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Title: Boosting alkaline water electrolysis by asymmetric temperature modulation
Authors: Zhu, Qinpeng
Yang, Peihua
Zhang, Tao
Yu, Zehua
Liu, Kang
Fan, Hong Jin
Keywords: Science::Physics
Issue Date: 2021
Source: Zhu, Q., Yang, P., Zhang, T., Yu, Z., Liu, K. & Fan, H. J. (2021). Boosting alkaline water electrolysis by asymmetric temperature modulation. Applied Physics Letters, 119(1), 013901-.
Project: RG85/20
Journal: Applied Physics Letters
Abstract: Hydrogen production by water electrolysis is a sustainable and promising pathway to store surplus electricity from intermittent renewable energy. In conventional electrolyzers, hydrogen evolution and oxygen evolution reactions at the two electrodes run at the same temperature. In this work, we implement an asymmetric temperature modulation to enhance the water electrolysis rate in an alkaline solution. We revisit the thermodynamics of water electrolysis and determine by both simulations and experiments that the Gibbs free energy change required for alkaline water electrolysis under asymmetric temperature is lower than that under uniform average temperature. With the temperature difference of 40 K (possible for low-grade waste heat), the required voltage of asymmetric configuration decreases by 100 mV at the current density of 10 mA cm−2 compared to the system operated at the same average temperature. Moreover, the thermal efficiency reaches a maximum value of 7% under optimized operating current density. The asymmetric-temperature water electrolysis opens a promising way for utilization of low-grade heat.
ISSN: 0003-6951
DOI: 10.1063/5.0054273
Rights: © 2021 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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