Nanosheets Co3O4 interleaved with graphene for highly efficient oxygen reduction

Odedairo, Taiwo, Yan, Xuecheng, Ma, Jun, Jiao, Yalong, Yao, Xiangdong, Du, Aijun, & Zhu, Zhonghua (2015) Nanosheets Co3O4 interleaved with graphene for highly efficient oxygen reduction. ACS Applied Materials & Interfaces, 7(38), pp. 21373-21380.

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Abstract

Efficient yet inexpensive electrocatalysts for oxygen reduction reaction (ORR) are an essential component of renewable energy devices, such as fuel cells and metal-air batteries. We herein interleaved novel Co3O4 nanosheets with graphene to develop a first ever sheet-on-sheet heterostructured electrocatalyst for ORR, whose electrocatalytic activity outperformed the state-of-the-art commercial Pt/C with exceptional durability in alkaline solution. The composite demonstrates the highest activity of all the nonprecious metal electrocatalysts, such as those derived from Co3O4 nanoparticle/nitrogen-doped graphene hybrids and carbon nanotube/nanoparticle composites. Density functional theory (DFT) calculations indicated that the outstanding performance originated from the significant charge transfer from graphene to Co3O4 nanosheets promoting the electron transport through the whole structure. Theoretical calculations revealed that the enhanced stability can be ascribed to the strong interaction generated between both types of sheets.

Impact and interest:

7 citations in Scopus
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14 citations in Web of Science®

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ID Code: 87488
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/acsami.5b06063
ISSN: 1944-8252
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 American Chemical Society
Deposited On: 15 Sep 2015 23:34
Last Modified: 04 Oct 2016 05:10

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