Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation
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Accepted Version
Date
2017-05-08
Authors
Mavrokefalos, Christos K.
Hasan, Maksudul
Khunsin, Worawut
Schmidt, Michael
Maier, Stefan A.
Rohan, James F.
Compton, Richard G.
Foord, John S.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
The modification of hydrogen terminated boron-doped diamond (HBDD) electrode with pure palladium (Pd) and Pd-Sn (tin) nanoparticles is described in this study. For synthesis of Sn/HBDD and Pd-Sn/HBDD electrode, a potentiostatic two-step electrochemical method involving the electrodeposition of Sn followed by Pd was used, respectively. The modification of the HBDD electrode with Sn and noble metal Pd by forming bimetallic Pd-Sn nanoparticle leads to a higher electrocatalytic activity. The electrocatalytic activity of the bimetallic Pd-Sn nanoparticles was evaluated towards the electrooxidation of ethanol in alkaline media and compared with that of the Pd nanoparticles alone. The bimetallic Pd-Sn nanoparticles modified HBDD electrode exhibits higher current densities and less poisoning effects during ethanol electrooxidation compared to Pd/HBDD. The proper tuning of the Pd loading on a foreign metal along with the surface termination effects of the BDD electrode plays a crucial role in achieving a high mass (4.26×106mA/g) and specific (12.37mA/cm2) electrocatalytic activity of Pd towards ethanol electrooxidation. The aforementioned catalysts of this research possess a high poisoning resistance (If/Ib=1.63) and stability towards ethanol electrooxidation in alkaline media.
Description
Keywords
Diamond , Ethanol , Palladium , Tin , Nanoparticles
Citation
Mavrokefalos, C. K., Hasan, M., Khunsin, W., Schmidt, M., Maier, S. A., Rohan, J. F., Compton, R. G. and Foord, J. S. (2017) 'Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation', Electrochimica Acta, 243, pp. 310-319. doi: 10.1016/j.electacta.2017.05.039