期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 42, 期 52, 页码 30493-30508出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.10.112
关键词
Hydrogen production; Differential high pressure electrolysis; Proton exchange membrane (PEM) water electrolysis; Asymmetric water electrolysis; Modular electrolysis
资金
- Klima-und Energiefond
- Austrian Research Promotion Agency [843920]
- project consortium OMV Gas Power GmbH
- Energy Institute at the Johannes Kepler University Linz
- Fronius International GmbH
- EVN AG
In this paper a semi-empiric zero-dimensional steady state simulation model of an asymmetric high pressure proton exchange membrane water electrolyser is being presented. Based on experimental investigations on a 9.6 kW asymmetric high pressure water electrolysis module, empirical parameters were determined. Measurements were taken by varying the production pressure between 70 bar and 155 bar, the process temperature between 45 degrees C and 75 degrees C and the current density from 0.81 A cm(-2) to 1.85 A cm(-2). Stack efficiency and hydrogen diffusion from the cathode to the anode side were determined and expressed by the faradaic efficiency. Stack efficiencies of up to 74.8% were achieved at 0.81 A cm(-2), 75 degrees C and 155 bar. As expected the stack efficiency decreases with increasing hydrogen production pressure. A temperature decrease of 30 degrees C has greater impact on the efficiency than an increase of pressure from 70 to 155 bar. The faradaic efficiency at 1.85 A cm(-2),155 bar and 45 degrees C is higher than 99% and even at a high operating temperature of 75 degrees C higher than 97%. The presented model can be used for prediction of the stack voltage, gas production flow rates, water consumption and stack efficiency as function of input current, process temperature and production pressure. Results show a very satisfactory consistency of measurement and simulation. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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