Electrocatalytic behaviors of silver–palladium nanoalloys modified carbon ionic liquid electrode towards hydrogen evolution reaction

Safavi, Afsaneh; Kazemi, Sayed Habib; Kazemi, Hojjat

doi:10.1016/j.fuel.2013.10.016

Cited by 73 publications

(34 citation statements)

References 68 publications

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“…The obtained values suggest that the Volmer step is the rate-determining step (RDS) of the process. Tafel slope value deviations from the theoretical value of 0.120 V dec −1 for the Volmer step as the RDS [34] have been previously reported and explained by the mentioned absorption of hydrogen into the Pd bulk [2,35]. Additionally, it was observed that b values obtained at the three electrocatalysts increased with temperature, which is also reflected in a small decrease of α.…”

Section: Her Studiessupporting

confidence: 56%

“…One of the most promising alternatives to fossil fuels is hydrogen, as it has a large combustion heat (287 kJ mol −1 ) and the only waste produced by its consumption is water [2]. For this reason, extensive research has been carried out by scientists all over the world in order to make the production and storage technology for hydrogen as efficient as possible [3].…”

Section: Introductionmentioning

confidence: 99%

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Vine Shoots and Grape Stalks as Carbon Sources for Hydrogen Evolution Reaction Electrocatalyst Supports

et al. 2018

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Activated bio-based carbons produced from vine shoots (VSAC) and grape stalks (GSAC), which have larger surface area and total pore volume than most of the commercially available activated carbons, are used as supports for palladium nanoparticles (Pd NPs). The prepared materials are characterised by elemental analysis, N 2 -sorption, X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, and transmission electron microscopy analysis and are then assessed as potential cathodes for the hydrogen evolution reaction (HER) in alkaline media. The electrocatalysts' performance for HER is evaluated from cathodic polarisation curves at different temperatures and compared to that of Vulcan XC72-supported Pd NPs. Additional chronoamperometry studies helped to assess the electrocatalysts' activity stability. The novel VSAC-supported Pd electrocatalyst exhibits good HER activity in terms of high current density at low overpotentials, leading to the best performance.

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Section: Her Studiessupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Vine Shoots and Grape Stalks as Carbon Sources for Hydrogen Evolution Reaction Electrocatalyst Supports

et al. 2018

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“…7 and Fig. 8 90 found that similar Ag 0.2 Pd 0.8 NAs but with large sizes (35~50 nm) show the best activity toward HER in ionic liquid. However, their data on surface composition and structure are not enough to reveal the structure-activity relationship.…”

Section: Surface Ag Segregationmentioning

confidence: 74%

Surface Segregation and Chemical Ordering Patterns of Ag–Pd Nanoalloys: Energetic Factors, Nanoscale Effects, and Catalytic Implication

Tang

Deng

Deng³

et al. 2014

J. Phys. Chem. C

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We performed Monte Carlo simulations to determine the roles of energetic factors and nanoscale effects in the surface segregation and chemical ordering patterns of Ag-Pd nanoalloy particles.Ag atoms significantly segregate onto the surface and preferentially occupy the low-coordinated sites, which significantly reduce the surface and strain energies of the nanoalloys. The segregation isotherms reveal that surface Ag composition is enhanced with increasing particle size or Ag concentration to circumvent the finite matter effects. Chemical ordering favored by attractive hetero-bonds can coexist and compete with surface segregation. Accordingly, small and Pd-rich nanoalloys display a continuous transition from Pd-core/ mixing-shell to mixingcore/ Ag-shell, where an ordered core is absent as a result of surface segregation and limited Ag supply. By contrast, large nanoalloys with equimolar or Ag-rich concentration exhibit the strong core ordering characteristics of bulk alloys. Particularly, surface patterns with partially alloyed facets and Ag-blocked vertices and edges are formed. This study also discussed the effects of isolating and blocking surface Pd active sites by Ag on the hydrogen evolution reaction and selective hydrogenation of acetylene.

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“…15,16 Through alloying Ag with Pd and subsequently modifying it with ionic liquid, Safavi et al obtained improved electrocatalytic activity towards HER in comparison to pure Pd. 17 Likewise, alloying Pd with other noble and transition metals, active electrocatalysts 4 for HER were synthesized. 12,14,18,19 Amongst bimetallic alloy systems, Au-Pd alloy is an ideal candidate for HER.…”

Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide nanosheets decorated with Au, Pd and Au–Pd bimetallic nanoparticles as highly efficient catalysts for electrochemical hydrogen generation

et al. 2015

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Reduced graphene oxide (rGO) nanosheets decorated with gold nanoparticles (Au NPs/rGO), palladium nanoparticles (Pd NPs/rGO), and gold-palladium bimetallic nanoparticles (Au-Pd NPs)/rGO are synthesized by a simple solution chemistry approach using ascorbic acid as ecofriendly reducing agent. These materials are characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The as-prepared nanocomposites are tested as electrocatalysts for efficient hydrogen evolution in deaerated 0.5 M H 2 SO 4 aqueous solution using polarization and impedance measurements. Experimental findings show that the tested catalysts exhibit fast hydrogen evolution kinetics with onset potentials as low as −17, −7.2, and −0.8 mV vs. RHE for Au NPs/rGO, Pd NPs/rGO, and Au-Pd NPs/rGO, respectively. In addition, Tafel slopes of 39.2, 33.7 and 29.0 mV dec -1 and exchange current densities of 0.09, 0.11, and 0.47 mA cm -2 are measured for Au NPs/rGO, Pd NPs/rGO, and Au-Pd NPs/rGO, respectively. The tested materials not only maintain their high performance after 5000 sweep cycles, but their activity is simultaneously enhanced after this aging process. These findings reveal that the tested catalysts, particularly Au-Pd NPs/rGO, are promising candidates among other noble metal catalysts for hydrogen evolution, approaching the commercial Pt/C catalyst (onset potential: 0.0 mV, Tafel slope: 31 mV dec -1 , and exchange currrent density: 0.78 mA cm -2 ). The high hydrogen evolution reaction (HER) activity of such materials is likely due to the abundance of active catalytic sites, the increased electrochemically accessible surface area and significantly improved electrochemical conductivity.

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Electrocatalytic behaviors of silver–palladium nanoalloys modified carbon ionic liquid electrode towards hydrogen evolution reaction

Cited by 73 publications

References 68 publications

Vine Shoots and Grape Stalks as Carbon Sources for Hydrogen Evolution Reaction Electrocatalyst Supports

Vine Shoots and Grape Stalks as Carbon Sources for Hydrogen Evolution Reaction Electrocatalyst Supports

Surface Segregation and Chemical Ordering Patterns of Ag–Pd Nanoalloys: Energetic Factors, Nanoscale Effects, and Catalytic Implication

Reduced graphene oxide nanosheets decorated with Au, Pd and Au–Pd bimetallic nanoparticles as highly efficient catalysts for electrochemical hydrogen generation

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