RGB video electrochemistry of copper electrodeposition/electrodissolution in acid media on a ternary graphite:copper:polypropylene composite electrode

Kinetics of Surface Chemical Reactions from a Digital Video

“…Figure shows a schema of the experimental setup needed to obtain valuable data from the video during a surface chemical process. More details about how to obtain and how to manage surface video data can be consulted in recent works. − …”

“…A digital video takes advantage of a fast image acquisition ratefrom 30 frames per second (fps) in the less expensive cameras to thousands of fps in ultra-high speed camerasto unravel fast chemical processes taking place on the studied surface. − Each acquired image is decomposed into individualized pixels characterized by red, green, and blue intensities coordinates ( I R , I G , and I B ). As an example, in a classical 24-bit digital image, the color intensity for each color has an 8 bits resolution.…”

“…As it has already been proven, the color intensities recorded at each point on the surface and at any time makes possible the spatiotemporal study of the system . In these cases, the analysis of the electrochemical response at different sites on the electrode surface would be very interesting and useful but the measure of local currents at localized points on the surface proves very difficult. − Video-electrochemistry might solve some of the said problems. , We have observed that the ohmic drop along the electrode surface causes different electrochemical reaction rates ,− or in other cases, the diffusion through the surface could control the rate of chemical reactions …”

Digital video electrochemistry (DVEC) applied to the study of Prussian Blue films

“…DVEC shows promising possibilities for the characterization of the electrode surface processes as the quality of Cu layers by electroplating on non‐homogeneous electrodes, [30] the surface characterization of electrochromic materials on resistive materials [28] or determination of half‐life time of electrochemical reactions [25,26] …”

“…[26] However, it proves difficult obtaining a good correlation between color intensities and absorbance values since color intensities allows obtaining spectroelectrochemical information, but not absorbance values which could be easily related with concentration. [29] DVEC shows promising possibilities for the characterization of the electrode surface processes as the quality of Cu layers by electroplating on non-homogeneous electrodes, [30] the surface characterization of electrochromic materials on resistive materials [28] or determination of half-life time of electrochemical reactions. [25,26] It is also known that PB films can catalyze different electrochemical processes such as the O 2 reduction.…”