Direct visualization of electrochemical reactions and comparison of commercial carbon papers in operando by fluorescence microscopy using a quinone-based flow cell

Andrew A. Wong, Michael J. Aziz, Shmuel M. Rubinstein

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

24 Scopus citations

Abstract

We demonstrate the use of fluorescence microscopy as a tool for mapping the spatial distribution of fluid flow and electrochemical reactions in an operating aqueous quinone flow cell. 9, 10-anthraquinone-2, 7-disulfonic acid (AQDS) is a reversibly redox active molecule with a reduced form (H2AQDS) that fluoresces when excited by UV light. Visualization of AQDS/H2AQDS within commercial porous carbon electrode papers enables a direct quantitative comparison of their performance. In particular, this technique illuminates surprisingly large-scale heterogeneous fluid flow profiles present in several carbon papers, leaving substantial areas of the electrode mass-transport limited. In others, more homogeneous flow distribution is observed, but limitations such as low electronic conductivity and limited accessible electrode surface area limit the performance. These observations provide insights into improving structural properties of porous electrodes for high-power density electrochemical flow cells.

Original languageAmerican English
Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PublisherElectrochemical Society Inc.
Pages153-161
Number of pages9
Edition11
ISBN (Electronic)9781607688174
ISBN (Print)9781623324605
DOIs
StatePublished - 2017
Externally publishedYes
Event231st ECS Meeting - New Orleans, United States
Duration: 28 May 20171 Jun 2017

Publication series

NameECS Transactions
Number11
Volume77
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference231st ECS Meeting
Country/TerritoryUnited States
CityNew Orleans
Period28/05/171/06/17

Bibliographical note

Publisher Copyright:
© 2017 The Electrochemical Society.

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