Application of FTIR in direct methanol fuel cells – Quantitative analysis of PTFE in gas diffusion layers

Jing, Mingyi; Jiang, Luhua; Wang, Suli; Jing, Fenning; Sun, Gongquan

doi:10.1016/j.ijhydene.2013.04.071

Cited by 15 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature, the humidity, and the current density within the stack should, at least, be taken into account , , . One way to adjust the surface properties of GDL is to vary fluoropolymer content in GDL .…”

Section: Introductionmentioning

confidence: 99%

Sliding Angle Characterization of Physicochemical and Roughness Changes of GDL Surfaces after Fuel Cell Operation

et al. 2018

View full text Add to dashboard Cite

The effect of proton exchange membrane fuel cell (PEMFC) operation on physicochemical properties and roughness of gas diffusion layers (GDL) was evaluated in this work. In addition to static contact angle measurements commonly used for GDLs, sliding angle measurements were also performed on a membrane electrode assembly (MEA) both new and used in service within commercial PEMFC. These latter revealed significant changes after 4,000 h in service that were not detectable with the static counterparts. The main novelty of this study is to correlate the contact and sliding angle measurements and to combine them with various modeling approaches developed for modeled surfaces. After 4,000 h of aging, it was thus shown that the surface of the GDLs became more hydrophilic, contrary to the roughness, which remains unchanged.

show abstract

Section: Introductionmentioning

confidence: 99%

Sliding Angle Characterization of Physicochemical and Roughness Changes of GDL Surfaces after Fuel Cell Operation

et al. 2018

View full text Add to dashboard Cite

show abstract

“…For local FTIR imaging of PTFE in the MPL the integrals of the C-F 2 stretch vibrations were analyzed in the spectral range 1100-1300 cm -1 , resembling the presence of PTFE [18]. Typical FTIR spectra of a non-lasered (high C-F intensity) and a lasered (low C-F intensity) region of the MPL are provided in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…For chemical modification the GDL samples were exposed to 1 M hydrogen peroxide or 1 M sulfuric acid solutions for 24 h in 80°C [16,18]. These modified samples were immersed in deionized (DI) water to remove the residues of solution.…”

Section: Experimental Sample Preparationmentioning

confidence: 99%

“…A typical FTIR microscopy image [18] consists of an array of numerous measuring points each measured in the attenuated total reflection (ATR) mode using a conical Ge crystal (diameter of the tip is 100 lm) that is pressed onto the sample for good mechanical contact, i.e., high signal to noise ratio. For high lateral resolution (1 lm) each measuring position (32 9 32 lm 2 ) was detected with a liquid nitrogen cooled mercury-cadmium-telluride focal plane array (FPA) detector consisting of 64 9 64 pixels.…”

Section: Ex Situ Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Modification of gas diffusion layers properties to improve water management

Martı́n

Biswas

Gazdzicki

et al. 2017

Mater Renew Sustain Energy

View full text Add to dashboard Cite

In this paper we report an approach to improve water management of commercial GDLs by introducing hydrophobicity patterns. Specifically, line and grid patterns have been created in the MPL side by laser radiation. For an in-depth investigation of these modified GDLs the current density distribution was monitored during fuel cell operation. Additionally, the physical properties of these materials were investigated by a number of ex situ methods such as Fourier transform infrared microscopy, electrochemical impedance spectroscopy and water vapor sorption. Furthermore, a comparison of the physical properties of the patterned GDLs with chemically modified GDLs (treated in H 2 SO 4 and H 2 O 2 ) is provided. Our results show a clearly improved homogeneity of current density distribution of the patterned GDLs compared to untreated GDLs. This observation is likely due to a reduced local hydrophobicity which facilitates water diffusion along the flow field of the fuel cell. However, performance of the fuel cell was not affected by the MPL irradiation.

show abstract

“…This value is much higher than those reported in literature that is usually in the range of 0.5-2 mg cm -2 . [29][30][31] To find the optimal carbon amount for Pt NWs GDE, the carbon loading in MPLs was studied based on the standard 35BA with the CB loadings of 1, 3, 4, 4.48 and 5 mg cm -2 . The PTFE percentage in the MPL was 20% based on the total MPL weight.…”

Section: Carbon Loading In Mplsmentioning

confidence: 99%

Evolution of gas diffusion layer structures for aligned Pt nanowire electrodes in PEMFC applications

Steinberger‐Wilckens

2018

Electrochimica Acta

View full text Add to dashboard Cite

Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

show abstract

Application of FTIR in direct methanol fuel cells – Quantitative analysis of PTFE in gas diffusion layers

Cited by 15 publications

References 22 publications

Sliding Angle Characterization of Physicochemical and Roughness Changes of GDL Surfaces after Fuel Cell Operation

Sliding Angle Characterization of Physicochemical and Roughness Changes of GDL Surfaces after Fuel Cell Operation

Modification of gas diffusion layers properties to improve water management

Evolution of gas diffusion layer structures for aligned Pt nanowire electrodes in PEMFC applications

Contact Info

Product

Resources

About