Multifunctional shape-stabilized phase change composites based upon multi-walled carbon nanotubes and polypyrrole decorated melamine foam for light/electric-to-thermal energy conversion and storage

•MWCNTs and PPy decorated MF sponge was utilized as supporting substrate.•The decorated MF sponge showed highly porosity and great encapsulation capacity.•SSPCCs demonstrated prominent photo/electro to thermal conversion capability.•SSPCCs had prominent strengths in temperature regulation and heat preservation.