Exploration of the structural, electrochemical, and electrocatalytic properties of 2D-hBN-modified CaFeXCo1-XO3-δ perovskite: Light-enhanced asymmetric supercapacitor performance and hydrogen evolution catalysis applications

초록

This study reports on the hydrothermal synthesis, structural characterization, and electrochemical performance of CaFeXCo1-XO3-delta (CCF-x, where x = 0.6, 0.8) perovskite modified with 2D-hexagonal boron nitride (h-BN) in a solid-state CsSn0.925Na0.075Cl2.925 (CSNC) electrolyte. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), UV-Vis spectrophotometry, Brunauer-Emmett-Teller (BET) spectroscopy, and electrochemical impedance spectroscopy (EIS) confirm the successful fabrication and structural integrity of the hybrid material. Firstly, a three-electrode system is employed to evaluate the electrochemical performance. The CCF-0.8@h-BN composite electrodes exhibit remarkable performance, with a Qs of 1172C/g or 1953.33 F/g at 1.5 A/g. The resulting CCF-0.8@h-BN composite electrode was used as the positive electrode and activated carbon (AC) as a negative electrode to design a supercapattery hybrid device (CCF-0.8@h-BN//AC). This supercapattery hybrid device demonstrated enhanced electrochemical performance with a Qs of 272C/g, energy density of 60.44 Wh/kg, and power density of 1347.71 W/kg. HER studies confirmed the lowest overpotential of 67 mV, a 45 mV/dec Tafel slope, and the highest HER activity. This study demonstrates that the developed material effectively enhances the electrochemical performance of asymmetric supercapacitors under light illumination, highlighting its potential for next-generation light-enhanced energy storage applications.

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