Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

Su, Chao, Yang, Tao, Zhou, Wei, Wang, Wei, Xu, Xiaomin and Shao, Zongping (2016) Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions. Journal of Materials Chemistry A, 4 12: 4516-4524. doi:10.1039/c5ta10492k


Author Su, Chao
Yang, Tao
Zhou, Wei
Wang, Wei
Xu, Xiaomin
Shao, Zongping
Title Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions
Formatted title
Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7488
2050-7496
Publication date 2016-02-01
Sub-type Article (original research)
DOI 10.1039/c5ta10492k
Open Access Status DOI
Volume 4
Issue 12
Start page 4516
End page 4524
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
Oxygen reduction and evolution reactions (ORR and OER) are of prime importance for many energy conversion and storage devices, such as regenerative fuel cells and rechargeable metal–air batteries. However, the sluggish kinetics of the ORR and OER strongly limit the efficiency and performance of these electrochemical systems and jeopardize the route of commercialization. Therefore, the design and development of bifunctional electrocatalysts with high activity for both the ORR and OER is challenging but urgent and crucial. Here, we took advantage of Pt/C and LiCoO2 with outstanding ORR activity and high intrinsic OER activity, respectively, to develop a composite material with ultralow Pt loading as a bifunctional catalyst for the ORR and OER in alkaline media. This catalyst was fabricated via simple ultrasonic mixing, exhibiting superb electrocatalytic activity and good stability. Its ORR activity is comparable to that of the commercial Pt/C catalyst and its OER activity is better than that of single LiCoO2, owing to the synergetic effect between Pt and LiCoO2, which has been demonstrated through the X-ray photoelectron spectroscopy (XPS) characterisation technique. Remarkably, surprisingly high ORR mass activity (2.04 A mgPt−1 at 0.8 V vs. RHE) and enhanced bifunctionality (ΔE = 0.91 V) were obtained for the Pt–LiCoO2 composite catalyst with a mass ratio of 1 : 49 for Pt/LiCoO2. Our work opens up a new track to exploit highly efficient catalysts with reduced consumption of Pt, meanwhile maintaining the optimal catalytic activity and durability.
Keyword Catalytic water oxidation
Temperature electrochemical devices
Bi-functional electrocatalysts
Lithium cobalt oxide
Ring-disk electrode
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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