Three-dimensional hierarchical nanostructured porous TiO2 aerogel/Cobalt based metal-organic framework (MOF) composite as an electrode material for supercapattery

Three-dimensional hierarchical nanostructured porous TiO2 aerogel/Co-MOF composites were synthesized via a one-step modified sol-gel method. The composite materials were used as an electrode material for supercapattery and their electrochemical performances were assessed. The obtained results showed that the addition of Co-MOF improved the specific capacity; achieved a maximum value of 111.2 C/g at 0.8 A/g which is higher than pure TiO2 aerogel (66.4 C/g) and is relatively high compared with other TiO2/carbon composites. The improved performance of the composite-based electrode is because of the synergistic effects of enriched electroactive site, high surface area, reduced pore size, low internal resistance and good mechanical stability offered by the incorporation of MOF. Further, a supercapattery (TiO2 aerogel/Co-MOF composite//activated carbon) was fabricated and delivered a high specific power of 1875 W/kg with an impressive capacity retention of 93% after 5000 charge-discharge cycles.