High performance bifunctional electrocatalytic activity of a reduced graphene oxide-molybdenum oxide hybrid catalyst

Sundaram Chandrasekaran, Eui Jung Kim, Jin Suk Chung, Chris R. Bowen, Balasubramaniyan Rajagopalan, Vaia Adamaki, R. D. K. Misra, Seung Hyun Hur

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The advances in cost effective, highly active and stable electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) remain the major issues for the commercialization of metal air-batteries and alkaline fuel cells. In this aspect, a facile hydrothermal route was developed to prepare nonprecious metal electrocatalysts including pristine MoO3 rods, nanospheres, and their hybrids with reduced graphene oxide (rGO). This is the first report of the use of rGO coupled with hexagonal MoO3 nanocrystals that act as both ORR and OER catalysts. The rGO-MoO3 sphere hybrid catalyst exhibited excellent catalytic activity toward both the ORR and OER compared to pristine MoO3 rods, MoO3 spheres and rGO-MoO3 rods. In addition, the rGO-MoO3 nanosphere hybrid exhibited excellent catalytic activity, long-term durability, and CO tolerance compared to a high quality commercial Pt/C catalyst. This makes the GMS hybrid composite a highly promising candidate for high-performance non-precious metal-based bi-functional electrocatalysts with low cost and high efficiency for electrochemical energy conversion. The enhanced activity of the rGO-MoO3 nanosphere hybrid is due mainly to the enhanced structural openness in the tunnel structure of the hexagonal MoO3 when it is coupled with rGO.

LanguageEnglish
Pages13271-13279
Number of pages9
JournalJournal of Materials Chemistry A
Volume4
Issue number34
DOIs
StatusPublished - 16 Sep 2016

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Molybdenum oxide
Graphite
Oxides
Graphene
Catalysts
Oxygen
Nanospheres
Electrocatalysts
Metals
Catalyst activity
Alkaline fuel cells
Carbon Monoxide
Energy conversion
Nanocrystals
Costs
Fuel cells
Tunnels
Durability
Composite materials
Air

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High performance bifunctional electrocatalytic activity of a reduced graphene oxide-molybdenum oxide hybrid catalyst. / Chandrasekaran, Sundaram; Kim, Eui Jung; Chung, Jin Suk; Bowen, Chris R.; Rajagopalan, Balasubramaniyan; Adamaki, Vaia; Misra, R. D. K.; Hur, Seung Hyun.

In: Journal of Materials Chemistry A, Vol. 4, No. 34, 16.09.2016, p. 13271-13279.

Research output: Contribution to journalArticle

Chandrasekaran, S, Kim, EJ, Chung, JS, Bowen, CR, Rajagopalan, B, Adamaki, V, Misra, RDK & Hur, SH 2016, 'High performance bifunctional electrocatalytic activity of a reduced graphene oxide-molybdenum oxide hybrid catalyst', Journal of Materials Chemistry A, vol. 4, no. 34, pp. 13271-13279. https://doi.org/10.1039/c6ta05043c
Chandrasekaran, Sundaram ; Kim, Eui Jung ; Chung, Jin Suk ; Bowen, Chris R. ; Rajagopalan, Balasubramaniyan ; Adamaki, Vaia ; Misra, R. D. K. ; Hur, Seung Hyun. / High performance bifunctional electrocatalytic activity of a reduced graphene oxide-molybdenum oxide hybrid catalyst. In: Journal of Materials Chemistry A. 2016 ; Vol. 4, No. 34. pp. 13271-13279.
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