Optimization of catalyst-coated membranes for enhancing performance in proton exchange membrane electrolyzer cells

Xie, Zhiqiang; Yu, Shule; Yang, Gaoqiang; Li, Kui; Ding, Lei; Wang, Weitian; Zhang, Fengyuan

doi:10.1016/j.ijhydene.2020.09.239

Cited by 36 publications

(25 citation statements)

References 38 publications

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“…Compared with the decal transfer process, direct spraying method has the advantages of low cost and less process flow. Research has shown that direct spraying shows performance advantages at high current densities, [ 260 ] although it brings about problems such as film swelling during the preparation process, [ 261 ] which requires more careful processing (Figure 18g). While in the PTE technology, catalysts are coated or deposited on PTLs, with performance often inferior to CCM technology.…”

Section: Application In Pemwementioning

confidence: 99%

Section: Ionomermentioning

confidence: 99%

mentioning

confidence: 99%

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Section: Application In Pemwementioning

confidence: 99%

Section: Ionomermentioning

confidence: 99%

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Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

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et al. 2022

Advanced Energy Materials

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“…Figure a presents typical current–voltage ( I – V ) curves for two graphene-based MEA structures and their contrast experiments. The decomposed voltage for each cell was significantly higher than that of the state-of-the-art PEMWE technology, and this could be due to the high cell resistance in our homemade electrolyzer, which primarily focused on hydrogen isotope efficiency and neglected cell structure optimization. The decorated Pt schemes with lower catalyst loadings (2 nm thickness) had a higher cell resistance than the coated Pt schemes with a Pt loading of 0.5 mg cm –2 .…”

Section: Resultsmentioning

confidence: 99%

High Hydrogen Isotope Separation Efficiency: Graphene or Catalyst?

Chu

Zhang

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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Single-layer graphene has been demonstrated to be a high-efficiency hydrogen isotope sieving membrane in the electrochemical hydrogen pumping system. In this work, we transferred this membrane to proton exchange membrane water electrolysis (PEMWE), which has wide industrial applications. Two membrane electrode assemblies with decorated Pt and ink-coated Pt were investigated. The graphene with the decorated Pt scheme acquired the reported highest proton-to-tritium separation factor of 19.50 in PEMWE. However, rather than graphene, the decorated catalyst was demonstrated to be responsible for this remarkable separation efficiency. Previous studies from Geim’s group underestimated the enhanced separation efficiency of decorated Pt over ink-coated Pt, resulting in an exaggerated separation efficiency for graphene. The behavior of proton transfer with hydrogen isotope separation through graphene was interpreted by a serial-parallel circuit model, which suggested that hydrogen isotope separation occurs at defect sites. The limited separation efficiency for graphene was also well understood by a density functional theory (DFT) calculation using an SW 55-77 model and the transition state theory for the kinetic isotope effect. This research provides a thorough understanding of proton transfer with hydrogen isotope separation through graphene.

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“…However, only a few researchers have studied the effects of electrode fabrication methods. For example, Zhang et al have investigated the electrodes fabricated via decal transfer and direct deposition for CCMs, and they found that CCMs fabricated with a direct spray deposition method displayed better cell performance compared to CCMs fabricated with a decal transfer method, which is mainly due to greatly reduced ohmic resistances and improved mass transport [ 42 ]. They also developed an advanced patterned electrode that can achieve good performance and found that the catalyst mass activity can be significantly improved [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Studying Performance and Kinetic Differences between Various Anode Electrodes in Proton Exchange Membrane Water Electrolysis Cell

Kang

Zhang

et al. 2022

Materials

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The electrode, as one of the most critical components in a proton exchange membrane water electrolysis (PEMWE) cell for hydrogen production, has a significant impact on cell performance. Electrodes that are fabricated via various techniques may exhibit different morphologies or properties, which might change the kinetics and resistances of the PEMWE. In this study, we have successfully fabricated several electrodes by different techniques, and the effects of electrode coating methods (ultrasonic spray, blade coating, and rod coating), hot press, and decal transfer processes are comprehensively investigated. The performance differences between various electrodes are due to kinetic or high frequency resistance changes, while the influences are not significant, with the biggest deviation of about 26 mV at 2.0 A cm−2. In addition, the effects of catalyst ink compositions, including ionomer to catalyst ratio (0.1 to 0.3), water to alcohol ratio (1:1 to 3:1), and catalyst weight percentage (10% to 30%), are also studied, and the electrodes’ performance variations are less than 10 mV at 2.0 A cm−2. The results show that the PEMWE electrode has superior compatibility and redundancy, which demonstrates the high flexibility of the electrode and its applicability for large-scale manufacturing.

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Optimization of catalyst-coated membranes for enhancing performance in proton exchange membrane electrolyzer cells

Cited by 36 publications

References 38 publications

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

High Hydrogen Isotope Separation Efficiency: Graphene or Catalyst?

Studying Performance and Kinetic Differences between Various Anode Electrodes in Proton Exchange Membrane Water Electrolysis Cell

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