Electrocatalytic Activity of Pd/Ir/Sn/Ta/TiO 2 Composite Electrodes

Jung Eun Park, Seung Kyu Yang, Ji Hyun Kim, Mi-Jung Park and Eun Sil Lee
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Jung Eun Park: Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea
Seung Kyu Yang: Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea
Ji Hyun Kim: Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea
Mi-Jung Park: WESCO electrode; Changwon-si, Gyeongsangnam-do 642370, Korea
Eun Sil Lee: Center for Plant Engineering, Institute for Advanced Engineering; Yongin-si 17180, Korea

Energies, 2018, vol. 11, issue 12, 1-9

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 H 2 SO 4 . 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 H 2 SO 4 , with a capacitance retention of 96% of its initial value. The accelerated life test results for the 8.6 g Pd-Ir-Sn-Ta/TiO 2 electrode showed a gradual slope with an efficiency of almost 100% at 1000 h in an aqueous solution of 3 M of H 2 SO 4 . 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/TiO 2 electrode demonstrated the optimum composition in 3 M of H 2 SO 4 for electrolyte refining.

Keywords: electrolyte refining; palladium-based electrode; mixed metal oxide; accelerated life test (ALT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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