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Enhanced mass activity and stability of bimetallic Pd-Ni nanoparticles on boron-doped diamond for direct ethanol fuel cell applications
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Date
2017-11-20
Authors
Mavrokefalos, Christos K.
Hasan, Maksudul
Rohan, James F.
Foord, John S.
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Publisher
John Wiley & Sons, Inc.
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Abstract
In this work, electrochemical deposition of Pd (palladium) and bimetallic Pd-Ni (nickel) nanoparticles on oxygen-terminated boron-doped diamond (BDD) substrate is described for use as electrocatalyst in direct ethanol fuel cell. A potentiostatic two-step electrochemical method involving the electrodeposition of Ni nanoparticles on BDD followed by mono-dispersed Pd nanoparticles was used for the fabrication of Pd-Ni/BDD electrode. The electrocatalytic activity of the bimetallic Pd-Ni nanoparticles was evaluated in an alkaline solution containing ethanol and compared to that of the Pd nanoparticles alone. The bimetallic Pd-Ni nanoparticles showed 2.4 times higher mass activity than the similar systems from literature as well as stability when operated in alkaline media. Higher electrochemical response towards the electrooxidation of ethanol observed for the bimetallic electrocatalysts was due to the synergistic effects of the electron interaction at the interface of the two metals. Chronopotentiometric measurements revealed that Pd is more stable when anchored to the Ni nanoparticles. The optimised loading of mono-dispersed Pd on a foreign Ni metal as nanoparticles plays a crucial role in achieving a high mass (3.63 x 106 mA/g) and specific (10.53 mA/cm2) electrocatalytic activity of Pd towards ethanol electrooxidation in alkaline media.
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Keywords
Diamond , Nanoparticles , Fuel cell , Palladium , Nickel
Citation
Mavrokefalos, C. K., Hasan, M., Rohan, J. F. and Foord, J. S. (2017) ‘Enhanced mass activity and stability of bimetallic Pd-Ni nanoparticles on boron-doped diamond for direct ethanol fuel cell applications’, ChemElectroChem, 5(3), pp. 455-463. doi:10.1002/celc.201701105
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© 2017, John Wiley & Sons, Inc. This is the peer reviewed version of the following article: Mavrokefalos, C. K., Hasan, M., Rohan, J. F. and Foord, J. S. (2017) ‘Enhanced mass activity and stability of bimetallic Pd-Ni nanoparticles on boron-doped diamond for direct ethanol fuel cell applications’, ChemElectroChem, 5(3), pp. 455-463, doi:10.1002/celc.201701105. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.