Rhodium-modified gold polycrystalline surface as anode material in alkaline medium: An electrochemical and XPS investigation

Casella, Innocenzo G.; Contursi, Michela

doi:10.1016/j.jelechem.2007.04.009

Cited by 19 publications

(12 citation statements)

References 43 publications

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“…4, in which the experimental curve was fitted with two doublets. A component at a binding energy approaching 84.0 eV can be assigned to metallic gold [39,40]. The other component at 85.1 eV corresponded to chemically bonded Au + species [41][42][43], which suggested the Au atoms on the surface of AuNPs bonded with O species partly.…”

Section: Resultsmentioning

confidence: 98%

Synthesis of Au/C catalyst with high electrooxidation activity

Yan

Gao

Zhang

et al. 2013

Electrochimica Acta

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Section: Resultsmentioning

confidence: 98%

Synthesis of Au/C catalyst with high electrooxidation activity

Yan

Gao

Zhang

et al. 2013

Electrochimica Acta

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“…Furthermore, the Rh 3d 3d 5/2 peak of Au@mRh NWs positively shifts by 0.17 eV compared with that of the mRh NSs. This is because the higher work function of Au (5.1 eV) than that of Rh (4.98 eV) causes electron transfer from the Rh atom to the Au atom . This phenomenon reflects the strong electronic effect in Au@mRh NWs.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Bimetallic Au@Rh Core–Shell Nanowires as Efficient Electrocatalysts for pH-Universal Hydrogen Evolution

Wang

Jiao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Electrochemical water splitting is one hopeful strategy for hydrogen production, and designing efficient hydrogen evolution electrocatalysts under universal pH is one of the most critical topics. Here, we have successfully prepared mesoporous bimetallic core–shell nanostructures with Au nanowires (Au NWs) as cores and mesoporous Rh as shells (Au@mRh NWs). Due to the one-dimensional structure and mesoporous core–shell structure, Au@mRh NWs possess more active sites and provide the synergistic effect, leading to the great improvement of the electrochemical activity toward the hydrogen evolution reaction under a wide range of pH. The present work proposes a versatile strategy for preparing a bimetallic core–shell structure with a mesoporous shell, which is highly promising for more electrocatalytic applications.

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“…It was demonstrated in numerous cases that even bulk immiscible metals can form surface alloys like Au with Ni, [2][3][4][5][6] Ag with Cu, [7][8][9] as well as Au with Fe. 10,11 According to literature data, Au and Rh are also practically immiscible in bulk: the dissolution of Rh in Au, and that of Au in Rh is very limited, below 1% in the temperature range of 300-1200 K. 12 The combination of these metals proved to be beneficial in visible-light-induced hydrogen generation from water, 13,14 in the electrochemical oxygen evolution reaction, 15 in selective hydrogenation of cinnamaldehyde, 16 as well as in the hydroconversion of tetralin. 17 The mixing and segregation properties of these metals restricted to the nanoscale were previously studied in detail.…”

Section: Introductionmentioning

confidence: 99%

“…According to literature data, Au and Rh are also practically immiscible in bulk: the dissolution of Rh in Au and that of Au in Rh is very limited, below 1% in the temperature range of 300–1200 K . The combination of these metals proved to be beneficial in visible-light-induced hydrogen generation from water, , in the electrochemical oxygen evolution reaction, in selective hydrogenation of cinnamaldehyde, as well as in the hydroconversion of tetralin . The mixing and segregation properties of these metals restricted to the nanoscale were previously studied in detail. − In a number of studies Au and Rh were sequentially evaporated by physical vapor deposition (PVD) on oxide single crystalline surfaces. ,,,,, When first Au nanoparticles were prepared on a rutile TiO 2 (110) surface followed by evaporation of Rh, an efficient place exchange already occurred at room temperature, leading to the incorporation of a great part of Rh atoms into the subsurface of Au clusters, while the outermost layer still mostly consisted of gold .…”

Section: Introductionmentioning

confidence: 99%

Au–Rh Surface Structures on Rh(111): DFT Insights into the Formation of an Ordered Surface Alloy

et al. 2018

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Surface alloying is an important technique to change their chemical properties. In this study, by employing density functional theory (DFT) calculations, the atomic arrangements and energetics of an extensive set of Au-Rh structures in a confined (2×1) surface cell on a Rh(111) substrate are investigated. An ordered surface alloy layer composed of 50% Au and 50% Rh is identified as the energetically favored structure, which corresponds to a configuration proposed previously based on scanning tunneling microscopy (STM) imaging [Óvári et al. PCCP, 2016, 18, 25230]. Comparing this surface alloy with another candidate structure in terms of Rh and Au adsorption characteristics, the bonding preference among Rh and Au species is recovered. DFT-based simulated STM images reveal bias-voltage-dependent contrast differences among selected corrugated surface layer structures at various Au coverages. Furthermore, several new experimental results obtained by STM and low energy ion scattering (LEIS) on the thermally induced formation of the ordered Au-Rh surface alloy are also presented in this work. Our calculation approach and results are expected to contribute to the understanding of the formation of metallic surface alloys of various chemical compositions.

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Rhodium-modified gold polycrystalline surface as anode material in alkaline medium: An electrochemical and XPS investigation

Cited by 19 publications

References 43 publications

Synthesis of Au/C catalyst with high electrooxidation activity

Synthesis of Au/C catalyst with high electrooxidation activity

Mesoporous Bimetallic Au@Rh Core–Shell Nanowires as Efficient Electrocatalysts for pH-Universal Hydrogen Evolution

Au–Rh Surface Structures on Rh(111): DFT Insights into the Formation of an Ordered Surface Alloy

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