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We synthesize 3-dimensional, free-standing solid foams through ISISA (ice segregation induced self-assembly) technique followed by high-temperature thermal treatment, having a high porosity of 97%, using multiwall carbon nanotubes (MWCNTs) and graphene oxide as the initial materials.The as-prepared rGO-CNT foam has an ordered macroporous honeycomb-like structure straight and parallel voids in the range of 10 μm to 30μm separated by cell walls several tens ofnanometers thick.