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N-Ethylcarbazole-Modified Poly(terphenyl piperidinium) Membranes and Systematic Membrane Electrode Assembly Optimization for High-Performance Alkaline Water Electrolysis
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DOI：10.1021/acsaem.6c00976.png)
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Abstract
En 中文
Anion exchange membrane water electrolysis (AEMWE) is critical for green hydrogen production, and its performance is tightly linked to membrane intrinsic properties and system-level optimization. Herein, N-ethylcarbazole-modified polyarylpiperidine anion exchange membranes (PCTP-x) were synthesized via superacid-catalyzed condensation, with PCTP-10 (containing 10% N-ethylcarbazole) showing 63 mS cm−1 (20 °C) and 120 mS cm−1 (80 °C) OH– conductivity. To boost AEMWE performance, systematic membrane electrode assembly (MEA) fabrication optimization was implemented, encompassing three key strategies: adoption of the catalyst-coated substrate (CCS) method to minimize interfacial resistance, design of an asymmetric anode−cathode gasket thickness configuration, and selection of 80 °C as the operating temperature to enhance ionic conductivity. Under these conditions, PCTP-10-based AEMWE achieved 2000 mA cm−2 at 1.9 V, outperforming the reference PTP system (1600 mA cm−2). The PCTP-10 MEA also exhibited good stability, with a voltage decay rate of 0.45 mV h−1 over 350 h of operation. This study highlights the critical role of systematic MEA fabrication optimization in boosting the performance of AEMWE technologies for efficient green hydrogen production.
Keywords:
Electrodes
Electrolysis
Ion exchange
Membranes
Thermodynamic properties
N-ethylcarbazole
ionic conductivity
alkaline stability
sealing gaskets
water electrolyzers
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5.5
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1.1W
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4.5W
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