Wu, Y;
Meyer, Q;
Liu, F;
Rasha, L;
Cho, JIS;
Neville, TP;
Millichamp, J;
... Brett, DJL; + view all
(2019)
Investigation of water generation and accumulation in polymer electrolyte fuel cells using hydro-electrochemical impedance imaging.
Journal of Power Sources
, 414
pp. 272-277.
10.1016/j.jpowsour.2019.01.003.
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Abstract
In-depth understanding of water management is essential for the optimization of the performance and durability of polymer electrolyte fuel cells (PEFCs). Neutron imaging of liquid water has proven to be a powerful diagnostic technique, but it cannot distinguish between ‘legacy’ water that has accumulated in the system over time and ‘nascent’ water recently generated by reaction. Here, a novel technique is introduced to investigate the spatially resolved water exchange characteristics inside PEFCs. Hydro-electrochemical impedance imaging (HECII) involves making a small AC-sinusoidal perturbation to a cell and measuring the consequential water generated, using neutron radiographs, associated with the stimulus frequency. Subsequently, a least-squares estimation (LSE) analysis is applied to derive the spatial amplitude ratio and phase shift. This technique provides a complementary view to conventional neutron imaging and provides information on the source and ‘history’ of water in the system. By selecting a suitable perturbation frequency, HECII can be used to achieve an alternative image ‘contrast’ and identify different features involved in the water dynamics of operational fuel cells.
| Type: | Article |
|---|---|
| Title: | Investigation of water generation and accumulation in polymer electrolyte fuel cells using hydro-electrochemical impedance imaging |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jpowsour.2019.01.003 |
| Publisher version: | https://doi.org/10.1016/j.jpowsour.2019.01.003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Neutron imaging, Polymer electrolyte fuel cell, Water management, Electro-hydrography |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10067618 |
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