Multi-scale porous graphene/activated carbon aerogel enables lightweight carbonaceous catalysts for oxygen reduction reaction

Yang Yang, Honglong Chang

科研成果: 期刊稿件文章同行评审

9 引用 (Scopus)

摘要

The catalytic property toward oxygen reduction reaction (ORR) plays a significant role in the power generation of fuel cells (FCs). Here we demonstrate a graphene/activated carbon aerogel (GA/AC) composite to facilitate the ORR process, which is synthesized by a one-step hydrothermal method. The aligned pores and high porosity enable its mass density 20-times lighter than bare AC. Electrochemical studies show that the composite exhibits a remarkably improved electro-catalytic performance. The onset potential shifts positively from 0.68 to 0.83 V, and the number of electrons transferred is increased from 2.85 to 3.52, indicating that a four-electron pathway dominates the ORR process. This composite presents a mesoporous structure containing a large number of multi-scale pores and having a high specific surface area of 758.19 m2/g, which is responsible for its excellent onset potential and charge transfer rate. These aerogel-composites show great potential as ORR catalysts for assembling lightweight FCs and metal-air batteries.

源语言英语
页(从-至)1247-1257
页数11
期刊Journal of Materials Research
33
9
DOI
出版状态已出版 - 14 5月 2018

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