Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 5, 2012
Previous Article Next Article

Dual-electrode microfluidic cell for characterizing electrocatalysts

Author affiliations

Abstract

In this paper we introduce a microelectrochemical cell configured for generation-collection experiments and designed primarily for examining the kinetics of electrocatalysts. The heart of the device consists of two, closely spaced, pyrolyzed photoresist microband electrodes enclosed within a microchannel. The cell is suitable for evaluating the efficiency of electrocatalysts under an unprecedented range of conditions. Specifically, compared to the gold-standard rotating ring-disk electrode (RRDE), this device offers four major advantages. First, collection efficiencies of 97% are easily achieved, compared to values of 20–37% that are characteristic of RRDEs. Second, mass transfer coefficients of 0.5 cm s−1 are accessible for typical redox species, which is significantly higher than RRDEs (up to 0.01 cm s−1). Third, we show that the device can operate effectively at temperatures up to 70 °C, which is important for measuring electrochemical kinetics that are relevant to fuel cell catalysts. Finally, much less catalyst and much smaller volumes of electrolyte solution are required to make kinetic measurements using the microelectrochemical device compared to the RRDE. Here, we present the simple procedure used to fabricate the device, fundamental electroanalytical characterization, and electrocatalytic measurements relevant to the oxygen reduction reaction.

Graphical abstract: Dual-electrode microfluidic cell for characterizing electrocatalysts

Back to tab navigation

Supplementary files

Article information


Submitted
30 Nov 2011
Accepted
05 Jan 2012
First published
26 Jan 2012

Lab Chip, 2012,12, 986-993
Article type
Paper

Dual-electrode microfluidic cell for characterizing electrocatalysts

I. Dumitrescu, D. F. Yancey and R. M. Crooks, Lab Chip, 2012, 12, 986
DOI: 10.1039/C2LC21181E

Social activity

Search articles by author

Spotlight

Advertisements