Operando Time-Resolved X-ray Absorption Fine Structure Study for Pt Oxidation Kinetics on Pt/C and Pt<sub>3</sub>Co/C Cathode Catalysts by Polymer Electrolyte Fuel Cell Voltage Operation Synchronized with Rapid O<sub>2</sub> Exposure

Ozawa, Saki; Matsui, H.; Ishiguro, Nozomu; Tan, Yuanyuan; Maejima, Naoyuki; Taguchi, Masahiro; Uruga, Tomoya; Sekizawa, Oki; Sakata, Tomomi; Higashi, Kõtarõ; Tada, Mizuki

doi:10.1021/acs.jpcc.8b02541

Cited by 22 publications

(12 citation statements)

References 45 publications

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“…It should be noted that the white line for A-Pt greatly increased at 0.9–1.0 V vs RDE, which corresponds to the potential region of Pt surface oxidation, whereas that for A-Pt-Gd(5/1) did not increase at the same potential. These results strongly support the hypothesis that the addition of Gd inhibited oxidation of the Pt nanoparticles, which would be expected to enhance the rates of Pt–O bond formation and cleavage on the Pt surface , and thus improve the ORR activity.…”

Section: Resultssupporting

confidence: 84%

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

et al. 2020

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Fine Pt nanoparticles functionalized with Gd 3+ hydroxide/oxide species were prepared on multiwalled carbon nanotubes (MWCNTs) containing polypyrrole matrix overlayers and found to exhibit remarkable electrocatalytic performance in the oxygen reduction reaction (ORR). Characterization via transmission electron microscopy, scanning transmission electron microscopy with electron energy loss spectroscopy, X-ray absorption fine structure, and X-ray photoelectron spectroscopy revealed that the Gd 3+ hydroxide/oxide species were located in close proximity to the Pt 0 nanoparticles on the MWCNTs. The prepared Pt nanoparticle−Gd hydroxide/oxide composites exhibited superior ORR activity to Gd-free Pt nanoparticles prepared in a similar manner, and the decoration with the Gd species suppressed Pt oxidation and accelerated Pt oxide reduction, as demonstrated by cyclic voltammetry and in situ Pt L III -edge X-ray absorption near-edge structure analysis under potential application. The effect of the Gd loading on the ORR performance was also examined, revealing the existence of an optimal Gd loading beyond which further Gd incorporation resulted in aggregation of the Gd 3+ domains and decreased crystallinity of the Pt nanoparticles.

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Section: Resultssupporting

confidence: 84%

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

et al. 2020

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“…Quick XAS can achieve 10-ms time resolution and can be applied to study dynamic or kinetic states in chemical and electrochemical reactions such as high rate delithiation behavior and nucleation process of nanoparticles [ 89 , 90 ]. Currently, the quick X-ray absorption spectroscopy has also been used in the electrocatalysis field to resolve the reconstruction of the catalysts within several seconds [ 91 , 92 ]. Pump-and-probe spectroscopy studies ultrafast electronic dynamics.…”

Section: Other Xas Applicationsmentioning

confidence: 99%

In Situ X-ray Absorption Spectroscopy Studies of Nanoscale Electrocatalysts

et al. 2019

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HIGHLIGHTS • This is the first review paper on the studies of electrocatalysts using advanced in situ X-ray absorption spectroscopy (XAS). • This paper reviews the literatures to-date on new applications of in situ XAS (e.g., single-atom catalysts, surface reactions, nanoparticle size, and site occupation) that traditional XAS has not touched. • This review focuses mostly on recent publications after 2010.

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“…X-ray Computed Laminography (XCL) [140,141] has also proven to be a useful method of analysis; Saida et al [142] demonstrated the use of XCL in combination with X-ray Absorption Fine Structure (XAFS) [143] in the form of Laminography -XAFS to examine the cathode CL in 4D exposing Pt distribution before and after degradation. XAFS has also been demonstrated operando by Ozawa et al [144] who utilised this technique to explore the rate of Pt-O bond formation with potential. Recently, Yu et al demonstrated the use of Hard X-ray Photoelectron Spectroscopy (HAXPES) in order to examine sulphur poisoning of such Pt CLs [145].…”

Section: Figurementioning

confidence: 99%

Developments in X-ray tomography characterization for electrochemical devices

et al. 2019

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Over the last century, X-ray imaging instruments and their accompanying tomographic reconstruction algorithms have developed considerably. With improved tomogram quality and resolution, voxel sizes down to tens of nanometres can now be achieved. Moreover, recent advancements in readily accessible lab-based X-ray computed tomography (X-ray CT) instruments have produced spatial resolutions comparable to specialist synchrotron facilities. Electrochemical energy conversion devices, such as fuel cells and batteries, have inherently complex electrode microstructures to achieve competitive power delivery for consideration as replacements for conventional sources. With resolution capabilities spanning tens of microns to tens of nanometres, X-ray CT has become widely employed in the three-dimensional (3D) characterisation of electrochemical materials. The ability to perform multiscale imaging has enabled characterisation from system-down to particle-level, with the ability to resolve critical features within device microstructures. X-ray characterisation presents a favourable alternative to other 3D methods such as focused ion beam scanning electron microscopy, due to its non-destructive nature, which allows four-dimensional (4D) studies, three spatial dimensions plus time, linking structural dynamics to device performance and lifetime. X-ray CT has accelerated research from fundamental understanding of the links between cell structure and performance, to the improvement in manufacturing and scale-up of full electrochemical cells. Furthermore, this has aided in the mitigation of degradation and celllevel failures such as thermal runaway. This review presents recent developments in the use of X-ray CT as a characterisation method and its role in the advancement of electrochemical materials engineering.

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Operando Time-Resolved X-ray Absorption Fine Structure Study for Pt Oxidation Kinetics on Pt/C and Pt₃Co/C Cathode Catalysts by Polymer Electrolyte Fuel Cell Voltage Operation Synchronized with Rapid O₂ Exposure

Cited by 22 publications

References 45 publications

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

In Situ X-ray Absorption Spectroscopy Studies of Nanoscale Electrocatalysts

Developments in X-ray tomography characterization for electrochemical devices

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Operando Time-Resolved X-ray Absorption Fine Structure Study for Pt Oxidation Kinetics on Pt/C and Pt3Co/C Cathode Catalysts by Polymer Electrolyte Fuel Cell Voltage Operation Synchronized with Rapid O2 Exposure

Cited by 22 publications

References 45 publications

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

In Situ X-ray Absorption Spectroscopy Studies of Nanoscale Electrocatalysts

Developments in X-ray tomography characterization for electrochemical devices

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Product

Resources

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Operando Time-Resolved X-ray Absorption Fine Structure Study for Pt Oxidation Kinetics on Pt/C and Pt₃Co/C Cathode Catalysts by Polymer Electrolyte Fuel Cell Voltage Operation Synchronized with Rapid O₂ Exposure