Influences of Mechanical and Structural Factors on the Durability of PEFC with Gel Electrolyte Membranes

Chiba, Hiroki; Komazaki, Shin‐ichi; Watanabe, Masao; Kohno, Yutaka

doi:10.5796/electrochemistry.75.238

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…considering real potential range under actual usage (100~800mV S.C.E.) [11]. Obtained anodic polarization curves were summarized in Figs 5 and 6.…”

Section: Corrosion Resistance Of Au/ni Thin Films Coated Stainless Stmentioning

confidence: 99%

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Corrosion resistance of Au/Ni thin films coated stainless steel used for a PEFC separator

Kimura¹,

Hirano²

2013

WIT Transactions on Engineering Sciences

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Recently, as a new clean and renewable energy much attention has been paid to the PEFC (Polymer Electrolyte Fuel Cell) because of energy and environmental problems, such as depletion of petroleum, global warming and so on. PEFC has the characteristics of a simple structure, easy to maintain and a low cost. One of the parts of the PEFC is called the 'separator'; metal separators have a major issue regarding compatibility with corrosion resistance and electrical conductivity, in addition to low cost. Using current technology, we have selected a stainless steel AISI316L with an Au/Ni skin film. Therefore, there is a need to make a thinner skin film especially an Au top film for suppressing the PEFC total cost. When thinking about skin film, defects in the Au top film increases gradually as the thickness of Au film decreases. As a result, intensive corrosion is generated due to defects in the Au/Ni skin film. However, there are few reports evaluating correlation between the corrosion characteristics of stainless steel with an Au/Ni skin film under a PEFC environment and existing defects in the Au/Ni skin film. Therefore in this study, the pinhole defect ratio especially in Au film was evaluated using the CPCD method. Au/Ni double layered coating was formed on AISI316L stainless steel employing the sputtering method because of its high adhesion strength. As the quasi-PEFC environment 1M H 2 SO 4 aqueous solution was selected and then the pinhole defect ratio was evaluated by the CPCD method. As a result, the pinhole defect area ratio of 80nm thick Au film was obtained to be about 1.1% in 1M H 2 SO 4 aqueous solution.

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“…considering real potential range under actual usage (100~800mV S.C.E.) [11]. Obtained anodic polarization curves were summarized in Figs 5 and 6.…”

Section: Corrosion Resistance Of Au/ni Thin Films Coated Stainless Stmentioning

confidence: 99%

“…S.C.E.) considering real potential range under actual usage (100~800mV SCE)[11]. Through considering separator's actual operating conditions anodic polarization measurement were conducted under the conditions summarized inTable 6.…”

mentioning

confidence: 99%

Corrosion resistance of Au/Ni thin films coated stainless steel used for a PEFC separator

Kimura¹,

Hirano²

2013

WIT Transactions on Engineering Sciences

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“…All tests were performed in 0.5 H 2 SO 4 aqueous solution of 348 K. Potentio-dynamic corrosion tests were conducted with the sweep rate of 60 mV/min from -200 mV to 1500 mV (vs. SCE) considering the real potential range under actual usage (100-800 mV SCE) [9]. Through considering the separator's actual operating conditions, anodic polarization measurements were conducted under the conditions summarized in Table 6.…”

Section: Corrosion Resistance Of Au/ni Thin Films Coated Stainless Stmentioning

confidence: 99%

“…From these results, sufficient corrosion resistance of Au/Ni thin films coated AISI316L stainless steel under static quasi-PEFC environment of 0.5 M H2SO4 aqueous solution at 353 K was obtained within thin Au top films of thickness in the range of 20 nm and over. For evaluating the corrosion resistance of Au/Ni thin films coated AISI316L stainless steel under a quasi-PEFC environment, a potentio-dynamic corrosion test was conducted with the sweep rate of 60 mV/min from -200 mV to 1500 mV (vs. SCE) considering the real potential range under actual usage (100-800 mV SCE) [9]. The current density of Au/Ni thin films coated AISI316L stainless steel was suppressed down to about 1/100 level compared to that detected in bare substrate AISI316L stainless steel.…”

Section: Corrosion Resistance Of Au/ni Thin Film-coated Stainless Stementioning

confidence: 99%

Corrosion resistance of Au/Ni thin film-coated stainless steel used as a polymer electrolyte fuel-cell separator

Kimura¹,

Hirano²

2017

WIT Transactions on State-of-the-Art in Science and Engineering

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Recently, as a new clean and renewable energy, much attention has been paid to the polymer electrolyte fuel cell (PEFC) because of energy and environmental problems, such as depletion of petroleum and global warming. PEFC has the characteristics of a simple structure, is easy to maintain and has a low cost. One of the parts of the PEFC is called the 'separator'; metal separators have a major issue regarding compatibility with corrosion resistance and electrical conductivity, in addition to low cost. Using current technology, a stainless steel AISI316L with an Au/Ni skin film has here been selected. Therefore, there is a need to make a thinner skin film, especially an Au top film for suppressing the PEFC total cost. When thinking about skin film, defects in the Au top film increase gradually as the thickness of Au film decreases. As a result, extensive corrosion is generated due to defects in the Au/Ni skin film. There are few reports evaluating the correlation between the corrosion characteristics of stainless steel with an Au/Ni skin film under a PEFC environment and existing defects in the Au/Ni skin film. Therefore, in this study, the pinhole defect ratio especially in Au film was evaluated using the critical passivation current density (CPCD) method. Au/Ni double layered coating was formed on AISI316L stainless steel employing the sputtering method because of its high adhesion strength. As the quasi-PEFC environment, 1 M H2SO4 aqueous solution was selected and then the pinhole defect ratio was evaluated by the CPCD method. As a result, the pinhole defect area ratio of 80 nm thick Au film was obtained to be about 1.1% in 1 M H 2 SO 4 aqueous solution.

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Influences of Mechanical and Structural Factors on the Durability of PEFC with Gel Electrolyte Membranes

Cited by 2 publications

References 8 publications

Corrosion resistance of Au/Ni thin films coated stainless steel used for a PEFC separator

Corrosion resistance of Au/Ni thin films coated stainless steel used for a PEFC separator

Corrosion resistance of Au/Ni thin film-coated stainless steel used as a polymer electrolyte fuel-cell separator

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