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Title: Dual-Phase Spinel MnCo2O4 and Spinel MnCo2O4/Nanocarbon Hybrids for Electrocatalytic Oxygen Reduction and Evolution
Authors: Ge, Xiaoming
Liu, Yayuan
Goh, F. W. Thomas
Hor, T. S. Andy
Zong, Yun
Xiao, Peng
Zhang, Zheng
Lim, Suo Hon
Li, Bing
Wang, Xin
Liu, Zhaolin
Keywords: Oxygen evolution reaction
Covalent coupling
Oxygen reduction reaction
Transition-metal oxide
Metal-air battery
Issue Date: 2014
Source: Ge, X., Liu, Y., Goh, F. W. T., Hor, T. S. A., Zong, Y., Xiao, P., et al. (2014). Dual-Phase Spinel MnCo2O4 and Spinel MnCo2O4/Nanocarbon Hybrids for Electrocatalytic Oxygen Reduction and Evolution. ACS Applied Materials & Interfaces, 6(15), 12684-12691.
Series/Report no.: ACS Applied Materials & Interfaces
Abstract: Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential reactions for energy-storage and -conversion devices relying on oxygen electrochemistry. High-performance, nonprecious metal-based hybrid catalysts are developed from postsynthesis integration of dual-phase spinel MnCo2O4 (dp-MnCo2O4) nanocrystals with nanocarbon materials, e.g., carbon nanotube (CNT) and nitrogen-doped reduced graphene oxide (N-rGO). The synergic covalent coupling between dp-MnCo2O4 and nanocarbons effectively enhances both the bifunctional ORR and OER activities of the spinel/nanocarbon hybrid catalysts. The dp-MnCo2O4/N-rGO hybrid catalysts exhibited comparable ORR activity and superior OER activity compared to commercial 30 wt % platinum supported on carbon black (Pt/C). An electrically rechargeable zinc–air battery using dp-MnCo2O4/CNT hybrid catalysts on the cathode was successfully operated for 64 discharge–charge cycles (or 768 h equivalent), significantly outperforming the Pt/C counterpart, which could only survive up to 108 h under similar conditions.
ISSN: 1944-8244
DOI: 10.1021/am502675c
Schools: School of Chemical and Biomedical Engineering 
School of Materials Science & Engineering 
Rights: © 2014 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Applied Materials & Interfaces, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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