Dodwell, J;
Maier, M;
Majasan, J;
Jervis, R;
Castanheira, L;
Shearing, P;
Hinds, G;
(2021)
Open-circuit dissolution of platinum from the cathode in polymer electrolyte membrane water electrolysers.
Journal of Power Sources
, 498
, Article 229937. 10.1016/j.jpowsour.2021.229937.
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Abstract
Platinum is the state-of-the-art catalyst for hydrogen evolution in polymer electrolyte membrane (PEM) water electrolysers; however, its stability has only been characterized to a limited extent in situ. This study measures platinum dissolving from the cathode during intermittent operation of a 3-electrode PEM electrolyser cell, using a differential pulse voltammetry technique that provided detection limits for platinum of less than 2 ng L−1. Water samples were periodically taken during on-off current cycling, and during periods of open-circuit voltage (OCV) platinum dissolution was detected when the cathode potential rose above 0.85 V NHE due to diffusion of oxygen from the anode. This reached a maximum dissolution rate at the highest cathode potential of 1.02 V NHE, and gradually decayed over a 90 h period. The average total amount of platinum dissolved per 90 h OCV period was estimated to be 152 ng cm−2 or 0.005% of the initial electrode catalyst mass. The dissolution mechanism was predicted to be the same as that occurring in PEM fuel cell cathodes, although being kinetically hindered in PEM electrolysers by the slow diffusion of oxygen from the anode to the cathode.
| Type: | Article |
|---|---|
| Title: | Open-circuit dissolution of platinum from the cathode in polymer electrolyte membrane water electrolysers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jpowsour.2021.229937 |
| Publisher version: | http://dx.doi.org/10.1016/j.jpowsour.2021.229937 |
| 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: | PEM water electrolyser, Differential pulse voltammetry, ICP-MS, Platinum dissolution, 3-Electrode cell, Accelerated stress test |
| 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10129570 |
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