Pd–Pt alloys: correlation between electronic structure and hydrogenation properties

Moysan, I.; Paul‐Boncour, V.; Thiébaut, S.; Sciora, E.; Fournier, Jean‐Marc; Cortès, R.; Bourgeois, S.; Percheron-Guégan, A.

doi:10.1016/s0925-8388(01)01202-6

Cited by 49 publications

(47 citation statements)

References 11 publications

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“…The magnetization of Pd 0:92 -Pt 0:08 is 70% that of Pd. This agrees well with the observations by Moysan et al 20) The magnetic susceptibility of both samples decreased with increasing hydrogen content. For Pd hydride, the magnetic susceptibility fell down to zero at [H]/[Pd] ¼ 0:6.…”

Section: Glass Beadssupporting

confidence: 93%

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Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

et al. 2006

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Magnetic properties of palladium and palladium-platinum alloy (Pd-Pt) of different hydrogen content were measured in a hydrogen atmosphere at ambient temperature using a superconducting quantum interference device (SQUID) magnetometer. It was found that the magnetic susceptibility of Pd and Pd-Pt alloy decreased with increasing hydrogen content. These results were attributed to a change in the electronic structure of the valence band. Increasing hydrogen content in Pd and Pd-Pt alloy causes the Fermi level to rise and the density of states at Fermi level to decrease. Since the magnetic susceptibility is proportional to the density of states at the Fermi level, the magnetic susceptibility decreases with increasing hydrogen content. The magnetic susceptibility of Pd-Pt was smaller than that of Pd over the whole hydrogen content range. This was ascribed to the higher position of the Fermi level of Pd-Pt than that of Pd.

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Section: Glass Beadssupporting

confidence: 93%

“…These hydrogen contents are consistent with the termination of plateau regions on pressure-composition isotherms. 18,20) …”

Section: Glass Beadsmentioning

confidence: 99%

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

et al. 2006

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“…In regard to other types of alloys, e.g., Pd-Au [20,[36][37][38] or Pd-Pt [21,34,[39][40][41], the Pd-Rh system demonstrates a very unusual hydrogen absorption behavior. With the addition of a small amount of Rh the maximum alloy absorption capacity in the β phase increases [4][5][6][7][8][9].…”

Section: Resultsmentioning

confidence: 99%

Influence of rhodium additive on hydrogen electrosorption in palladium-rich Pd–Rh alloys

Koss

Łukaszewski

Hubkowska

et al. 2011

J Solid State Electrochem

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Hydrogen electrosorption into Pd-rich (>80 at.% Pd in the bulk) Pd-Rh alloys has been studied in acidic solutions (0.5 M H 2 SO 4 ) using cyclic voltammetry and chronoamperometry. The influence of temperature (in the range between 283 and 328 K), electrode potential and alloy bulk composition on hydrogen electrosorption properties of Pd-Rh alloys is presented. It has been found that the additive of Rh to Pd-Rh alloys increases the maximum hydrogen solubility (for Rh bulk content below 10 at.%), decreases the potential of absorbed hydrogen oxidation peak and decreases the potential of the α→β phase transition. Increasing temperature decreases the potential of absorbed hydrogen oxidation peak, the maximum hydrogen solubility, and the potential of the α→β phase transition. The amounts of electrosorbed hydrogen for α-and β-phase boundaries, i.e., α max and β min , have been determined from the integration of the initial parts of current-time responses in hydrogen absorption and desorption processes. The H/M ratio corresponding to α max increases with increasing Rh content, while for β min a maximum of H/M ratio is observed for the alloys containing ca. 95% Rh.

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“…Moreover, as a result of the different work functions of Pt and Pd, electron migration can happen between closely contacted Pt and Pd clusters, which thereby leads to the formation of relatively positively charged Pt sites (electron deficient) and negatively charged Pd sites (electron redundant) on the surface of the Pd-Pt alloy particles. [20][21][22] Such heterogeneity of the surface electron distribution can positively contribute to enhanced catalytic activity. [23,24] Therefore, the Pd-Pt alloy is apparently a suitable cocatalyst for titania to realize photocatalytic transfer hydrogenation reactions efficiently.…”

mentioning

confidence: 99%

Titania‐Photocatalyzed Transfer Hydrogenation Reactions with Methanol as a Hydrogen Source: Enhanced Catalytic Performance by Pd–Pt Alloy at Ambient Temperature

Zhao

Pan

et al. 2014

ChemCatChem

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Hydrogenation reactions are of great importance in scientific research and in industry productions. Herein, we designed a novel system to realize photocatalytic transfer hydrogenation by using solar light as the energy input and methanol as the hydrogen source. In this reaction, titania loaded with Pd–Pt bimetallic alloy nanocrystals as a cocatalyst exhibited photocatalytic performance that was remarkably superior to that exhibited by titania with Pd or Pt alone as the cocatalyst. This work has shed light on the rational design of multifunctional catalysts through selecting appropriate bimetallic alloys as efficient cocatalysts.

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Pd–Pt alloys: correlation between electronic structure and hydrogenation properties

Cited by 49 publications

References 11 publications

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

Influence of rhodium additive on hydrogen electrosorption in palladium-rich Pd–Rh alloys

Titania‐Photocatalyzed Transfer Hydrogenation Reactions with Methanol as a Hydrogen Source: Enhanced Catalytic Performance by Pd–Pt Alloy at Ambient Temperature

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Pd–Pt alloys: correlation between electronic structure and hydrogenation properties

Cited by 49 publications

References 11 publications

Magnetic Properties of Palladium and Palladium&ndash;Platinum Alloy of Various Hydrogen Content

Magnetic Properties of Palladium and Palladium&ndash;Platinum Alloy of Various Hydrogen Content

Influence of rhodium additive on hydrogen electrosorption in palladium-rich Pd–Rh alloys

Titania‐Photocatalyzed Transfer Hydrogenation Reactions with Methanol as a Hydrogen Source: Enhanced Catalytic Performance by Pd–Pt Alloy at Ambient Temperature

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Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content