Abstract
The development of efficient and durable bifunctional catalysts for oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) is desirable but remains a great challenge. Herein, a series of new three-dimensional (3D) nitrogen, phosphorus and sulfur doped porous graphene (NPS G) were fabricated by facile and cost-effective strategy, as efficient bifunctional electrocatalysts for direct methanol fuel cell. To obtain superior ORR and MOR bifunctional catalytic activities, we optimized the doping amount of nitrogen, phosphorus and sulfur in catalysts. The resulting metal-free NPS G2 catalyst had a long-term stability, desirable four electron pathway and excellent methanol poisoning tolerance. Moreover, NPS G2 exhibited higher onset potential compared to other metal-free NPS G, and close to commerical Pt/C catalyst current density under the same conditions. In addition, a series of NPS G used as good supports for Pt nanoparticles. Pt/NPS G2 catalyst displayed remarkable electrochemical performance, better cyclic stability and tolerance in methanol electrooxidation reaction.
Published Version
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