Improvement of cell performance in catalyst layers with silica-coated Pt/carbon catalysts for polymer electrolyte fuel cells

Park, Kayoung; Ohnishi, Takeshi; Goto, Masaki; So, Magnus; Tanaka, Sakae; Tsuge, Yoshifumi; Inoue, Gen

doi:10.1016/j.ijhydene.2019.11.097

Cited by 24 publications

(24 citation statements)

References 23 publications

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“…235 The benefits from coating with silica layers are not limited to the well-known aspects in terms of preventing metal NPs from degradation and acting as the selective membrane for oxygen diffusion onto the active sites. As reported from the work of Park et al, 236 the silica overlayer with hydrophilic Si-OH surface species could help in increasing the proton conductivity especially in low-humidity conditions. According to them, the overcoating of Pt/C with silica layers enabled the preparation of the anodic catalyst layer for PEFCs with a low ratio of ionomer to carbon.…”

Section: Overcoated Precious Metal Based Orr Electrocatalystsmentioning

confidence: 75%

Catalyst overcoating engineering towards high-performance electrocatalysis

2022

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Section: Overcoated Precious Metal Based Orr Electrocatalystsmentioning

confidence: 75%

Catalyst overcoating engineering towards high-performance electrocatalysis

2022

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“…Moreover, CLs with Pt/KB at 0.2 V (low potential region) exhibited the same tendency to improved performance by SiO2 coating, as shown in Figure 5b. In case of low humidity, SiO2-Pt/Vulcan also had superior performance compared to Pt/Vulcan [9]. Therefore, it is noted that the SiO2 coating of Pt catalysts significantly improves performance, regardless of carbon support, at low humidity condition that is severely low proton conductivity.…”

Section: Electrochemical Analysis Of Pt Catalystsmentioning

confidence: 94%

“…Notably, the SiO 2 -Pt/VB showed significantly enhanced performance compared with Pt/VB under low humidity, such as the condition of 20% RH. This result suggests that the hydrophilic groups included in SiO 2 layers contribute to enhancement of proton conductivity, resulting in enhanced cell performance [9].…”

Section: Introductionmentioning

confidence: 90%

“…The zeta-potential (ζ-potential) of catalyst ink was evaluated at 25 • C, in order to examine the stability of the ink. The values of the ζ-potential mean the degree of electrostatic repulsion between charged particles in the ink and the basic equation of repulsive potential energy is as shown below [9]:…”

Section: Particle Size Distribution Of the Catalyst Inkmentioning

confidence: 99%

“…However, if the ionomer content is too low, the place for proton paths will decrease, resulting in an increase in proton transport resistance. In our previous study [9], we developed cathode CLs with low ionomer content, and SiO 2 -coated Pt/carbon catalysts were used to enhance the proton conductivity. For these catalysts, developed by Takenaka et al, SiO 2 coating has the advantages of high durability, minimization of Pt particle agglomeration and diffusion of Pt cations in the catalyst, and flexible control of surface characteristics like hydrophobicity or hydrophilicity [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Cathode Catalyst Layer with SiO2-Coated Pt/Ketjen Black Catalysts on Performance for Polymer Electrolyte Fuel Cells

Park

Goto

et al. 2021

Catalysts

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In this study, we investigated the effect of silica (SiO2) layer included in a cathode catalyst layer (CL) on the performance for polymer electrolyte fuel cells (PEFCs). Porous carbons such as Ketjen black (KB) have been widely used as a support for Pt catalysts in PEFCs. Such KB-supported Pt catalyst (Pt/KB) was used as a cathode CL with low ionomer content (a condition of low proton conductivity). The Pt/KB was then coated with SiO2. In addition, the Pt/KB and SiO2-coated Pt/KB (SiO2-Pt/KB) were measured and analyzed under relative humidity (RH) conditions (100% and 20%). The catalyst ink of SiO2-Pt/KB showed higher stability and dispersion compared to Pt/KB, due to the hydrophilic surface characteristics of SiO2, which act as a binder-like ionomer. The performance of the SiO2-Pt/KB at 100% RH, was significantly lower than that of Pt/KB, whereas the performance of the Pt/KB at 20% RH, was significantly improved by SiO2 coating. This is due to an increase in the proton conductivity, which can be attributed to the hydrophilic properties of SiO2. Based on these results, the effect of SiO2 coating on performance, depending on carbon supports of SiO2-coated Pt/Carbon catalysts, could be evaluated.

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The use of silicon in the membrane electrode assembly of fuel cells

Antolini

2024

ChemCatChem

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Silicon, silicon‐based and Si‐containing materials are widely used and play different roles in fuel cells. These materials have been used overall in polymer electrolyte membrane fuel cells, but also in solid oxide fuel cells and phosphoric acid fuel cells. The most used Si compounds in fuel cells are SiO2 and SiC. In this work an overview of the use of Si‐based and Si‐containing materials in the membrane electrode assembly of fuel cells is presented.

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Improvement of cell performance in catalyst layers with silica-coated Pt/carbon catalysts for polymer electrolyte fuel cells

Cited by 24 publications

References 23 publications

Catalyst overcoating engineering towards high-performance electrocatalysis

Catalyst overcoating engineering towards high-performance electrocatalysis

Influence of Cathode Catalyst Layer with SiO2-Coated Pt/Ketjen Black Catalysts on Performance for Polymer Electrolyte Fuel Cells

The use of silicon in the membrane electrode assembly of fuel cells

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