Interface contribution to the electrode performance of proton exchange membrane fuel cells – Impact of the ionomer

Andersen, Shuang Ma; Grahl‐Madsen, Laila

doi:10.1016/j.ijhydene.2015.11.101

Cited by 47 publications

(45 citation statements)

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“…Subsequently, when the Naon fraction was too high, the Naon can form aggregates or micelle structures, which are more thermodynamically stable at certain ionomer content. 43 This resulted in particle separation at large distances where good electronic conduction was likely to have been inhibited. The presence of excess Naon also impeded gas transport and increased mass transport resistance within the catalyst layer leading to a reduced performance.…”

Section: Synthesis Of Cuomentioning

confidence: 99%

Highly efficient electro-reduction of CO₂ to formic acid by nano-copper

2016

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Section: Synthesis Of Cuomentioning

confidence: 99%

Highly efficient electro-reduction of CO₂ to formic acid by nano-copper

2016

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“…The catalyst/ionomer interface has been reported to affect the electrochemical catalytic performance of the electrode significantly. [48,[56][57][58] The catalyst/ ionomer interface may similarly affect the Pt/electrolyte interaction, [50,59] and hence the Pt-dissolution during the electrochemical treatment. To study the impact of catalyst/ionomer interface on the Pt-dissolution, PEMFC electrodes having different catalyst ink compositions with Nafion contents of 0, 15, 30 and 45 wt.% were studied.…”

Section: Electrode Interface Influence On Pt Catalyst Dissolutionmentioning

confidence: 99%

Sustainable Platinum Recycling through Electrochemical Dissolution of Platinum Nanoparticles from Fuel Cell Electrodes

et al. 2019

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Recycling of the platinum group metals (PGMs) containing industrial wastes obtained from proton exchange membrane fuel cells (PEMFCs), electrolyzers, catalytic convertors and others is of high strategical importance for industrial sustainability. In this work, a highly efficient and environmentally friendly platinum recycling method through potentiodynamic cycling in dilute acidic chloride solutions is demonstrated and optimized to recover platinum from fuel cell electrodes. The process parameters such as upper and lower potential limits are optimized to be 1.6 and 0.4 V vs. RHE. Both the dilute acidic and the acid free Cl− containing electrolytes may be used for the dissolution. Moreover, parameters such as protocol reliability, quantification method and comparison, electrode interface structure, dissolution product and mechanisms etc. are discussed. A study in 1 M HCl shows Pt dissolution rates as high as ∼30 μg/cycle for potential cycling between 0.4 and 1.6 V (scan rate: 100 mV/s) for a PEMFC electrode with initial Pt loading of ∼470 μg. The approach demonstrates a methodology for fast parameter screening on electrocatalyst dissolution and a proof of concept industrial recycling of spent electrocatalysts.

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“…4 Temperature effects on a ECSA and b C dl of various Nafion contents CLs Fig. 5 The temperature effect on ORR performance in various Nafion content CLs (ORR kinetic activity I k at 0.9 V vs RHE and limiting current I Lim at 0.4 V vs RHE, the simplified sketch on the electrode structure reprinted from reference [22]. Copyright 2016 Elsevier) 40°C.…”

Section: Orr Performance By Linear Scanning Voltammetrymentioning

confidence: 99%

“…In the high region, this phenomenon is not obvious due to the thickness and aggregation increase of Nafion and the catalyst exposure is more than that in low region. The Nafion ionomer tends to from an agglomerated particle in contact with Pt/C [22]. In general, the Nafion covered the catalyst surface will hinder the oxygen transfer to reaction interface, which has become the major bottleneck for low Pt loading and high current density of PEMFCs [4,7,8].…”

Section: Structural Model Of Reaction Interface For Orrmentioning

confidence: 99%

“…Andersen et al found that the catalyst surface exposure (CSE) will be decreased with increasing the amount of the Nafion up to 30 wt.%, and further increasing Nafion content will turn out to increase CSE due to Nafion aggregation. They emphasized that the proper content of Nafion covered catalyst surface is crucial to form an optimal electrode structure [22]. Actually, the coverage and morphology of Nafion are sensitive to the surface energy of the applied catalysts.…”

Section: Introductionmentioning

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Electrochemical study of temperature and Nafion effects on interface property for oxygen reduction reaction

Chen

Zhong²,

et al. 2018

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With the growth of new energy economy, proton exchange membrane fuel cell (PEMFC) has great potential to be success. However, the lack of high-performance catalyst layer (CL) especially at cathode limits its applications. It is becoming increasingly important to understand interface property during electrocatalytic oxygen reduction reaction (ORR). Here, the rotating disk electrode (RDE) method is developed to study the temperature and Nafion ionomer content effects on interface formed between Nafion and Pt/C. The results show that the temperature has the significant influence on electrochemical active sites, charging double capacitance, and reaction polarization resistance at low Nafion content region. Excess Nafion loaded in CLs will turn to self-reunion and increase the exposed active sites. We find that the optimum Nafion loading is in the range of 30 to 40 wt.%. The highest specific activity we achieve is 107.8 μA/cm 2 .Pt at 60°C with 0.4 of ionomer/catalyst weight ratio, corresponding to the kinetic current 283.5 μA at 0.9 V. This finding provides new insights into enhancing the Pt utilization and designing high-efficiency catalysts for ORR.

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Interface contribution to the electrode performance of proton exchange membrane fuel cells – Impact of the ionomer

Cited by 47 publications

References 44 publications

Highly efficient electro-reduction of CO₂ to formic acid by nano-copper

Highly efficient electro-reduction of CO₂ to formic acid by nano-copper

Sustainable Platinum Recycling through Electrochemical Dissolution of Platinum Nanoparticles from Fuel Cell Electrodes

Electrochemical study of temperature and Nafion effects on interface property for oxygen reduction reaction

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Interface contribution to the electrode performance of proton exchange membrane fuel cells – Impact of the ionomer

Cited by 47 publications

References 44 publications

Highly efficient electro-reduction of CO2 to formic acid by nano-copper

Highly efficient electro-reduction of CO2 to formic acid by nano-copper

Sustainable Platinum Recycling through Electrochemical Dissolution of Platinum Nanoparticles from Fuel Cell Electrodes

Electrochemical study of temperature and Nafion effects on interface property for oxygen reduction reaction

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Product

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Highly efficient electro-reduction of CO₂ to formic acid by nano-copper

Highly efficient electro-reduction of CO₂ to formic acid by nano-copper