Anode and cathode overpotentials under accelerated stress testing of a PEM electrolysis cell

verfasst von

Alexander J. McLeod, Lena V. Bühre, Boris Bensmann, Omar E. Herrera, Walter Mérida

Abstract

An in-situ reference electrode was used under accelerated stress testing of a proton exchange membrane electrolysis cell. The reference electrode enabled the measurement of anodic and cathodic overpotentials. The accelerated stress test (dynamic load degradation) was conducted for over 1000 h, and it included half-cell measurements of the known anode and cathode potentials, repeated polarization curves, electron impedance spectroscopy and nano-scale imaging. The experiment had an average full-cell degradation rate of 77 μV/h. The anodic overpotential appears to be the main driver of the full-cell efficiency loss. The cathode EIS measurements indicate catalyst layer degradation despite minimal effect on the full-cell performance. The anodic EIS measurements yielded a resistance double that observed at the cathode. By simultaneously analyzing high frequency resistance, corrected half-cell polarization curves and half-cell EIS measurements, half-cell overpotentials can be attributed with greater confidence.

Organisationseinheit(en)

Institut für Elektrische Energiesysteme

Externe Organisation(en)

University of British Columbia

Typ

Artikel

Journal

Journal of power sources

Band

589

Anzahl der Seiten

9

ISSN

0378-7753

Publikationsdatum

01.01.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Erneuerbare Energien, Nachhaltigkeit und Umwelt, Energieanlagenbau und Kraftwerkstechnik, Physikalische und Theoretische Chemie, Elektrotechnik und Elektronik

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1016/j.jpowsour.2023.233750 (Zugang: Geschlossen)