Self-supported Pt–CoO networks combining high specific activity with high surface area for oxygen reduction

Sievers, Gustav; Jensen, Annie Aarup; Quinson, Jonathan; Zana, Alessandro; Bizzotto, Francesco; Oezaslan, Mehtap; Dworzak, Alexandra; Kirkensgaard, Jacob J. K.; Smitshuysen, Thomas E. L.; Kadkhodazadeh, Shima; Juelsholt, Mikkel; Jensen, Kirsten M. Ø.; Anklam, Kirsten; Wan, Hao; Schäfer, Jan; Čépe, Klára; Escudero-Escribano, Marı́a; Rossmeisl, Jan; Quade, Antje; Brüser, Volker; Arenz, Matthias

doi:10.1038/s41563-020-0775-8

Cited by 169 publications

(122 citation statements)

References 48 publications

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“…At the pores the catalyst, electrolyte and the gas phase form three‐phase boundaries where fast access of protons as well as of oxygen is achieved [13,14] . Closer to the situation within a fuel cell is the so called gas diffusion electrode approach, where instead of a porous substrate a suitable membrane, such as a Nafion membrane is used, upon which the catalyst layer and gas diffusion layer are placed [20,23,24] …”

Section: Introductionmentioning

confidence: 99%

Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers

Zhong

Schulz²,

Wu³

et al. 2021

ChemElectroChem

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The oxygen reduction reaction (ORR) under ultrathin electrolyte layers is a key reaction in many processes, from atmospheric corrosion to energy conversion in fuel cells. However, the ORR current under ultrathin electrolyte layers is difficult to measure using conventional electrochemical methods. Hence, reliable data are scarce for the micrometer range and totally missing for the sub‐micrometer range of the electrolyte layer thickness. Here, we report a novel hydrogen‐permeation‐based approach to measure the ORR current underneath thin and ultrathin electrolyte layers. By using a Kelvin‐probe‐based measurement of the potential, which results from dynamic equilibrium of oxygen reduction and hydrogen oxidation, and the corresponding hydrogen charging current density, the full current‐potential relationship can be constructed. The results shed a new light on the nature of the limiting current density of ORR underneath ultrathin layers of electrolyte.

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Section: Introductionmentioning

confidence: 99%

Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers

Zhong

Schulz²,

Wu³

et al. 2021

ChemElectroChem

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“…It is worth noting that Arenz et al presented a breakthrough concept for a self-supported Pt–CoO catalyst capable of combining high specific activity with an unprecedentedly high ECSA. 16 However, it is still essential to control the shape of platinum NPs for fuel cell applications.…”

Section: Introductionmentioning

confidence: 99%

In Situ Small-Angle X-ray Scattering Studies on the Growth Mechanism of Anisotropic Platinum Nanoparticles

et al. 2021

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Shape-controlled platinum nanoparticles exhibit extremely high oxygen reduction activity. Platinum nanoparticles were synthesized by the reduction of a platinum complex in the presence of a soft template formed by organic surfactants in oleylamine. The formation of platinum nanoparticles was investigated using in situ small-angle X-ray scattering experiments. Time-resolved measurements revealed that different particle shapes appeared during the reaction. After the nuclei were generated, they grew into anisotropic rod-shaped nanoparticles. The shape, size, number density, reaction yield, and specific surface area of the nanoparticles were successfully determined using small-angle X-ray scattering profiles. Anisotropic platinum nanoparticles appeared at a low reaction temperature (∼100 °C) after a short reaction time (∼30 min). The aspect ratio of these platinum nanoparticles was correlated with the local packing motifs of the surfactant molecules and their stability. Our findings suggest that the interfacial structure between the surfactant and platinum nuclei can be important as a controlling factor for tailoring the aspect ratio of platinum nanoparticles and further optimizing the fuel cell performance.

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“…For these conversion technologies a fundamental understanding and rational design of electrocatalysts, on which the surface reactions of interest take place, are essential 3 . In state-of-the-art academic electrocatalyst design, typically the focus is on optimizing the surface structure of the catalyst on a nanometer or even atomic scale [4][5][6][7][8][9][10] . This approach led to the development of several highly performing electrocatalyst concepts in research, nevertheless, their implementation into realistic conversion devices is not straightforward 11 .…”

Section: Introductionmentioning

confidence: 99%

The Oxygen Reduction Reaction on Pt: Why Particle Size and Inter-particle Distance Matter

Inaba¹,

Zana²,

Quinson³

et al. 2021

Preprint

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<p>Carbon supported Pt based nanoparticles are important electrocatalysts for energy conversion reactions such as the oxygen reduction reaction (ORR). Although this reaction has been extensively studied, the influence of factors such as the particle size and inter-particle distance of the nanoparticle-based or nano-sized electrocatalysts on the ORR activity and durability are not yet fully understood and often intertwined. This lack of understanding is mostly based on the limitation in the synthetic approaches of the electrocatalysts which usually do not allow an independent variation of particle size and inter-particle distance. In the presented work, we succeeded to disentangle both factors using a “colloidal toolbox” approach and have demonstrated an effect of the inter-particle distance on the electronic properties of the nanoparticle via <i>operando</i> electrochemical X-ray absorption spectroscopy (XAS). </p>

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Self-supported Pt–CoO networks combining high specific activity with high surface area for oxygen reduction

Cited by 169 publications

References 48 publications

Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers

Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers

In Situ Small-Angle X-ray Scattering Studies on the Growth Mechanism of Anisotropic Platinum Nanoparticles

The Oxygen Reduction Reaction on Pt: Why Particle Size and Inter-particle Distance Matter

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