Nontemplating Porous Carbon Material from Polyphosphamide Resin for Supercapacitors

The nontemplating preparation of porous carbon materials by using specially designed polymer precursors for supercapacitor is attracting considerable research attention because of the more controllable frame structure and easier processes than templating methods. Herein, a deliberately designed cross-linking polyphosphamide resin with defined N and P structure is synthesized and then carbonized to obtain porous carbon material. The as-obtained porous carbon material has a specific surface area of 2,620 m² g^-1, high porosity of 1.49 cm³ g^-1, and well-distributed micro/mesoporous carbon structure. Different from activation by post-added NH₄H₂PO₄, the confined N and P in the polymer frame are confirmed to play an important role in pore structure development by forming in situ highly dispersed NH₄H₂PO₄ during carbonization. When evaluated as the electrode material for supercapacitors, the polyphosphamide-resin-based porous carbon material demonstrates excellent capacitance (440 F g^-1 under 0.5 A g^-1) and high stability (retention of 93% over 10,000 cycles).