Long-term Stable Electrodes Based on Platinum Electrocatalysts Supported on Titanium Sintered Felt for the Use in PEM Fuel Cells

Rost, Ulrich; Podleschny, Pit; Schumacher, M.; Muntean, Roxana; Pascal, D. T.; Mutascu, C.; Koziolek, J.; Mărginean, Gabriela; Brodmann, Michael

doi:10.1088/1757-899x/416/1/012013

Cited by 7 publications

(8 citation statements)

References 5 publications

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“…The smaller Pt agglomerates on top of the areal sub-structure ( Figure 4 c) resulted from increased current density in the PED process, leading to an increased number of growth-nuclei and, therefore, smaller agglomerates. Similar Pt structures have previously been reported by our research group, using different pre-treatment and deposition parameters [ 43 ]. Moreover, the obtained deposition-dependent Pt agglomerate structures were in good agreement with the characterizations of Abraham et al [ 51 ].…”

Section: Resultssupporting

confidence: 87%

“…Electrochemical catalyst deposition can be considered an easy, fast, scalable and industrial preparation process for electrode manufacturing. Moreover, electrochemical catalyst deposition, compared to the state-of-the-art applied spray-coating approach of chemically synthesized catalyst particles, offers the advantages of increased catalyst utilization, as the catalyst can be deposited as a graded catalyst layer [ 42 , 43 ], and the suppression of supporting material corrosion due to mechanical connection of the catalyst to the electrode substrate [ 10 ]. Moreover, suppression of performance losses caused by cracking and dissolution of the ionomer binder [ 10 ] is achievable, due to the process-related graded catalyst layer.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Bifunctional Ti-Based Gas Diffusion Electrode for ORR and OER by One- and Two-Step Pt-Ir Electrodeposition

Cieluch¹,

Podleschny²,

Kazamer³

et al. 2022

Nanomaterials

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The present paper presents one- and two-step approaches for electrochemical Pt and Ir deposition on a porous Ti-substrate to obtain a bifunctional oxygen electrode. Surface pre-treatment of the fiber-based Ti-substrate with oxalic acid provides an alternative to plasma treatment for partially stripping TiO2 from the electrode surface and roughening the topography. Electrochemical catalyst deposition performed directly onto the pretreated Ti-substrates bypasses unnecessary preparation and processing of catalyst support structures. A single Pt constant potential deposition (CPD), directly followed by pulsed electrodeposition (PED), created nanosized noble agglomerates. Subsequently, Ir was deposited via PED onto the Pt sub-structure to obtain a successively deposited PtIr catalyst layer. For the co-deposition of PtIr, a binary PtIr-alloy electrolyte was used applying PED. Micrographically, areal micro- and nano-scaled Pt sub-structure were observed, supplemented by homogenously distributed, nanosized Ir agglomerates for the successive PtIr deposition. In contrast, the PtIr co-deposition led to spherical, nanosized PtIr agglomerates. The electrochemical ORR and OER activity showed increased hydrogen desorption peaks for the Pt-deposited substrate, as well as broadening and flattening of the hydrogen desorption peaks for PtIr deposited substrates. The anodic kinetic parameters for the prepared electrodes were found to be higher than those of a polished Ir-disc.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Development of a Bifunctional Ti-Based Gas Diffusion Electrode for ORR and OER by One- and Two-Step Pt-Ir Electrodeposition

Cieluch¹,

Podleschny²,

Kazamer³

et al. 2022

Nanomaterials

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“…Metal felts are usually obtained via melt spun and sintered metal processes. The most relevant type is Pt/Ti felt [2], [3], due to its corrosion resistance. Other common felts are Ir/Ti [4], Rh-Ru/Ti [5] and stainless steel (SS) felt [6].…”

Section: Manufacturing Methodsmentioning

confidence: 99%

“…A classic example is Pt on Ti substrates, such as felt [2], [3] and mesh [17], [18]. Other examples on Ti are Ir [4] and Rh and Ru [5] on felt or Sb on Ti foam [19].…”

Section: Surface Modification Strategiesmentioning

confidence: 99%

Three-dimensional porous metal electrodes: Fabrication, characterisation and use

Arenas

León

Walsh

2019

Current Opinion in Electrochemistry

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Diverse 3D porous metal electrodes, including meshes, foams and felts, are used in electrochemical flow reactors for a wide range of industrial applications, such as energy storage, electrosynthesis and degradation of pollutants. Recent work centres on the hierarchical decoration and coating of 3D electrodes with catalysts, although the study of their performance in a controlled and reproducible flow and mass transfer environment ought to receive more attention. New advances have considered metal nanofelts and nanomesh porous electrodes which show superior productivity. Opportunities are found in additive manufacturing, advanced structural characterization by e.g., X-ray computed tomography, and in 3D modelling of the hydrodynamic characteristics, current distribution and mass transfer coefficient.

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“…Next, in a controlled manner, Pt nucleates on C by adding a reducing agent or thermal reduction . Similarly, Pt is deposited on multiwalled carbon nanotubes (MWCNTs); however, a chemical pre/post-treatment in a harsh acidic/alkaline medium is required for the activation, functionalization, or purification of MWCNTs to guarantee the anchoring of Pt on their surface. − Using approach (ii), Pt coating on Ti felt was made to be used in PEM fuel cells, where the authors used many steps such as cleaning in nitric and hydrofluoric acids, argon plasma cleaning, and electroplating …”

Section: Introductionmentioning

confidence: 99%

Two-Step Dry Synthesis of Binderless 3D Low Pt-Loading Electrocatalysts for Direct Alkaline Methanol Fuel Cell Anodes

Pajootan

Coulombe

Omanovic

2021

ACS Appl. Energy Mater.

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Three-dimensional (3D) porous electrocatalysts of low platinum loading were synthesized by gas-phase pulsed laser ablation (PLA) and deposited on multiwalled carbon nanotubes (MWCNTs) directly grown on a stainless steel mesh current collector by catalyst-free chemical vapor deposition (Pt/MWCNT/SS). The performance of the developed electrocatalysts was evaluated for the methanol oxidation reaction (MOR). The PLA chamber pressure and ablation time were optimized to achieve the highest methanol oxidation current per Pt loading and electrochemically active surface area while maintaining structural stability. The most robust electrocatalyst, obtained with PLA at 10–5 Torr for 5 min, exhibited a 50% higher methanol oxidation current compared to the commercial Pt/C with similar Pt loading. In addition, it showed the lowest loss of active sites after stability tests while maintaining its structural integrity. Increasing the electrolyte temperature from 0 to 80 °C significantly improved the methanol oxidation current on Pt/MWCNT/SS by 13 times compared to 5.8 times for Pt/C. Electrochemical impedance spectroscopy confirmed the faster kinetics of MOR and accelerated oxidation of adsorbed CO on the surface of the Pt/MWCNT/SS relative to the Pt/C.

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Long-term Stable Electrodes Based on Platinum Electrocatalysts Supported on Titanium Sintered Felt for the Use in PEM Fuel Cells

Cited by 7 publications

References 5 publications

Development of a Bifunctional Ti-Based Gas Diffusion Electrode for ORR and OER by One- and Two-Step Pt-Ir Electrodeposition

Development of a Bifunctional Ti-Based Gas Diffusion Electrode for ORR and OER by One- and Two-Step Pt-Ir Electrodeposition

Three-dimensional porous metal electrodes: Fabrication, characterisation and use

Two-Step Dry Synthesis of Binderless 3D Low Pt-Loading Electrocatalysts for Direct Alkaline Methanol Fuel Cell Anodes

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