A universal and facile way for the development of superior bifunctional electrocatalysts for oxygen reduction and evolution reactions utilizing the synergistic effect

Zhu, Yinlong, Su, Chao, Xu, Xiaomin, Zhou, Wei, Ran, Ran and Shao, Zongping (2014) A universal and facile way for the development of superior bifunctional electrocatalysts for oxygen reduction and evolution reactions utilizing the synergistic effect. Chemistry - A European Journal, 20 47: 15533-15542. doi:10.1002/chem.201403192


Author Zhu, Yinlong
Su, Chao
Xu, Xiaomin
Zhou, Wei
Ran, Ran
Shao, Zongping
Title A universal and facile way for the development of superior bifunctional electrocatalysts for oxygen reduction and evolution reactions utilizing the synergistic effect
Journal name Chemistry - A European Journal   Check publisher's open access policy
ISSN 1521-3765
0947-6539
Publication date 2014-11-17
Year available 2014
Sub-type Article (original research)
DOI 10.1002/chem.201403192
Open Access Status
Volume 20
Issue 47
Start page 15533
End page 15542
Total pages 10
Place of publication Weinheim, Germany
Publisher Wiley - VCH Verlag
Collection year 2015
Language eng
Formatted abstract
Increasing energy demands have stimulated intense research activities on reversible electrochemical conversion and storage systems with high efficiency, low cost, and environmental benignity. It is highly challenging but desirable to develop efficient bifunctional catalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). A universal and facile method for the development of bifunctional electrocatalysts with outstanding electrocatalytic activity for both the ORR and OER in alkaline medium is reported. A mixture of Pt/C catalyst with superior ORR activity and a perovskite oxide based catalyst with outstanding OER activity was employed in appropriate ratios, and prepared by simple ultrasonic mixing. Nanosized platinum particles with a wide range of platinum to oxide mass ratios was realized easily in this way. The as-formed Pt/C–oxide composites showed better ORR activity than a single Pt/C catalyst and better OER activity than a single oxide to bring about much improved bifunctionality (ΔE is only ≈0.8 V for Pt/C–BSCF; BSCF=Ba0.5Sr0.5Co0.8Fe0.2O3−δ), due to the synergistic effect. The electronic transfer mechanism and the rate-determining step and spillover mechanism were two possible origins of such a synergistic effect. Additionally, the phenomenon was found to be universal, although the best performance could be reached at different platinum to oxide mass ratios for different oxide catalysts. This work thus provides an innovative strategy for the development of new bifunctional electrocatalysts with wide application potentials in high-energy and efficient electrochemical energy storage and conversion.
Keyword Carbon
Electrochemistry
Oxygen
Reduction
Platinum
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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