Abstract
Investigations on configurations and properties of the electrode in the membrane electrode assembly (MEA) of an electrolyzer using an anion exchange membrane (AEM) were performed based on an experimental study using a small single electrolysis cell. First, two different configurations of the catalyst layer (CL) for the MEA were prepared using commercially available materials: a catalyst-coated membrane (CCM) and a catalyst-coated substrate (CCS). Experimental electrolysis results revealed that the electrode configuration appropriate for the MEA of AEM electrolyzers is CCM-cathode and CCS-anode. Then, the effect of electrode properties (catalyst loading and binder content in CLs) on electrolysis performance was examined experimentally, revealing an optimal range of catalyst loading and binder content.
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Abbreviations
- \(i\) :
-
Current density, A cm− 2
- \({R_{{\text{cell}}}}\) :
-
Ohmic resistance of cell, Ω cm2
- \({T_{{\text{cell}}}}\) :
-
Cell temperature, K (°C)
- t :
-
Time, sec (min)
- \({V_{{\text{cell}}}}\) :
-
Cell voltage, V
- \({w_{{\text{cat\_A}}}}\) :
-
Catalyst loading in anode catalyst layer, mg cm− 2
- \({w_{{\text{cat\_C}}}}\) :
-
Catalyst loading in cathode catalyst layer, mg cm− 2
- \({\omega _{\text{i}}}\) :
-
Ionomer (binder) content in catalyst layer formed by catalyst-coated membrane, wt%
- \({\omega _{\text{P}}}\) :
-
Polytetrafluoroethylene (binder) content in catalyst layer formed by catalyst-coated substrate, wt%
- AEM:
-
Anion exchange membrane
- AFC:
-
Alkaline fuel cell
- CCM:
-
Catalyst-coated membrane
- CCS:
-
Catalyst-coated substrate
- CL:
-
Catalyst layer
- GDL:
-
Gas diffusion layer
- HER:
-
Hydrogen evolution reaction
- IEC:
-
Ion exchange capacity
- IPA:
-
Isopropyl alcohol
- MEA:
-
Membrane electrode assembly
- NHE:
-
Normal hydrogen electrode
- OER:
-
Oxygen evolution reaction
- OPE:
-
Octylphenol ethoxylate
- PEM:
-
Proton exchange membrane
- PEMFC:
-
Proton exchange membrane fuel cell
- PFA:
-
Perfluoroalkoxy alkane
- PGM:
-
Platinum-group metals
- PTFE:
-
Polytetrafluoroethylene
- RES:
-
Renewable energy sources
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Acknowledgements
The authors gratefully acknowledge the financial support from the Japan Society for the Promotion of Science (JSPS) through the Grants-in-Aid for Scientific Research (KAKENHI)—Grant Number JP17K05970. The authors wish to express their gratitude to Tokuyama Corporation for their helpful advice. The authors also thank Mr. Akira Takatsuki (AIST) for his SEM expertise.
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Ito, H., Miyazaki, N., Sugiyama, S. et al. Investigations on electrode configurations for anion exchange membrane electrolysis. J Appl Electrochem 48, 305–316 (2018). https://doi.org/10.1007/s10800-018-1159-5
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DOI: https://doi.org/10.1007/s10800-018-1159-5