Highly Active Carbon Supported PtCu Electrocatalysts for PEMFCs by <i>in situ</i> Supercritical Deposition Coupled with Electrochemical Dealloying

Barim, Sansim Bengisu; Bozbağ, Selmi Erim; Deljoo, Bahareh; Aindow, Mark; Erkey, Can

doi:10.1002/fuce.201900087

Cited by 22 publications

(11 citation statements)

References 61 publications

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“…Secondly, it is necessary to determine, whether such de-alloyed PtCu x−y /C catalysts retain high stability and activity in ORR and MOR, which are characteristic of the previously studied alloyed PtCu x /C catalysts [27][28][29][30][31]. Note that uneven distribution of the doping component atoms in the "body" of the initial PtM nanoparticles obtained during the synthesis, as well as the changes in conditions of their de-alloying can apparently affect both the composition and activity/stability of the de-alloyed catalysts [21,22,[32][33][34][35]. Thus, the search for the best PtCu compositions and structures of bimetallic nanoparticles, selection of the optimal conditions for the transformation of alloyed PtCu x /C catalysts into a de-alloyed state, as well as the study of the de-alloyed PtCu x−y /C catalysts behavior, proves to be timely and relevant.…”

Section: Introductionmentioning

confidence: 58%

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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The behavior of supported alloyed and de-alloyed platinum-copper catalysts, which contained 14–27% wt. of Pt, was studied in the reactions of methanol electrooxidation (MOR) and oxygen electroreduction (ORR) in 0.1 M HClO4 solutions. Alloyed PtCux/C catalysts were prepared by a multistage sequential deposition of copper and platinum onto a Vulcan XC72 dispersed carbon support. De-alloyed PtCux−y/C catalysts were prepared by PtCux/C materials pretreatment in acid solutions. The effects of the catalysts initial composition and the acid treatment condition on their composition, structure, and catalytic activity in MOR and ORR were studied. Functional characteristics of platinum-copper catalysts were compared with those of commercial Pt/C catalysts when tested, both in an electrochemical cell and in H2/Air membrane-electrode assembly (MEA). It was shown that the acid pretreatment of platinum-copper catalysts practically does not have negative effect on their catalytic activity, but it reduces the amount of copper passing into the solution during the subsequent electrochemical study. The activity of platinum-copper catalysts in the MOR and the current-voltage characteristics of the H2/Air proton-exchange membrane fuel cell MEAs measured in the process of their life tests were much higher than those of the Pt/C catalysts.

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Section: Introductionmentioning

confidence: 58%

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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“…To characterize the structure of Pt nanoparticles, field release scanning electron microscopy, transmission electron microscopy, and X‐ray diffraction can be used 92 . Barim et al 93 suggested manipulated variables in the advanced decomposition process by in situ supercritical depositions (SCD) technique, associated with thermal annealing and electrochemical dealloying in supercritical CO 2 , such as increasing the temperature where the particle size of Pt increased regardless of the CA used. This indicated that the synthesis method and the parameters played are very important in the production of catalysts, and the average metal particle measurement control method can be applied to expand the supporting materials, which have various properties and characteristics.…”

Section: Current Limitations To Organic Aerogelmentioning

confidence: 99%

Organic aerogel as electro‐catalytic support in low‐temperature fuel cell

Osman

Kamarudin

Basri

et al. 2022

Intl J of Energy Research

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Fuel cells have been developed efficiently in recent years as a secure and highenergy conversion technology. The innovation in electrocatalysis focuses on initiatives to minimize or replace Pt electrodes used. As an alternative, organic aerogel materials are normally used as electrodes in low temperature fuel cells due to their high electronic conducting and electrocatalytic characteristics. These are usually characterized by fundamental functional elements of strong covalent C-C bonds from organic precursors. This review will mainly focus on organic aerogel nanomaterials related to carbon aerogels, carbon nanotube aerogels, and graphene aerogels as electrocatalytic supports by surface modification or structural features in catalysis. In contrast, organic aerogel materials prove to be durable, economical, and active electrocatalysts that can provide outstanding electrocatalytic efficiency in low temperature fuel cell applications. Last, this paper recaps the challenges faced in current fuel cell applications and the use of organic aerogel materials to address these challenges.

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“…Co, Ni, Cu, Fe) exhibit an increased activity for the oxygen reduction reaction (ORR) and thus lead to a remarkable performance improvement of the corresponding membrane electrode assembly (MEA) in PEMFCs compared to pure Pt/C based systems. [6][7][8][9][10][11] Advantageously, the dilution of the particle core with these 3d transition metals simultaneously leads to a reduction in the total amount of noble metal. 12 However, the use of these alloying transition metals also comes with two major disadvantages: the higher complexity of the overall catalyst, e.g.…”

Section: Introductionmentioning

confidence: 99%

PtCo/C catalysts with narrow particle size distribution improve high current density operation in PEM fuel cells

Heizmann

Nguyen

Holst

et al. 2022

Preprint

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The design of catalysts with stable and finely dispersed platinum on the carbon support is key in controlling the performance of fuel cells. In the present work, an intermetallic PtCo/C catalyst with a narrow particle size distribution synthesized via double-passivation galvanic displacement is demonstrated. The catalyst exhibits an improved high-current-density performance in single-cell low-temperature fuel cell tests. TEM and XRD confirm a significantly narrowed particle size distribution for the catalyst particles in contrast to commercial benchmark catalysts (Umicore PtCo/C 30 and 50 wt%). Only about 10 % of the mass fraction of PtCo particles show a diameter larger than 8 nm, whereas up to > 35 % for the reference systems. This directly results in a considerable increase in electrochemically active surface area (96 m² g-1 vs. < 70 m² g-1). In addition, a higher fraction of these finely distributed PtCo nanoparticles are anchored on the carbon surface compared to the industrial benchmarks where nanoparticles are located inside the carbon pores. Single-cell tests confirm this finding by a significantly improved performance, especially at high current densities (~ 1 W cm-2 at 0.55 V under H2/air, 50 % RH, 250 kPaabs) and even with lower Pt loading (0.25 mgPt cm-2) compared to the commercial reference (< 0.9 W cm-2 at the same potential and the given conditions) with a higher Pt loading (0.4 mgPt cm-2). Lastly, reducing the cathode catalyst loading from 0.4 to 0.25 mg cm-² resulted in a power density drop at application-relevant 0.7 V of only 4 % for the novel catalyst, compared to the 10 % and 20 % for the Umicore reference catalysts with 30 wt% and 50 wt% PtCo on carbon.

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Highly Active Carbon Supported PtCu Electrocatalysts for PEMFCs by in situ Supercritical Deposition Coupled with Electrochemical Dealloying

Cited by 22 publications

References 61 publications

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Organic aerogel as electro‐catalytic support in low‐temperature fuel cell

PtCo/C catalysts with narrow particle size distribution improve high current density operation in PEM fuel cells

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