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Nitrogen‐Doped Graphene/Carbon Nanotube Hybrids: In Situ Formation on Bifunctional Catalysts and Their Superior Electrocatalytic Activity for Oxygen Evolution/Reduction Reaction
Author(s) -
Tian GuiLi,
Zhao MengQiang,
Yu Dingshan,
Kong XiangYi,
Huang JiaQi,
Zhang Qiang,
Wei Fei
Publication year - 2014
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201303715
Subject(s) - bifunctional , catalysis , graphene , carbon nanotube , oxygen reduction reaction , materials science , oxygen evolution , oxygen reduction , in situ , nanotube , nitrogen , doping , oxygen , electrocatalyst , carbon fibers , chemical engineering , inorganic chemistry , nanotechnology , electrochemistry , chemistry , electrode , organic chemistry , composite number , optoelectronics , engineering , composite material
There is a growing interest in oxygen electrode catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as they play a key role in a wide range of renewable energy technologies such as fuel cells, metal‐air batteries, and water splitting. Nevertheless, the development of highly‐active bifunctional catalysts at low cost for both ORR and OER still remains a huge challenge. Herein, we report a new N‐doped graphene/single‐walled carbon nanotube (SWCNT) hybrid (NGSH) material as an efficient noble‐metal‐free bifunctional electrocatalyst for both ORR and OER. NGSHs were fabricated by in situ doping during chemical vapor deposition growth on layered double hydroxide derived bifunctional catalysts. Our one‐step approach not only provides simultaneous growth of graphene and SWCNTs, leading to the formation of three dimensional interconnected network, but also brings the intrinsic dispersion of graphene and carbon nanotubes and the dispersion of N‐containing functional groups within a highly conductive scaffold. Thus, the NGSHs possess a large specific surface area of 812.9 m 2 g −1 and high electrical conductivity of 53.8 S cm −1 . Despite of relatively low nitrogen content (0.53 at%), the NGSHs demonstrate a high ORR activity, much superior to two constituent components and even comparable to the commercial 20 wt% Pt/C catalysts with much better durability and resistance to crossover effect. The same hybrid material also presents high catalytic activity towards OER, rendering them high‐performance cheap catalysts for both ORR and OER. Our result opens up new avenues for energy conversion technologies based on earth‐abundant, scalable, noble‐metal‐free catalysts.