Ruthenium Oxide-Based Microelectrochemical Devices: Electrochemical Behavior of the Oxide Formed by Reduction of RuO4(2-)
Abstract
Properties of macroscopic electrodes and arrays of closely spaced (1. 2 micro M) Au microelectrodes (approx. 2 micro M wide x 50 micro M long x 0.1 micro M high) coated with the oxide (RuOx) derived from reduction of RuO42- in 1 M NaOH are reported. XPS data show RuOx consists of a mixture of Ru oxidation states with significant amounts of RuIV. RuOx exhibits a well-defined cyclic voltammetric wave centered at Eredox = 0.0 vs. SSCE in pH 7.0 solution. The position, shape and area of the wave are insensitive to electrolyte composition, e.q. buffered solutions of LiCl, NaCl, CaCl2, (NH4)Cl, Na(ClO4) Na(OAc), Na(OTs) , or Na(phosphate). A pH dependence of 71 mV/pH unit from pH = 2 to pH = 14 is found for the position of this wave. UV-vis spectroelectrochemistry shows four broad absorption bands in reduced RuOx. Oxidation increases absorbance across the entire visible spectrum, but the data suggest that only a fraction of the RuOx is electroactive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1988
- Accession Number
- ADA199247
Entities
People
- Djonald F. Lyons
- James J Hickman
- Martin O. Schloh
Organizations
- Massachusetts Institute of Technology