Interconnected core-shell carbon nanotube-graphene nanoribbon scaffolds for anchoring cobalt oxides as bifunctional electrocatalysts for oxygen evolution and reduction

Xunyu Lu, Hubert M. Chan, Chia Liang Sun, Chuan Ming Tseng, Chuan Zhao*

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

57 引文 斯高帕斯(Scopus)

摘要

Bifunctional electrocatalysts for oxygen evolution reactions (OER) and oxygen reduction reactions (ORR) are crucial to the development of regenerative fuel cells or rechargeable metal-air batteries. However, the sluggish kinetics of OER and ORR often require the use of precious metal-based catalysts such as iridium, ruthenium, and platinum to lower the energy barriers of OER and ORR. Developing a highly efficient and stable bifunctional catalyst that is made of non-precious elements for ORR and OER still remains a significant challenge. Here, we show a novel catalyst architecture based on coupling non-precious Co3O4 nanocrystals onto nitrogen-doped, core-shell structured carbon nanotube-graphene nanoribbon (N-csCNT-GNR) scaffolds prepared by microwave-assisted, controlled upzipping of multiwall carbon nanotubes. The unzipped graphene nanoribbon shell enables a high surface area for loading of Co3O4 nanocrystals while the intact inner carbon nanotube core facilitates efficient transport of electrons. The as-prepared Co3O4/N-csCNT-GNR composite catalysts exhibit remarkably high activity towards both OER and ORR as a result of synergistic interactions between Co3O4 and the N-csCNT-GNR substrates.

原文英語
頁(從 - 到)13371-13376
頁數6
期刊Journal of Materials Chemistry A
3
發行號25
DOIs
出版狀態已出版 - 07 07 2015

文獻附註

Publisher Copyright:
© The Royal Society of Chemistry.

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