydrothermal method, yielding a stable crystalline phosphateselenide framework with well-integrated interfaces. Subsequently, PANI was uniformly coated onto the KTP@CMS surface through situ oxidative polymerization. Comprehensive structural and morphological analyses conducted via X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed the successful formation of the hybrid heterostructure with high crystallinity and a uniformly coated nanostructured surface. BET surface area measurements revealed a hierarchically porous architecture, and electrochemical impedance spectroscopy (EIS) demonstrated reduced charge-transfer resistance. Electrochemical studies in a three-electrode configuration exhibited a remarkable specific capacity of 2116.12 C g- 1 at 1 A g- 1, indicating superior faradaic contribution and excellent reversibility. When assembled into a two-electrode asymmetric supercapacitor (ASC), the device achieved an outstanding specific capacity of 420.60 C g- 1 at 1 A g- 1, and a high energy density of 42 W h kg- 1 at a power density of 2263 W kg- 1, maintaining coulombic efficiency above 98% and retaining 91% capacitance over 10,000 cycles. Furthermore, the composite demonstrated promising hydrogen evolution reaction (HER) activity, characterized by a low overpotential and small Tafel slope, confirming its dual potential in energy storage and catalytic applications. These results position this composite as a promising electrode material for next-generation asymmetric supercapacitors and hybrid energy conversion devices.

키워드