Anisotropy of Pt nanoparticles on carbon- and oxide-support and their structural response to electrochemical oxidation probed by <i>in situ</i> techniques

Schmies, Henrike; Bergmann, Arno; Hornberger, Elisabeth; Drnec, Jakub; Wang, Guanxiong; Dionigi, Fabio; Kühl, Stefanie; Sandbeck, Daniel J. S.; Mayrhofer, Karl Johann Jakob; Ramani, Vijay; Cherevko, Serhiy; Strasser, Peter

doi:10.1039/d0cp03233f

Cited by 10 publications

(8 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak of CoSe oxidation was observed at ca. 0.9 V versus saturated calomel electrode (SCE), which was lower than the potential of Pt oxidation (above 1.2 V), , indicating the more facile adsorption and formation of oxygen-containing species. The methanol oxidation performance was evaluated by the cyclic voltammetry (CV) technique in the electrolyte of 0.5 M H 2 SO 4 and 1.0 M CH 3 OH at a scan rate of 50 mV s –1 (Figure a).…”

Section: Resultsmentioning

confidence: 90%

PtIr Alloy Nanoparticles Anchored on CoSe–NC Nanospheres for Efficient Methanol Oxidation

et al. 2023

View full text Add to dashboard Cite

Efficient catalysts are still required for methanol oxidation, which plays an important role in the sustainable carbon cycle. Herein, a novel and efficient catalyst of PtIr alloy nanoparticles deposited on the CoSe–NC support derived from ZIF-67 was developed for methanol electro-oxidation. The well-anchored and dispersed PtIr alloy nanoparticles over the CoSe–NC support imparted a strong electronic interaction between the support and the active metals, and as a result, the as-prepared PtIr/CoSe–NC catalyst showed largely improved catalytic kinetics, stability, and activity for the methanol oxidation reaction. The peak current density of PtIr/CoSe–NC for methanol oxidation was 56.7 mA cm–2, around 2.1 times higher than that of a commercial Pt/C (26.6 mA cm–2) catalyst, by loading on the glassy carbon electrode. Moreover, high anti-CO-poisoning ability was also found in the PtIr/CoSe–NC catalyst by comparing it to the PtIr/C catalyst. The great combination effect of the CoSe–NC support and PtIr active metal alloy would be helpful and instructive for other novel catalyst system development.

show abstract

Section: Resultsmentioning

confidence: 90%

PtIr Alloy Nanoparticles Anchored on CoSe–NC Nanospheres for Efficient Methanol Oxidation

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Schmies et al used this approach to better describe the anisotropic ellipsoidal shape of Pt nanocrystallites synthesized on various carbon or oxide support materials, and could correlate in situ the shape of the particles with their resistance to oxidation and dissolution. 458 A more versatile description of the particle shape is possible with SAXS. Using a model of hollow nanoparticles to fit SAXS data, Asset et al could monitor in situ the shape evolution of hollow PtNi/C nanoparticles during mild and harsh accelerated stress tests.…”

Section: Platinum Group Metal Based Single Crystalsmentioning

confidence: 99%

In Situ and Operando X-ray Scattering Methods in Electrochemistry and Electrocatalysis

Magnussen,

Drnec,

Qiu

et al. 2024

Chem. Rev.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the signal-to-noise ratio, it is difficult to inspect the nucleation/coalescence phase (few nanometers) using traditional XRD. To analyze small crystalline grains, two strategies can be followed, one is to use a high-energy (HE)-XRD, [122,123] and another is to extend the dwell time during data collection. However, the latter approach is not desired as it makes in situ analysis difficult to perform.…”

Section: Morphologymentioning

confidence: 99%

Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Pinho

Zhang

Hoye

et al. 2022

Advanced Optical Materials

View full text Add to dashboard Cite

Reducing the dimensionality of materials from bulk thin films and single crystals to nanocrystals (NCs) and quantum dots This review paper analyzes the importance of monitoring the synthesis of plasmonic and optoelectronic materials to provide a mechanistic understanding of their nucleatiçon and growth, as well as crucial kinetic insights to enable their future development. Light-interacting nanoparticles present strong size-property relationships, such that size control is at the core of any synthetic development. However, conventional ex situ characterization of these materials has heavily limited their development to simple trial-and-error approaches. Over the last decade, the development of in situ and online characterization capabilities has transformed the understanding of mechanistic models. In addition, time-resolved data are able to reveal the step rate, even for phenomena taking place in the microsecond timescale (i.e., nucleation), thanks to the use of micro-flow-reactors. However, the literature contains a few disagreements and inaccuracies, which are considered to be due to the general lack of attention and control on mixing (relevant when mixing time is comparable to the reaction time), and the presence of additives during synthesis (e.g., stabilizers). Finally, it is believed that recent in situ monitoring development coupled with reactor design brings unique opportunities to not only synthesize nanoparticles in a reproducible and controllable manner, but also gives data-rich approaches for self-regulated and automated systems.

show abstract

Anisotropy of Pt nanoparticles on carbon- and oxide-support and their structural response to electrochemical oxidation probed by in situ techniques

Abstract: Identifying the structural response of nanoparticle-support ensembles to the reaction conditions is essential to determine their structure in the catalytically-active state as well as to unravel possible degradation pathways. In...

Cited by 10 publications

References 60 publications

PtIr Alloy Nanoparticles Anchored on CoSe–NC Nanospheres for Efficient Methanol Oxidation

PtIr Alloy Nanoparticles Anchored on CoSe–NC Nanospheres for Efficient Methanol Oxidation

In Situ and Operando X-ray Scattering Methods in Electrochemistry and Electrocatalysis

Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Contact Info

Product

Resources

About