Design and characterization of compact proton exchange membrane water electrolyzer for component evaluation test

Ishida, Taiki; Kashiwagi, Hayato; Sano, Yoh; Mitsushima, Shigenori

doi:10.1016/j.ijhydene.2021.08.213

Cited by 30 publications

(26 citation statements)

References 31 publications

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“…Water electrolysis evaluation was conducted using two types of electrolysis cells: flow‐ and batch‐type cells. The flow type single electrolysis cell (standard electrolyzer for component evaluation test, YNU cell) consisted of a carbon cathode plate with a flow channel, gasket with a hole for MEA (a square‐shaped area of 1 cm 2 ), and a Ti anode plate with a flow channel 6 . The compression pressure was set to 0.5 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…A platinum (0.5 mg/cm gasket with a hole for MEA (a square-shaped area of 1 cm 2 ), and a Ti anode plate with a flow channel. 6 The compression pressure was set to 0.5 MPa. A Ag/AgCl electrode was selected as the reference electrode in the flow-type cell.…”

Section: Electrodesmentioning

confidence: 99%

“…Two major models of water electrolysis, alkaline water electrolysis (AWE) and proton exchange membrane water electrolysis (PEMWE), have been actively studied and put to practical use 2–8 . The major difference between the two systems is their electrolytes, which transport ions to undergo electrochemical reactions at the electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…2 Two major models of water electrolysis, alkaline water electrolysis (AWE) and proton exchange membrane water electrolysis (PEMWE), have been actively studied and put to practical use. [2][3][4][5][6][7][8] The major difference between the two systems is their electrolytes, which transport ions to undergo electrochemical reactions at the electrodes. In AWEs, highly concentrated alkaline solutions are used as electrolytes, whereas proton exchange membranes are utilized as solid polymer electrolytes in PEMWEs.…”

Section: Introductionmentioning

confidence: 99%

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Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis

Nara

Tanaka

Kuroda

et al. 2022

Polymers for Advanced Techs

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Anion exchange membrane water electrolysis (AEMWE) is currently paying attention as a new hydrogen (H2) production method since it can operate at high current densities using inexpensive nonnoble metal catalysts. However, the significant problems of AEMs, including their insufficient anion conductivity and alkaline stability, prevent the practical usage of AEMWE. We show a novel anion conductive polymer, alkyl trimethylammonium‐substituted polyfluorene (TMA‐PF), bearing no heteroatom bonds in the main chain. The TMA‐PF membrane possesses higher anion conductivity than conventional AEMs due to the increased flexibility and mobility of the alkylammonium side chains of TMA‐PF. The TMA‐PF membrane shows high‐alkaline stability and maintains the initial ion conductivity after immersion in an aqueous NaOH solution (8 mol L−1) at 80°C for 48 h. In the water electrolysis evaluation, the cell using the TMA‐PF membrane exhibits a higher current density (400 mA cm−2 at 2.03 V) than the cell using the conventional AEM at the same potential, indicating that the novel AEM has a high potential to generate H2 effectively. Green hydrogen produced by AEMWE using renewable energy will be an environmentally benign energy source without CO2 emissions.

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Section: Methodsmentioning

confidence: 99%

Section: Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis

Nara

Tanaka

Kuroda

et al. 2022

Polymers for Advanced Techs

Self Cite

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“…S1a). 12 This electrolyzer has a geometric electrode area of 10 © 10 mm 2 and is equipped with a reference electrode. The reference electrode is connected to a membrane on the side of the electrode.…”

mentioning

confidence: 99%

Improvement of Time-zero Analysis Method in Activity Evaluation of Powder Electrocatalyst for Gas Evolution Reaction

TAKENAGA

Kuroda

et al. 2022

Electrochemistry

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In this study, we propose a highly accurate catalyst evaluation method by improving the time-zero analysis, which has been reported as an activity evaluation method for gas evolution powder catalysts. We refined the extrapolation approach to plot in this study's time-zero analysis as an analytical method. The Tafel slopes obtained with this method for LaNiO 3 (LNO) were found to be within the reported range, and the data was consistent in catalytic loading range of 2.5-3.3 mg -LNO cm −2 . Using the improved time-zero analysis, the kinetic activity of the gas evolution powder catalyst is possible to be evaluated with high accuracy.

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All‐Aromatic Polymer‐Based Anion Conductive Ionomers with Different Ion Exchange Capacities for Water Electrolysis

Nara,

Tomita,

Nagasawa

et al. 2024

Adv Eng Mater

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Anion exchange membrane water electrolysis (AEMWE) is vital for efficient, environmentally friendly, and cost‐effective hydrogen production. Herein, fluorene‐based polymers containing alkyl ammonium groups with different ion exchange capacities (IECs) for use in anion exchange membranes (AEMs) and anion exchange ionomers (AEIs) are investigated. Among the AEMs tested, the AEM with an IEC of 2.2 meq g−1 shows the highest anion conductivity because of its efficient water uptake characteristics. The anode catalyst layers utilize AEIs and iridium oxide catalyst particles. It is essential to select AEIs with appropriate IEC and suitable solvents for high‐performance anodes in water electrolyzers. Morphological and physical property evaluations reveal that moderate hydrophilicity and suppression of water swelling of AEIs improve water electrolysis performance. The optimized catalyst layer achieves better water electrolysis performance (2.64 V, 1.8 A cm−2 at 30 °C) than the conventional catalyst layer (3.83 V, 1.8 A cm−2 at 30 °C). Although the water electrolysis performance in this study falls short of the final targets, further research on anion conductive polymers and catalyst layers, based on this study's findings, is expected to promote practical applications of AEMWEs.

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Design and characterization of compact proton exchange membrane water electrolyzer for component evaluation test

Cited by 30 publications

References 31 publications

Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis

Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis

Improvement of Time-zero Analysis Method in Activity Evaluation of Powder Electrocatalyst for Gas Evolution Reaction

All‐Aromatic Polymer‐Based Anion Conductive Ionomers with Different Ion Exchange Capacities for Water Electrolysis

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