Use of Zr/ZrO2 as a counter electrode for the minimization of loss reactions in single-compartment electrolysis cells

Christos Comninellis
1995
Conference paper

The use of ZrO2 membrane on counter electrodes (e.g. Zr) is proposed for controlling the mass transfer rates to the electrode and therefore the extent of possible loss reactions. A comparative study was undertaken to examine the influence of the prepn. technique of the Zr/ZrO2 electrode on its electrochem. properties using the Ce(IV)/Ce(III) redox couple as test reaction. The obtained results showed that the rate of Ce(IV) redn. is strongly decreased on Zr/ZrO2 cathodes, prepd. by the thermal oxidn. of metallic Zr. A model is also proposed for the quasi-divided operation mode, where the counter electrode is covered with an inorg. membrane (ZrO2). Such electrochem. reactors offer an effective alternative to the traditional divided electrochem. reactor. [on SciFinder (R)]

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Christos Comninellis
1995
Conference paper

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https://infoscience.epfl.ch/record/79791?ln=en

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Enhancing Mass Transport in Redox Flow Batteries by Tailoring Flow Field and Electrode Design

Christopher Raymond Dennison

In this study, we investigate the mass transport effects of various flow field designs paired with raw and laser perforated carbon paper electrodes in redox flow batteries (RFBs). Previously, we observed significant increases in peak power density and limiting current density when perforated electrodes were used in conjunction with the serpentine flow field. In this work, we expand on our earlier findings by investigating various flow field designs (e.g., serpentine, parallel, interdigitated, and spiral), and continuously measuring pressure drop in each configuration. In all cases, these perforated electrodes are found to be associated with a reduction in pressure drop from 4% to 18%. Flow field designs with a continuous path from inlet to outlet (i.e., serpentine, parallel, spiral) are observed to exhibit improved performance (up to 31%) when paired with perforated electrodes, as a result of more facile reactant delivery and resulting greater utilization of the available surface area. Conversely, flow fields with discontinuous paths which force electrolyte to travel through the electrode (e.g. interdigitated), are adversely affected by the creation of perforations due to the high permeability 'channels' in the electrode. These results demonstrate that mass transport can significantly limit the performance of RFBs with carbon paper electrodes. (C) 2015 The Electrochemical Society. All rights reserved.

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