Iridium-Based Hexacyanometallate Thin Films in Aqueous Electrolytes: Some Of Their Electrochemical and Catalytic Behaviours

By Kasem K. Kasem; Leslie Huddleston

doi:10.1595/003214004X484159167

ISSN: 0032-1400

oa Iridium-Based Hexacyanometallate Thin Films in Aqueous Electrolytes

Some Of Their Electrochemical and Catalytic Behaviours
Authors: By Kasem K. Kasem¹ and Leslie Huddleston¹
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Affiliations: ¹ Department of Natural, Mathematical and Information SciencesIndiana University Kokomo, Kokomo, IN 46904-9003, U.S.A.
Source: Platinum Metals Review, Volume 48, Issue 4, Oct 2004, p. 159 - 167
DOI: https://doi.org/10.1595/003214004X484159167
- Published online: 01 Jan 2004

Abstract

Thin films of metal-hexacyanoiridium(III) (MHCI), KxMy[Ir(CN)6]z, where M = Ru, Fe were electrochemically prepared and used as surface modifiers for glassy carbon electrodes. The redox behaviour of the counter/central ions of these films was investigated in aqueous electrolytes using cyclic voltammetry, chronocoulometry and electrochemical impedance spectroscopy. An electrochemical synthesis of zeolite-like films of KxMy[Ir(CN)6]z and KxFey[Fe(CN)6]z (Prussian blue) was also undertaken using the cyclic voltammetric technique. Porous multifilm assemblies of Prussian blue and MHCI were formed either by the direct electrodeposition of Prussian blue over MHCI or Prussian blue over MHCI during repetitive potential cycling, or by electrochemically-driven insertion-substitution methods. In acidic aqueous KCl, iron hexacyano iridate (FeHCI) displays two redox waves with formal potential E^of ≈, 0.35 and 0.6 V vs. Ag/AgCl. The electrochemical behaviour of FeHCI was compared with that of related hexacyanometallate compounds, such as KRux[Ru(CN)6]y, KRux[Fe(CN)6]yand KFex[Fe(CN)6]y. In addition, evidence for the catalytic behaviour of MHCIfilms towards the reduction of iodate, IO3^-, is reported.

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/content/journals/10.1595/003214004X484159167

Iridium-Based Hexacyanometallate Thin Films in Aqueous Electrolytes

Platinum Metals Review 48, 159 (2004); https://doi.org/10.1595/003214004X484159167

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Article Type: Research Article

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oa Iridium-Based Hexacyanometallate Thin Films in Aqueous Electrolytes

Some Of Their Electrochemical and Catalytic Behaviours

Abstract

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