Developing hierarchically porous MnOx/NC hybrid nanorods for oxygen reduction and evolution catalysis

Electrochemical oxygen reduction and evolution reactions (ORR and OER) play a vital role in the field of energy conversion and storage. The problem is that both processes are sluggish, requiring precious-metal catalysts. Here, starting from abundant precursors and using a simple synthesis approach,...

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Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2017, Vol.19 (12), p.2793-2797
Main Authors: Pandey, Jay, Hua, Bin, Ng, Wesley, Yang, Ying, van der Veen, Koen, Chen, Jian, Geels, Norbert J, Luo, Jing-Li, Rothenberg, Gadi, Yan, Ning
Format: Article
Language:English
Subjects:
Carbon
Catalysis
Catalysts
Electrodes
Evolution
Nanorods
Oxygen
Reduction
Online Access:Get full text
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Summary:Electrochemical oxygen reduction and evolution reactions (ORR and OER) play a vital role in the field of energy conversion and storage. The problem is that both processes are sluggish, requiring precious-metal catalysts. Here, starting from abundant precursors and using a simple synthesis approach, we report the preparation of a good bifunctional oxygen electro-catalyst: a composite nanorod of manganese oxides and nitrogen-doped carbon. This material has hierarchical porosity, facilitating the mass transfer within the electrode. The nitrogen-doped carbon forms contiguous 3D network, connecting the isolated MnOx nanoparticles and ensuring superior electrical conductivity. Importantly, the MnOx particles contain manganese of mixed oxidation states; aligned with the nitrogen-doped carbon, this hybrid is among the best non-noble-metal ORR/OER catalysts in alkaline media, outperforming even Pt and RuO2 catalysts.
ISSN:1463-9262
1463-9270
DOI:10.1039/c7gc00147a