Fig. 1. Schematic illustration of fabricating LIG-Fe₃O₄ composite-based micro-supercapacitor

Fig. 2. CLSM images of LIG-Fe₃O₄ composite electrode. (a) Edge of PI and LIG-Fe₃O₄ composite electrode; (b) edge height variation curve of PI and LIG-Fe₃O₄ composite electrode; (c) surface of LIG-Fe₃O₄ composite electrode

Fig. 3. SEM images of LIG-Fe₃O₄ composite electrode. (a) Low magnification SEM image of LIG-Fe₃O₄ composite electrode; (b) high magnification SEM image of LIG-Fe₃O₄ composite electrode

Fig. 4. Characterization of LIG and LIG-Fe₃O₄ composite material components. (a) XPS; (b) high-resolution Fe 2p spectrum; (c) Raman spectrum; (d) X-ray diffraction(XRD) patterns of LIG and LIG-Fe₃O₄ composite electrode

Fig. 5. Performance test of LIG-based micro-supercapacitor. (a) CV curves at different scanning rates; (b) GCD curves at different current densities; (c) area specific capacitances at different scanning rates; (d) area specific capacitances at different current densities

Fig. 6. Performance test of LIG-Fe₃O₄ composite-based micro-supercapacitor. (a) CV curves at different scanning rates; (b) GCD curves at different current densities; (c) area specific capacitances at different scanning rates; (d) area specific capacitances at different current densities

Fig. 7. Performance test of LIG-Fe₃O₄-based micro-supercapacitors in series and parallel connection. (a) Schematic diagram of LIG-Fe₃O₄ composite-based micro-supercapacitors in series and parallel connection; (b) CV curves of single device, three devices in series and parallel connection; (c) GCD curves of single device, three devices in series and parallel connection