Intercalation of carbonate ions into Ce-doped NiCoAl layered double hydroxides using accelerated kinetics for high-performance hybrid supercapacitor electrodes

Abstract

Layered double hydroxides (LDHs) have attracted a lot of interest because of their tunable layered structure, high surface area, and redox activity, which lead to good electrochemical energy storage performance. The electrochemical performance of carbonate-intercalated Ce-doped NiCoAl LDH, synthesized by a simple hydrothermal route followed by anion exchange, was investigated in this work. The structural and morphological characterizations confirmed the effective doping and intercalation, which enhanced the electrochemical properties. Electrochemical studies showed that carbonate-intercalated Ce-doped NiCoAl LDH had the highest specific capacitance of about 2500 F g⁻¹ at 10 mV s⁻¹, which delivered both high rate capability and outstanding long-term cycling stability of about 88.4% after 10 000 cycles. These results show that carbonate-intercalated Ce-doped NiCoAl LDH is a promising candidate for high-performance energy storage.