Carbon materials as additives to the OER catalysts: RRDE study of carbon corrosion at high anodic potentials

Filimonenkov, Ivan S.; Bouillet, Corinne; Kéranguéven, Gwénaëlle; Simonov, P.A.; Tsirlina, Galina A.; Savinova, Elena R.

doi:10.1016/j.electacta.2019.134657

Cited by 64 publications

(46 citation statements)

References 55 publications

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“…This value is better than the current work, however, this can be attributed to the presence of expensive Pt in the samples with platinum-based catalysts still being the best ORR catalysts to date. Laser-generated PdY NPs also show better ORR activity than the HEMG NPs here due to the higher activity associated with Pd [102].…”

Section: Resultsmentioning

confidence: 81%

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

Johny

Kamp

et al. 2021

Nano Res.

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High entropy metallic glass nanoparticles (HEMG NPs) are very promising materials for energy conversion due to the wide tuning possibilities of electrochemical potentials offered by their multimetallic character combined with an amorphous structure. Up until now, the generation of these HEMG NPs involved tedious synthesis procedures where the generated particles were only available on highly specialized supports, which limited their widespread use. Hence, more flexible synthetic approaches to obtain colloidal HEMG NPs for applications in energy conversion and storage are highly desirable. We utilized pulsed laser ablation of bulk high entropy alloy targets in acetonitrile to generate colloidal carbon-coated CrCoFeNiMn and CrCoFeNiMnMo HEMG NPs. An in-depth analysis of the structure and elemental distribution of the obtained nanoparticles down to single-particle levels using advanced transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) methods revealed amorphous quinary and senary alloy phases with slight manganese oxide/hydroxide surface segregation, which were stabilized within graphitic shells. Studies on the catalytic activity of the corresponding carbon-HEMG NPs during oxygen evolution and oxygen reduction reactions revealed an elevated activity upon the incorporation of moderate amounts of Mo into the amorphous alloy, probably due to the defect generation by atomic size mismatch. Furthermore, we demonstrate the superiority of these carbon-HEMG NPs over their crystalline analogies and highlight the suitability of these amorphous multi-elemental NPs in electrocatalytic energy conversion.

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Section: Resultsmentioning

confidence: 81%

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

Johny

Kamp

et al. 2021

Nano Res.

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“…In addition, the current measured for a perovskite/carbon composite includes both the OER activity of the composite as well as the current of carbon oxidation . Interestingly, some metal oxides and perovskites in carbon composites have been shown to influence the rate of carbon corrosion at OER potentials compared with carbon alone. − In order to avoid carbon stability issues and measure the intrinsic OER activity of the perovskite, it is necessary to remove carbon from the electrode. Without carbon, the perovskite electrode may suffer from high resistances and low performance.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

Perovskite Oxide Based Electrodes for the Oxygen Reduction and Evolution Reactions: The Underlying Mechanism

2021

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One hindrance to the development of fuel cells and electrolyzers are the oxygen electrodes, which suffer from high overpotentials and slow kinetics. Perovskite oxides have been shown to be promising oxygen electrode catalysts because of their low cost, flexibility, and tailorable properties. In order to improve perovskite catalysts for the oxygen reduction (ORR) and oxygen evolution (OER) reactions, a better understanding of their reaction mechanisms is needed. This Perspective aims to inform researchers of the current proposed reaction mechanisms for ORR and OER on perovskites and perovskite/carbon composites in order to guide future catalyst development. Additionally, important experimental practices will be recommended. A recent development for OER is the lattice oxygen evolution reaction, which is a possible addition to the conventional four consecutive proton-coupled electron transfer mechanism. Carbon additives are consistently added to perovskites to enhance conductivity and ORR/OER activity. However, carbon plays an active role in ORR, and there is evidence of a synergistic relationship between perovskite and carbon in perovskite/carbon composites.

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“…These processes change the composition of the cell, which is undesirable for a device meant to be functioning solely as a capacitor. Furthermore, such processes could lead to catastrophic breakdown of the device because a conducting material can be irreversibly oxidised, resulting in material loss due to electrodissolution [105][106][107][108][109] , formation of a poorly conducting film in the case of a metal electrode 110,111 , or the evolution of gaseous products, e.g. CO 2 , in the case of a carbon electrode 112,113 .…”

Section: Experimental Data On the Graphene-electrolyte Capacitancementioning

confidence: 99%

The electrochemical double layer at the graphene/aqueous electrolyte interface: what we can learn from simulations, experiments, and theory

et al. 2022

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Carbon materials as additives to the OER catalysts: RRDE study of carbon corrosion at high anodic potentials

Cited by 64 publications

References 55 publications

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

Perovskite Oxide Based Electrodes for the Oxygen Reduction and Evolution Reactions: The Underlying Mechanism

The electrochemical double layer at the graphene/aqueous electrolyte interface: what we can learn from simulations, experiments, and theory

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