Two birds with one stone strategy of 2D MOF derived heterostructure for supercapacitor and electromagnetic absorption applications

Composite materials incorporating carbon skeletons and metal oxides exhibit considerable potential for applications as supercapacitors and electromagnetic (EM) absorbers. Herein, we concurrently integrate their merits in three C/M (M=Fe, Cu, Co) composites. Highly dispersed nanoparticles on the carbon layers generate abundant heterointerfaces, and the carbon framework derived from 2D MOF also provides crucial structural contribution to EM absorption. The structural evolution of the C/M hybrid heterostructure has been deeply analyzed. Consequently, C/Fe-700 demonstrates excellent specific capacitance of 168.7 F g-1 at 0.5 A g-1 and EM absorption performance, featuring a strong reflection loss down to -57.3 dB and a broad response bandwidth of 5.49 GHz. Through a comprehensive investigation of the structural evolution within the materials, this study delineates a feasible approach for diverse applications in both supercapacitors and EM absorbers.