Citation: Pei Fang LIU, Jun Tao LU, Jia Wei YAN. Unique Nafion-Os(bpy3²⁺ Modified Electrodes[J]. Chinese Chemical Letters, ;1999, 10(10): 857-860. shu

Unique Nafion-Os(bpy3²⁺ Modified Electrodes

Department of Chemistry Wuhan University Wuhan 430072

Received Date: 15 February 1999

It was newly found that the electrodes modified by applying ethanol solutions of Nation containing Os(bpy)₃²⁺ onto the substrate electrode (the one=step method) show two pairs of stable redox peaks of Os(bpy)₃^2+/3+ on cyclic voltammogram near 0.54V and 0.25V, respectively. These modified electrodes can effectively mediate and catalyze the first and second steps of nitrite reduction in acidic media in the potential region 0-0.9V when the loading in the coating (X=Γ(Os²⁺)/Γ(S0₃⁺)) and pH in solution are below 0.17 and 4, respectively. When X is between 0.33 and 0.17, only the current peak near 0.54V appears regardless of solution pH and only the first step of NO²⁺ reduction is catalyzed. Thus the modified electrode provides a very useful flexibility that one can control the reaction pathway and catalytic activity of nitrite reduction by simply changing the concentration of the mediator in the coating.
- Chemically modified electrodes,
- nitrite reduction,
- electro-catalysis,
- sensors
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