Disassembly–Reassembly Approach to RuO₂/Graphene Composites for Ultrahigh Volumetric Capacitance Supercapacitor

A porous, yet compact, RuO₂/graphene hybrid is successfully prepared by using a disassembly–reassembly strategy, achieving effective and uniform loading of RuO₂ nanoparticles inside compact graphene monolith. The disassembly process ensures the uniform loading of RuO₂ nanoparticles into graphene monolith, while the reassembly process guarantees a high density yet simultaneously unimpeded ion transport channel in the composite. The resulting RuO₂/graphene hybrid possesses a density of 2.63 g cm⁻³, leading to a record high volumetric capacitance of 1485 F cm⁻³ at the current density of 0.1 A g⁻¹. When the current density is increased to 20 A g⁻¹, it remains a high volumetric capacitance of 1188 F cm⁻³. More importantly, when the single electrode mass loading is increased to 12 mg cm⁻², it still delivers a high volumetric capacitance of 1415 F cm⁻³ at the current density of 0.1 A g⁻¹, demonstrating the promise of this disassembly–reassembly approach to create high volumetric performance materials for energy storage applications.