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Energies 2018, 11(12), 3356;

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

Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea
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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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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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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