Potential-Dependent Adsorption and Desorption of Perfluorosulfonated Ionomer on a Platinum Electrode Surface Probed by Electrochemical Quartz Crystal Microbalance and Atomic Force Microscopy

Masuda, Toshio; Sonsudin, Faridah; Singh, Parminder; Naohara, Hideo; Uosaki, Kohei

doi:10.1021/jp404376t

Cited by 51 publications

(57 citation statements)

References 38 publications

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“…Figure 8 shows the Tafel plots for the ORR kinetic currents, which were obtained using Eq. 31,32 The Tafel slope is 65 mV · decade −1 for the bare Pt, which is close to a reported value above 0.82 V, 60 mV · decade −1 .…”

Section: Resultssupporting

confidence: 86%

Catalyst Poisoning Property of Sulfonimide Acid Ionomer on Pt (111) Surface

Kodama

Shinohara

Hasegawa

et al. 2014

J. Electrochem. Soc.

121

105

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The catalyst poisoning property of a novel ionomer, NBC4, which has two sulfonimide acid groups in its side chain ended with a perfluorobutane, instead of sulfonic acid groups as Nafion does, was theoretically and experimentally compared with that of Nafion. A density functional theory combined with a continuum electrolyte theory showed that the adsorption is weaker for sulfonimide anion than for sulfonate anion on Pt (111) surface. Electrochemical measurements using Pt (111) surfaced single crystal electrodes covered with the ionomer films showed the weaker anion adsorption and higher ORR activity by ca. 50% at 0.82 V vs the reversible hydrogen electrode for NBC4 than for Nafion.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 131.215.225.9 Downloaded on 2015-06-21 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 131.215.225.9 Downloaded on 2015-06-21 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 131.215.225.9 Downloaded on 2015-06-21 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 131.215.225.9 Downloaded on 2015-06-21 to IP

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Section: Resultssupporting

confidence: 86%

Catalyst Poisoning Property of Sulfonimide Acid Ionomer on Pt (111) Surface

Kodama

Shinohara

Hasegawa

et al. 2014

J. Electrochem. Soc.

121

105

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“…The absence of SA1's influence on either polycrystalline Pt or Pt/Vu (not shown) agrees with previous studies on adsorption of triflic acid (CF 3 SO 3 H) 41,42 and PFSA ionomer. 43 The authors reported a weak interaction, i.e. non-specific adsorption, between the sulfonate ion and Pt surface.…”

Section: Adsorption Impact Of Perfluorosulfonic Acids (Sa1 and Sa2)-mentioning

confidence: 99%

Impact of Polymer Electrolyte Membrane Degradation Products on Oxygen Reduction Reaction Activity for Platinum Electrocatalysts

Christ

Neyerlin

Richards

et al. 2014

J. Electrochem. Soc.

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The impact of model membrane degradation compounds on the relevant electrochemical parameters for the oxygen reduction reaction (i.e. electrochemical surface area and catalytic activity), was studied for both polycrystalline Pt and carbon supported Pt electrocatalysts. Model compounds, representing previously published, experimentally determined polymer electrolyte membrane degradation products, were in the form of perfluorinated organic acids that contained combinations of carboxylic and/or sulfonic acid functionality. Perfluorinated carboxylic acids of carbon chain length C1 -C6 were found to have an impact on electrochemical surface area (ECA). The longest chain length acid also hindered the observed oxygen reduction reaction (ORR) performance, resulting in a 17% loss in kinetic current (determined at 0.9 V). Model compounds containing sulfonic acid functional groups alone did not show an effect on Pt ECA or ORR activity. Greater than a 44% loss in ORR activity at 0.9 V was observed for diacid model compounds DA-Naf (perfluoro(2-methyl-3-oxa-5-sulfonic pentanoic) acid) and DA-3M (perfluoro(4-sulfonic butanoic) acid), which contained both sulfonic and carboxylic acid functionalities. While there has been a concerted effort to develop membranes and electrocatalysts that significantly improve the performance of polymer electrolyte membrane fuel cells (PEMFCs), systematic studies on the magnitude and mechanism of electrocatalyst performance degradation due to contaminants arising from system components have been less prevalent. With a Department of Energy 2017 target of less than 10% voltage degradation over 5000 hours of automotive fuel cell performance, and a 2013 status of 3600 hours, improvement in the area of durability is still required.1 Air, fuel, and system derived chemical contaminants can contribute to irreversible performance loss. However, due to the fact that many factors can affect durability in a fuel cell system, it is difficult to relate the performance loss to the degradation of specific component(s). And failure mechanisms are not well understood. 2Numerous studies focusing on the performance impact of impurities found in the anode fuel stream (e.g. CO, CO 2 , H 2 S, NH 3 , CH 4 and HCOOH), as well as common airborne contaminants present in the cathode stream (e.g. SO x and NO x ) have been conducted. [3][4][5][6][7][8][9][10][11] In addition, various research groups have examined the impact of aromatic contaminants and environmentally common anionic and cationic species. and Co 2+ ), originating from the bipolar plates and catalyst layer. 19-25Results of these studies show, in many cases, severe effects on fuel cell performance due in large to anion adsorption and irreversible chemisorption of poisoning compounds on the catalyst layer, as well as foreign cation uptake in the membrane. More recently, an investigation of species originating from balance of plant (BOP) components (e.g. structural materials and assembly aids) has shown fuel cell performance loss due to additives and other compoun...

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“…One possibility is the adsorption of sulfonic acid group in Nafion. [20][21][22] A mass-change measurement with an electrochemical quartz crystal microbalance using a Pt electrode in perfluorosulfonated ionomer solution demonstrated a mass increase during the anodic sweep. 20 Electrochemistry, 84 (7), 511-515 (2016)…”

Section: Oxide Formation/reduction Without Preceding Potential Holdmentioning

confidence: 99%

Kinetics of Oxide Formation and Reduction at Pt Catalyst in Polymer Electrolyte Fuel Cells

Suzuki

Morimoto

2016

Electrochemistry

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The rates of oxide formation and reduction at platinum catalyst in polymer electrolyte fuel cells were measured potentiostatically with various potential histories to reveal the kinetics of the reactions. Reaction rates during potential holds after an anodic or a cathodic sweep were examined as a function of potential and PtOH-equivalent oxide coverage. At 500 and 600 mV vs. RHE, the oxide coverage increased or decreased with increasing time depending on the potential history; this result indicates that the surfaces with different potential histories have different surface states. Oxide reduction rates were compared by changing potential and duration for oxide formation to attain the same coverage before the reduction. Oxide formed at a higher potential for a shorter period of time was easier to reduce than oxide formed at a lower potential for a longer period of time. This indicates that the oxide-formation potential and/or oxide-formation time are factors to determine the oxide reduction rate.

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Potential-Dependent Adsorption and Desorption of Perfluorosulfonated Ionomer on a Platinum Electrode Surface Probed by Electrochemical Quartz Crystal Microbalance and Atomic Force Microscopy

Cited by 51 publications

References 38 publications

Catalyst Poisoning Property of Sulfonimide Acid Ionomer on Pt (111) Surface

Catalyst Poisoning Property of Sulfonimide Acid Ionomer on Pt (111) Surface

Impact of Polymer Electrolyte Membrane Degradation Products on Oxygen Reduction Reaction Activity for Platinum Electrocatalysts

Kinetics of Oxide Formation and Reduction at Pt Catalyst in Polymer Electrolyte Fuel Cells

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