Journal article
In situ distributed diagnostics of flowable electrode systems: resolving spatial and temporal limitations
Physical chemistry chemical physics : PCCP, v 16(34), pp 18241-18252
14 Sep 2014
PMID: 25055763
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
In this study, we have developed an in situ distributed diagnostics tool to investigate spatial and temporal effects in electrochemical systems based on flowable electrodes. Specifically, an experimental approach was developed that enables spatially-resolved voltage measurements to be obtained in situ, in real-time. To extract additional data from these distributed measurements, an experimentally-parameterized equivalent circuit model with a new 'flow capacitor' circuit element was developed to predict the distributions of various system parameters during operation. As a case study, this approach was applied to investigate the behavior of the suspension electrodes used in an electrochemical flow capacitor under flowing and static conditions. The volumetric capacitance is reduced from 15.6 F ml(-1) to 1.1 F ml(-1) under flowing conditions. Results indicate that the majority of the charging in suspension electrodes occurs within ∼750 μm of the current collectors during flow, which gives rise to significant state-of-charge gradients across the cell, as well as underutilization of the available active material. The underlying cause of this observation is attributed to the relatively high electrical resistance of the slurry coupled with a stratified charging regime and insufficient residence time. The observations highlight the need to develop more conductive slurries and to design cells with reduced charge transport lengths.
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Details
- Title
- In situ distributed diagnostics of flowable electrode systems: resolving spatial and temporal limitations
- Creators
- C R Dennison - Electrochemical Energy Systems Laboratory, Department of Mechanical Engineering and Mechanics, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, USA. eck32@drexel.eduY GogotsiE C Kumbur
- Publication Details
- Physical chemistry chemical physics : PCCP, v 16(34), pp 18241-18252
- Publisher
- Royal Society of Chemistry; England
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000341064600023
- Scopus ID
- 2-s2.0-84905842851
- Other Identifier
- 991014878175704721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical