Graphene oxide assisted-MnO 2 nanoparticles enhanced laser-induced graphene based electrodes for supercapacitor application

Here, we have proposed a new scheme to enhance the electrochemical performance of LIG-based supercapacitors by combining the advantages of pseudocapacitive MnO 2 nanoparticles, easy-removed GO precursors, and programmable processing of LIG. The formation of GO-MnO 2 precursor with proper GO content not only preserves the abundant active sites of MnO 2 nanoparticles, but also ensures better ion transportation properties by adjusting the distribution of easy-stacking MnO 2 nanoparticles. Therefore, the as-prepared LIG-GO-MnO 2 films possess more active sites, better and more plentiful microstructures, and lower sheet resistance than solo LIG films, and the resultant LIG-GO-MnO 2 -based supercapacitors exhibit enhanced electrochemical performance compared with LIG based supercapacitors. Moreover, the LIG-GO-MnO 2 -based supercapacitors also display good cycling stability, with at least 92.59 % specific capacitance retention after 1000 cycling tests. And after more than nine months later, the LIG-GO-MnO 2 based-supercapacitor still shows a specific capacitance retention of ∼100 %. What's more, the need for additive connections. In-series LIG-GO-MnO 2 -based supercapacitors could be obtained by a single laser induced process owing to the performance uniformity of a single supercapacitor, which realize the voltage extension from 0.8 to 2. 4 V and power an LED. In this work, we have demonstrated the possibility of using GO as an auxiliary agent instead of routine roles as active materials and we hope this proposal will help expand the diversity of easy-removed nano-composite precursors in developing LIG-based devices in practical applications.