A novel Cr 2 O 3 -carbon composite as a high performance pseudo-capacitor electrode material

Abstract Novel graphitic material containing chromium oxide (Cr 2 O 3 ) nanoribbons is obtained by carbonizing a mixture of polyfurfuryl alcohol and MIL–101(Cr) at 900 °C. Morphological, structural, and chemical analysis of the product is carried out with HR–TEM, SEM, XPS, XRD, and BET surface area. The maximum BET surface area recorded for the nanocomposite is 438 m 2  g −1 . The nanocomposite exhibits a specific capacitance as high as 300 F g −1 at 2 mV s −1 and 291 F g −1 at 0.25 A g −1 , and presents 95.5% long–term cycling stability over 3000 cycles. The pseudo-capacitive role of Cr 2 O 3 nanoribbons is found to be important towards total capacitance of nanocomposite material.