Enhanced Performance of Laser-Induced Graphene Supercapacitors via Integration with Candle-Soot Nanoparticles
Arnab Ghosh, Sukhman Kaur, Gulshan Verma, Christian Dölle, Raheleh Azmi, Stefan Heißler, Yolita M. Eggeler, Kunal Mondal, Dario Mager, Ankur Gupta, Jan G. Korvink, De‐Yi Wang, Ashutosh Sharma, Monsur Islam
Abstract
Laser-induced graphene (LIG) has been emerging as a promising electrode material for supercapacitors due to its cost-effective and straightforward fabrication approach. However, LIG-based supercapacitors still face challenges with limited capacitance and stability. To overcome these limitations, in this work, we present a novel, cost-effective, and facile fabrication approach by integrating LIG materials with candle-soot nanoparticles. The composite electrode is fabricated by laser irradiation on a Kapton sheet to generate LIG material, followed by spray-coating with candle-soot nanoparticles and annealing. Materials characterization reveals that the annealing process enables a robust connection between the nanoparticles and the LIG materials and enhances nanoparticle graphitization. The prepared supercapacitor yields a maximum specific capacitance of 15.1 mF/cm 2 at 0.1 mA/cm 2, with a maximum energy density of 2.1 μWh/cm 2 and a power density of 50 μW/cm 2 . Notably, the synergistic activity of candle soot and LIG surpasses the performances of previously reported LIG-based supercapacitors. Furthermore, the cyclic stability of the device demonstrates excellent capacitance retention of 80% and Coulombic efficiency of 100% over 10000 cycles.