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Graphitic carbon nitride-graphene hybrid nanostructure as a catalyst support for polymer electrolyte membrane fuel cells

机译:石墨碳氮化物 - 石墨烯杂化纳米结构作为聚合物电解质膜燃料电池的催化剂载体

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摘要

Graphitic carbon nitrides form a class of semiconducting graphene-like polymeric materials with visible light absorption and photocatalytic properties. In addition to high nitrogen content and tunable structure, it was shown that graphitic carbon nitride based on polytrazine imide (PTI) sheets exhibit excellent anti-corrosion ability in ex-situ fuel cell environments. However, in bulk form, their low surface area and poor conductivity limits their applications in fuel cells. In this work, PTI was exfoliated to form an ink made from single to few-layer nanosheets. The ink was then processed to produce 3D networks of carbon nitride nanosheets/reduced graphene oxide (PTI-rGO) hybrid aerogel with large interconnecting pores for fast mass transport of reactants and high surface area. The material was decorated with platinum nanoparticles, and then investigated for its electrochemical properties and applications as a catalyst support for polymer electrolyte membrane (PEM) fuel cells. Initial results show that the cathode catalytic activity of Pt/rGO-PTI hybrid is significantly improved in comparison to Pt/PTI or Pt/rGO. In addition, the in-situ fuel cell performance of Pt/PTI as anode catalyst is comparable to commercial Pt/C especially at low densities, making it attractive as an alternative, durable anode catalyst support material to conventional carbon black.
机译:石墨碳氮化物形成一类具有可见光吸收和光催化特性的半导体类石墨烯聚合物材料。除了高氮含量和可调结构之外,还表明基于聚吡嗪酰亚胺(PTI)片材的石墨氮化碳在非原位燃料电池环境中表现出出色的抗腐蚀能力。然而,以散装形式,它们的低表面积和差的导电性限制了它们在燃料电池中的应用。在这项工作中,PTI被剥落形成一种由单层到几层纳米片制成的油墨。然后,对墨水进行处理,以生成具有大的互连孔的3D碳氮化物纳米片/氧化石墨烯(PTI-rGO)混合气凝胶3D网络,以实现反应物的快速质量传输和高表面积。该材料用铂纳米粒子装饰,然后研究了其电化学性质以及作为聚合物电解质膜(PEM)燃料电池的催化剂载体的应用。初步结果表明,与Pt / PTI或Pt / rGO相比,Pt / rGO-PTI杂化物的阴极催化活性显着提高。另外,Pt / PTI作为阳极催化剂的原位燃料电池性能可与市售Pt / C相媲美,特别是在低密度下,使其成为常规炭黑的替代,耐用阳极催化剂载体材料具有吸引力。

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