Surface X-ray Scattering of Pd(110) and Pd(311) in Electrochemical Environments

Hoshi, Nagahiro; Naito, Keita; Nakamura, Masashi; Sakata, Osami

doi:10.5796/electrochemistry.82.351

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…In situ surface X-ray scattering (SXS) analysis showed that the Pd single crystal electrodes have (1 © 1) structures. 16,17 Figures 2(d)-2(f ) show voltammograms of the low-index plane in 0.05 M KOH saturated with Ar. The anodic peak at 0.5 V (vs. RHE) of Pd(100) is due to the release of the absorbed hydrogen, and the other anodic peak is due to oxide formation.…”

Section: Liohmentioning

confidence: 99%

Cation Effects on ORR Activity on Low-index Planes of Pd in Alkaline Solution

2021

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The oxygen reduction reaction (ORR) has been studied on low-index planes of Pd in 0.05 M XOH (X = Li, Na, K, and Cs) solutions to determine the effects of cations on ORR activity. The order of ORR activity is Pd(110) < Pd(100) < Pd( 111) in all solutions. This order differs from that in HClO 4 : Pd(110) < Pd(111) B Pd(100). Cationic species do not affect the ORR activity on Pd(110) and Pd(100). In contrast, the ORR activity of Pd(111) increases in the order of Li + < Na + < K + < Cs + . The lower the cation hydration energy, the higher the ORR activity on Pd(111), as is also the case on Pt(111). The ORR activity of Pd(111) in CsOH is 1.8 times higher than that of Pd(100) in HClO 4 .

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Section: Liohmentioning

confidence: 99%

Cation Effects on ORR Activity on Low-index Planes of Pd in Alkaline Solution

2021

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“…These peaks are related to the adsorption/desorption of (bi)sulfate anions on the wide terrace according to the study of infrared reflection absorption spectroscopy (IRAS). 18 No redox peaks on Pd(110) are attributed to the narrow terrace width of Pd(110) (1 © 1) structure 19 where (bi)sulfate anions are hardly adsorbed at lower potentials. 18 The onset potential of anodic peak of Pd oxides formation increases as Pd(110) (0.85 V) < Pd(100) (0.90 V) < Pd(111) (1.1 V).…”

Section: Resultsmentioning

confidence: 99%

Structural Effects on Methanol Oxidation on Single Crystal Electrodes of Palladium

2017

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Methanol oxidation reaction (MOR) has been studied on the low index planes of Pd (Pd(111), Pd(100) and Pd (110)) in 0.1 M HClO 4 using voltammogram. Onset potential of methanol oxidation increases as Pd (110)~Pd(100) < Pd(111). The activity for the MOR is estimated using anodic peak current density of the voltammograms. The order of the activity is Pd(111)~Pd(110) B Pd(100): (100) surface enhances the activity for the MOR on Pd electrodes.

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“…31 Structures of adsorbed iodine were determined on Pd(111), Pd(100) and Pd(110) in 0.05 M H 2 SO 4 using STM, 32 however, real surface structures of bare Pd(100) and Pd(110) were not known in electrochemical environments. We determined real surface structures of Pd(111), Pd(100), Pd(110) 33 and Pd(311) 34 in 0.1 M HClO 4 using in-situ SXD. All the Pd surfaces examined have unreconstructed (1 © 1) structures.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

Hoshi

Nakamura

2018

Electrochemistry

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This headline article focuses on the oxygen reduction reaction (ORR), cathodic reaction of fuel cells, on well-defined high index planes of Pt and Pd for the elucidation of factors enhancing the activity for the ORR. The surfaces with (111) terrace edge have high activity for the ORR on Pt electrodes. Pt(331) = 3(111)- (111) gives the highest activity for the ORR in the stepped surfaces of Pt. Incorporation of one kink atom among eleven step atoms further enhances the activity of Pt(331). On single crystal electrodes of Pd, however, terrace edge deactivates the ORR and wide (100) terrace enhances the activity. Effects of Pt oxides (PtOH and PtO) on the ORR have been examined using vibrational spectroscopy. Infrared reflection absorption spectroscopy (IRAS) shows that PtOH prevents the ORR on Pt electrodes. Nanoparticle surface enhanced Raman spectroscopy (NPSERS) indicates that PtO also blocks the ORR on Pt(100) of which ORR activity is the lowest. The ORR activity of Pt is also enhanced by the modification of the surfaces by amines with long alkyl chains such as octylamine (OA) and amine with pyrene ring (PA). Modification by OA/PA increases the ORR activity on n(111)-(111) surfaces of Pt with terrace atomic rows more than 7. The activity of flat Pt(111) is enhanced most remarkably by OA/PA. However, the ORR of Pt(100), of which surface is also composed of flat terrace, is deactivated significantly.

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Surface X-ray Scattering of Pd(110) and Pd(311) in Electrochemical Environments

Abstract: (311) is larger than that of the bulk in both Ar and O 2 saturated solutions.

Cited by 6 publications

References 40 publications

Cation Effects on ORR Activity on Low-index Planes of Pd in Alkaline Solution

Cation Effects on ORR Activity on Low-index Planes of Pd in Alkaline Solution

Structural Effects on Methanol Oxidation on Single Crystal Electrodes of Palladium

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

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