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Energies 2018, 11(12), 3356; https://doi.org/10.3390/en11123356

Electrocatalytic Activity of Pd/Ir/Sn/Ta/TiO2 Composite Electrodes

1
Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea
2
WESCO electrode; Changwon-si, Gyeongsangnam-do 642370, Korea
*
Author to whom correspondence should be addressed.
Received: 6 November 2018 / Revised: 26 November 2018 / Accepted: 27 November 2018 / Published: 30 November 2018
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Abstract

This study compared the electrolytic refining process using different commercial Pd-based electrodes. The Pd-based electrode had an Ir:Sn molar ratio of 1:1 and contained 10% tantalum on a titanium substrate. The palladium weight ratio varied from 0 g to 1.8 g, 4.7 g, 8.6 g, and 15.4 g. Electrolytic refining was investigated for the Pd-based electrode in 3 M of H2SO4. The interfacial microstructure and components of the substrate were investigated using energy-dispersive X-ray analysis, and the electrochemical properties of the materials were measured using cyclic voltammetry, linear scan voltammetry, electrochemical impedance spectroscopy, and accelerated life tests. Of all the tested Pd-based electrodes, those with a palladium loading weight of 8.6 g showed the highest and most stable electrode activity at 3 M of H2SO4, with a capacitance retention of 96% of its initial value. The accelerated life test results for the 8.6 g Pd-Ir-Sn-Ta/TiO2 electrode showed a gradual slope with an efficiency of almost 100% at 1000 h in an aqueous solution of 3 M of H2SO4. After the test, the dissolved elements that caused resistance in the electrolyte increased with increasing palladium loading content. Thus, the 8.6 g Pd-Ir-Sn-Ta/TiO2 electrode demonstrated the optimum composition in 3 M of H2SO4 for electrolyte refining. View Full-Text
Keywords: electrolyte refining; palladium-based electrode; mixed metal oxide; accelerated life test (ALT) electrolyte refining; palladium-based electrode; mixed metal oxide; accelerated life test (ALT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Park, J.E.; Yang, S.K.; Kim, J.H.; Park, M.-J.; Lee, E.S. Electrocatalytic Activity of Pd/Ir/Sn/Ta/TiO2 Composite Electrodes. Energies 2018, 11, 3356.

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