Abstract
We present an advanced multimodality characterization platform for simultaneous optical and electrochemical measurements of ferrocyanides. Specifically, we combined a fiber-optic Fabry–Perot interferometer with a three-electrode electrochemical setup to demonstrate a proof-of-principle of this hybrid characterization approach, and obtained feasibility data in its monitoring of electrochemical reactions in a boron-doped diamond film deposited on a silica substrate. The film plays the dual role of being the working electrode in the electrochemical reaction, as well as affording the reflectivity to enable the optical interferometry measurements. Optical responses during the redox reactions of the electrochemical process are presented. This work proves that simultaneous opto-electrochemical measurements of liquids are possible.
Highlights
Due to the water-based nature of the chemical solution, the optical measurements were performed with the use of the light source operating at 1550 nm
The fiber that played the role of an optical measurement head was stripped and cleaved to fit the measurement field
The incident beam is guided through the optical fiber and spitted onto a reference beam and a measurement beam
Summary
After the chemical vapor deposition process, the samples were cleaned in a solution of H2SO4 and KNO3 with a 2:1 weight ratio. The solution was heated until it reached its boiling point. The electrodes were placed in the boiling solution for 30 min and subsequently placed in the boiling deionized water. The electrodes were ultra-sonicated in isopropyl alcohol and deionized water for 10 min. Boron-doped diamond was hydrogenated in the previously mentioned system
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