石墨烯
气凝胶
催化作用
化学
碳纤维
炭黑
化学工程
色散(光学)
纳米颗粒
电子转移
纳米技术
材料科学
兴奋剂
无机化学
光化学
复合材料
有机化学
复合数
天然橡胶
物理
光电子学
光学
工程类
作者
Zhong‐Shuai Wu,Shubin Yang,Yi Sun,Khaled Parvez,Xinliang Feng,Kläus Müllen
摘要
Three-dimensional (3D) N-doped graphene aerogel (N-GA)-supported Fe3O4 nanoparticles (Fe3O4/N-GAs) as efficient cathode catalysts for the oxygen reduction reaction (ORR) are reported. The graphene hybrids exhibit an interconnected macroporous framework of graphene sheets with uniform dispersion of Fe3O4 nanoparticles (NPs). In studying the effects of the carbon support on the Fe3O4 NPs for the ORR, we found that Fe3O4/N-GAs show a more positive onset potential, higher cathodic density, lower H2O2 yield, and higher electron transfer number for the ORR in alkaline media than Fe3O4 NPs supported on N-doped carbon black or N-doped graphene sheets, highlighting the importance of the 3D macropores and high specific surface area of the GA support for improving the ORR performance. Furthermore, Fe3O4/N-GAs show better durability than the commercial Pt/C catalyst.
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