Thermo-electrical instabilities arising in proton exchange membrane of fuel cell

Bograchev, D. A.; Martemianov, S.

doi:10.1016/j.ijheatmasstransfer.2011.02.046

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…1) One well-known commercially available membrane that exhibits excellent proton conductivity is Nafion ® 117. 2,3) However, this membrane is expensive. 4,5) As such, cheap alternatives with matching properties are continually sought.…”

Section: Introductionmentioning

confidence: 99%

Increasing the proton conductivity of sulfonated polyether ether ketone by incorporating graphene oxide: Morphology effect on proton dynamics

Leong

Diño

Ahmad

et al. 2018

Jpn. J. Appl. Phys.

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We synthesized graphene oxide-sulfonated polyether ether ketone (GO-SPEEK) composite membrane and compare its proton conductivity with that of Nafion ® 117 and SPEEK membranes. From experimental measurements, we found that GO-SPEEK has better proton conductivity (σ GO-SPEEK = 3.8 ' 10 %2 S cm %1 ) when compared to Nafion ® 117 (σ Nafion = 2.4 ' 10 %2 S cm %1 ) and SPEEK (σ SPEEK = 2.9 ' 10 %3 S cm %1 ). From density functional theory (DFT-) based total energy calculations, we found that GO-SPEEK has the shortest proton diffusion distance among the three membranes, yielding the highest tunneling probability. Hence, GO-SPEEK exhibits the highest conductivity. The short proton diffusion distance in GO-SPEEK, as compared to Nafion ® 117 and SPEEK, can be attributed to the presence of oxygenated functional groups of GO in the polymer matrix. This also explains why GO-SPEEK requires the lowest hydration level to reach its maximum conductivity. Moreover, we have successfully shown that the proton conductivity σ is related to the tunneling probability T, i.e., σ = σ$ exp(%1/T). We conclude that the proton diffusion distance and hydration level are the two most significant factors that determine the membrane's good conductivity. The distance between ionic sites of the membrane should be small to obtain good conductivity. With this short distance, lower hydration level is required. Thus, a membrane with short separation between the ionic sites can have enhanced conductivity, even at low hydration conditions.

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Section: Introductionmentioning

confidence: 99%

Increasing the proton conductivity of sulfonated polyether ether ketone by incorporating graphene oxide: Morphology effect on proton dynamics

Leong

Diño

Ahmad

et al. 2018

Jpn. J. Appl. Phys.

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Operating Temperature Dependency on Performance Degradation of Direct Methanol Fuel Cells

et al. 2012

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The effect of operating temperature on performance degradation of direct methanol fuel cell (DMFCs) is examined to disclose the main parameter of the degradation mechanism and the degradation pattern in the membrane electrode assemblies (MEAs). The DMFC MEA degradation phenomenon is explained through the use of various electrochemical/physicochemical tools, such as electrochemical impedance spectroscopy, electrode polarization, methanol stripping voltametry, field emission‐scanning electron microscopy, X‐ray diffraction, inductively coupled plasma‐atomic emission spectroscopy, and X‐ray photoelectron spectroscopy analysis. The operation of DMFC under high temperature accelerates the degradation process of the DMFC. The higher degradation rate under high temperature DMFC operation is mainly attributed to the formation of membrane pinhole with interfacial delamination and cathode degradation. A high operating temperature may result in more considerable thermal and mechanical stress of the polymeric membrane continuously due to frequent dry–wet cycling mode and substantial uneven distribution of water between the anode and the cathode during a long period of DMFC operation. On the other hand, the electrochemical surface area deterioration by Pt coarsening and ionomers loss is not directly related to the larger DMFC performance decay at high temperature.

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Effect of Anode Change on Heat Transfer and Magneto-hydrodynamic Flow in Aluminum Reduction Cell

Wang

Fafard

2015

JOM

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Thermo-electrical instabilities arising in proton exchange membrane of fuel cell

Cited by 3 publications

References 20 publications

Increasing the proton conductivity of sulfonated polyether ether ketone by incorporating graphene oxide: Morphology effect on proton dynamics

Increasing the proton conductivity of sulfonated polyether ether ketone by incorporating graphene oxide: Morphology effect on proton dynamics

Operating Temperature Dependency on Performance Degradation of Direct Methanol Fuel Cells

Effect of Anode Change on Heat Transfer and Magneto-hydrodynamic Flow in Aluminum Reduction Cell

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