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Research Article

Investigation of cubic Pt alloys for ammonia oxidation reaction

Yat Tung Chan, Kumar Siddharth, Minhua Shao( )
Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Abstract

As a promising fuel candidate, ammonia has been successfully used as anode feed in alkaline fuel cells. However, current technology in catalysts for ammonia electro-oxidation reaction (AOR) with respect to both cost and performance is inadequate to ensure large scale commercial application of direct ammonia fuel cells. Recent studies found that alloying Pt with different transition metals and controlling the morphology of catalysts can improve the AOR activity, and thus potentially can solve the cost issue. Herein, (100)-terminated Pt-M nanocubes (M = 3d-transition metals Fe, Co, Ni, Zn) are synthesized via wet-chemistry method and their catalytic activities toward AOR are evaluated. The addition of Fe, Co, Ni and Zn elements can enhance the AOR activity due to decrease in oxophilicity of platinum and bifunctional mechanism. Pt-Zn exhibits the maximum mass activity and specific activity with values of 0.41 A/mgPt and 1.69 mA/cm2 that are 1.6 and 1.8 times higher than Pt nanocubes, respectively. Pt-Fe, Pt-Co and Pt-Ni nanocubes also illustrate higher mass and specific activities compared to Pt nanocubes.

Keywords

ammonia oxidation reactionelectrocatalystsPt-3d transition metal nanocubesOH adsorption

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Nano Research
Volume 13 Issue 7,
July 2020
Pages 1920-1927
DOI: 10.1007/s12274-020-2712-1
Cite this article:
Chan YT, Siddharth K, Shao M. Investigation of cubic Pt alloys for ammonia oxidation reaction. Nano Research, 2020, 13(7): 1920-1927. https://doi.org/10.1007/s12274-020-2712-1
Topics:
Alkaline fuel cellsAmmoniaBinary alloysCatalyst activityCobalt alloysElectrocatalystsIron alloysOxidationPlatinum alloysTransition metalsZinc alloys
Part of a topical collection:
Sixth Nano Research Award

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Received: 10 December 2019
Revised: 13 January 2020
Accepted: 11 February 2020
Published: 29 February 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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