In-situ and in-operando analysis of voltage losses using sense wires for proton exchange membrane water electrolyzers

JOURNAL OF POWER SOURCES

卷:481

Article

Kang, Zhenye¹  Alia, Shaun M.¹  Carmo, Marcelo²  Bender, Guido¹ 

[1] Natl Renewable Energy Lab NREL, Chem & Nanosci Ctr, Golden, CO 80401 USA

[2] Forschungszentrum Julich, Inst Energy & Climate Res IEK 14 Electrochem Proc, D-52425 Julich, Germany

关键词: Water electrolysis;    PEMEC;    Voltage sensing;    Loss contribution;    PTL resistance;    PTL coating;   

DOI  :  10.1016/j.jpowsour.2020.229012

来源: Elsevier

【 摘 要 】

Proton exchange membrane water electrolyzer development requires understanding processes at the materials and interface levels to reach the required performance and lifetime targets for increasing market penetration. To achieve the required progress, it is critical to develop advanced in-situ diagnostics that allow observation of the changes that come with the reduction of catalyst loading combined with long-term intermittent operation. This work presents an internal voltage sensing method that enables observing internal voltage drops in an operating electrolyzer cell. It allows the total cell resistance to be separated into anode, CCM, and cathode resistance. The method is demonstrated by operating cells with different anode porous transport layers (PTLs). The changing properties of the PTLs result in significant variations of the resistances. Enhancing the PTL properties with a protective coating reduces the anode resistance significantly. In addition to these observations, the method enables a real-time monitoring of resistance related values that impact performance in water electrolyzers. Longterm experiments with the method allow us to gain insights into processes that occur during operation such as conditioning or degradation. The internal voltage sensing method presented in this study is a novel technique for diagnosing, analyzing, and optimizing water electrolyzers and other energy conversion devices.

【 授权许可】

Free