Synthesis of Mesoporous ZIF‐8 Nanoribbons and their Conversion into Carbon Nanoribbons for High‐Performance Supercapacitors

ZIF‐8 nanoribbons, with tunable morphology and pore structure, were synthesized by using the tri‐block co‐polymer Pluronic F127 as a soft template. The as‐synthesized ZIF‐8 nanoribbons were converted into carbon nanoribbons by thermal transformation with largely preserved morphology and porosity. The resulting carbon nanoribbons feature both micro‐ and meso‐pores with high surface areas of over 1000 m 2 g −1 . In addition, nitrogen‐doping in the carbon nanoribbons was achieved, as confirmed by XPS and EELS measurements. The hybrid carbon nanoribbons provide pseudo‐capacitance that promotes electrochemical performance, rendering a high specific capacitance of up to 297 F g −1 at a current density of 0.5 A g −1 in a three‐electrode system. A long cycle life was also demonstrated by recording a 90.26 % preservation of capacitance after 10 000 cycles of charge–discharge at a current density of 4.0 A g −1 . Furthermore, a symmetrical supercapacitor is fabricated by employing the carbon nanoribbons, which shows good electrochemical performance with respect to energy, power and cycle life.