Hydrogen Adsorption/Desorption Isotherms on Supported Platinum Nanoparticles Determined by <i>in‐situ</i> XAS and ΔXANES Analysis

Fujita, Masami; Yamamoto, Akira; Tsuchiya, Naoki; Yoshida, Hisao

doi:10.1002/cctc.202101709

Cited by 6 publications

(7 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure c, the absorption intensity around 11572–11575 eV was increased in the oxygen-deficient condition for the Pt–Fe/CZY catalyst. This change of XANES spectra corresponds to H 2 adsorption on the surface of Pt nanoparticles. , Pt–Fe/CZY was found to mitigate CO adsorption and promote H 2 adsorption, which is necessary for hydrogen oxidation reaction for the PAR system.…”

Section: Resultsmentioning

confidence: 94%

See 1 more Smart Citation

Development of Hydrogen Oxidation Reaction Catalysts to Overcome CO Poisoning and Elucidation of Reaction Mechanism

Inagawa,

Matsumura,

Taniguchi

et al. 2023

J. Phys. Chem. C

View full text Add to dashboard Cite

Passive autocatalytic recombiner (PAR) represents a potential technology for ensuring process safety in the hydrogen society. PARs function through the catalytic oxidation of generated or leaked hydrogen, facilitating its conversion into water and effectively mitigating the risk of hydrogen explosions. CO is recognized as a catalyst poison that hampers surface catalytic reactions. To investigate the negative effects of CO on the local structure of platinum metal nanoparticle catalysts during water formation, in situ and time-resolved X-ray absorption spectroscopy analyses were conducted. The results revealed that the Pt–Fe/CZY catalyst exhibited notable hydrogen oxidation activity even in the presence of CO. The enhanced performance can be attributed to the combined effects of Pt–Fe alloy composition and CZY support materials.

show abstract

Section: Resultsmentioning

confidence: 94%

“…This change of XANES spectra corresponds to H 2 adsorption on the surface of Pt nanoparticles. 25,26 Pt−Fe/ CZY was found to mitigate CO adsorption and promote H 2 adsorption, which is necessary for hydrogen oxidation reaction for the PAR system.…”

Section: Observation Of Adsorbed Species On the Surface Of Pt Nanopar...mentioning

confidence: 99%

Development of Hydrogen Oxidation Reaction Catalysts to Overcome CO Poisoning and Elucidation of Reaction Mechanism

Inagawa,

Matsumura,

Taniguchi

et al. 2023

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…In the XANES spectra, the X-ray absorption was partially attributed to the electronic transition from the occupied 2p orbital to the unoccupied 5d orbital of the Ir complex. By contrast, the dissociative adsorption of dihydrogen to the surface atoms in Pt metal nanoparticle systems shifts the white line of the Pt LIII edge to higherenergy regions 33,34 . This effect is attributed to the formation of the anti-bonding orbital in Pt-H bonding.…”

Section: Mechanistic Investigationmentioning

confidence: 94%

Novel aqueous flow battery using CO2 redox with a bifunctional homogeneous Ir catalyst

Kanega

Ishida

Sakai

et al. 2023

Preprint

View full text Add to dashboard Cite

To suppress CO2 emissions, technologies that incorporate CO2 capture, utilization, and storage are being actively developed. Particularly, batteries using CO2 redox reactions are one of the most promising systems that combine energy conversion and storage. However, the stoichiometric reactions of CO2 and metal restrict the CO2 storage capacity of previously proposed systems. Applying catalyst-mediated CO2 redox is expected to provide flexible control of the CO2 storage capacity without dependence on the metal content. Herein, we report novel aqueous flow battery using CO2–formate redox with a bifunctional homogeneous Ir catalyst. Using of an Ir catalyst bearing a 4-hydroxy-N-methylpicolinamidate ligand was demonstrated for 50 cycles, with a maximum discharge capacity of 1.5 Ah L-1, capacity decay of 0.20% cycle-1, and total turnover number of 3,500. Furthermore, as the design concept, the CO2 storage capacity of the catalyst-based flow battery was improved more than 1000 times compared to the previously proposed system.

show abstract

“…In accordance with the experimental outcomes, we can speculate that after the H 2 treatment, part of Pt−C and Pt−O bonds were removed, thus leading to a sample with higher crystallinity and metallic Pt content than PtFe_UN. 45 To further clarify the local structure of the catalysts, the extended X-ray absorption fine structure (EXAFS) signals for PtFe_UN and PtFe_H 2 were extracted and are shown in Figure 5, together with the corresponding Fourier transform (FT).…”

Section: Xasmentioning

confidence: 99%

Structure and Activity of Carbonyl Cluster-Derived PtFe Nanoparticles as Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

He,

Fracchia,

Coduri

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Rationally designing low-content Pt-based cathodic electrodes to effectively avoid the shortcomings of sluggish kinetics reactions in oxygen reduction reactions is still a hot topic. Herein, PtFe carbonyl cluster-derived nanoparticles were synthesized, supported on Vulcan via a wet impregnation method, and modified thermally under hydrogen to change the surface composition and morphology. The prepared electrocatalysts were characterized by electrochemical techniques and by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS) to investigate their structure and morphology. The electrochemical experiments indicated that PtFe nanoparticles, thermally treated under H 2 , showed a high real geometry surface area of 31.57 m 2 g −1 , almost 2 times higher than that for untreated samples. Remarkably, from Koutecky−Levich analysis and rotating ring disk electrode experiments, the oxygen reduction reaction follows a 4-electron transfer path, and all of the tested electrocatalyst powders showed good stability after 500 voltammetry cycles. The Tafel slope evidenced the better behavior of H 2 thermally treated powder because the electronic structure of these clusters has been modified by the treatment, thus probably changing the electronic density of the PtFe nanoparticles, as well as the oxygen affinity for the electrode.

show abstract

Hydrogen Adsorption/Desorption Isotherms on Supported Platinum Nanoparticles Determined by in‐situ XAS and ΔXANES Analysis

Cited by 6 publications

References 58 publications

Development of Hydrogen Oxidation Reaction Catalysts to Overcome CO Poisoning and Elucidation of Reaction Mechanism

Development of Hydrogen Oxidation Reaction Catalysts to Overcome CO Poisoning and Elucidation of Reaction Mechanism

Novel aqueous flow battery using CO2 redox with a bifunctional homogeneous Ir catalyst

Structure and Activity of Carbonyl Cluster-Derived PtFe Nanoparticles as Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Contact Info

Product

Resources

About