A Volcano Curve: Optimizing Activity of Shell-Core Pt<sub>x</sub>Ru<sub>y</sub>@PdCu/C Catalysts for Methanol Oxidation by Tuning Pt/Ru Ratio

Mao, Xuefeng; Yang, Juan; Key, Julian; Ji, Shan; Wang, Hui; Wang, Rongfang

doi:10.1149/2.060304jes

Cited by 22 publications

(14 citation statements)

References 34 publications

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“…Later, they studied the effects of the Pt:Ru ratio on the methanol oxidation activity for the same catalyst. 354 A volcano curve was obtained, which gave a Pt:Ru ratio of 2:1 for the maximum methanol oxidation activity.…”

Section: Quaternary Core−shell Nanoparticlesmentioning

confidence: 99%

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

et al. 2014

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Section: Quaternary Core−shell Nanoparticlesmentioning

confidence: 99%

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

et al. 2014

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“…[5][6][7][8] Thanks to the tunable ratio of active metals, bimetallic catalyst performance can be optimized. [9][10][11] Bimetallic catalysts are extensively studied since they can mimic the catalytic behavior of a monometallic catalyst offering the benefit of an improved stability. 12 An example for this are PdZn catalysts as an alternative for Cu in ethanol dehydrogenation to acetaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Waele

Galvita

Poelman

et al. 2017

Catal. Sci. Technol.

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A hydrotalcite-based PdZn nanoparticle catalyst, PdZn/MgĲAl)ĲPd)ĲZn)O x has been synthesized via a onepot procedure. The activation comprising H 2 and air treatmentĲs) allows tuning the nanoparticle formation and, hence, the catalyst performance. Based on an elaborate set of characterization data from EXAFS, in situ XRD, STEM and CO chemisorption, it is concluded that single reduction leads to the formation of Pdrich alloy nanoparticles, i.e., a PdZn shell with a Pd core. Cycled reduction, i.e., 3 subsequent hydrogen and air treatments, ensures the formation of more homogeneously mixed PdZn nanoparticles. Compared with a PdZn/ZnO reference catalyst, the nanoparticles obtained after cycled reduction exhibit a higher initial average turnover frequency in ethanol dehydrogenation, i.e., 7.0 molEtOH (mol Pd s) −1 rather than 3.2 molEtOH (mol Pd s). An activity loss is observed during the first hours on stream. It is attributed to coking of the Pd sites which are also deemed responsible for acetaldehyde decomposition. Hence, the acetaldehyde selectivity steadily increases during the first hours on stream. Subsequently, the acetaldehyde space time yield and selectivity stabilize at 0.7 × 10 −4 mol s −1 kg −1Pd and 98%, respectively.

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“…Based on these issues, air and water stable bis(trifluoromethylsulfonyl)amide (TFSA − )-based ionic liquids have been considered promising media for electrodeposition of various metals and metal nanoparticles. [18][19][20][21][22][23][24][25] Electrodeposition of Pt and its alloys has been reported in some ionic liquids. [26][27][28][29][30][31][32] Abbott et al investigated electrodeposition of Pt and Pt-Al alloys in AlCl 3 /benzyltrimethylammonium chloride ionic liquid.…”

mentioning

confidence: 99%

Electrochemical Behavior of Bis(acetylacetonato)platinum(II) Complex in an Amide-Type Ionic Liquid

Sultana

Tachikawa

Yoshii

et al. 2016

J. Electrochem. Soc.

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Electrochemical behavior of bis(acetylacetonato)platinum(II) (Pt(acac) 2 ) was investigated in an amide-type ionic liquid, trimethylhexylammonium bis(trifluoromethylsulfonyl)amide (TMHATFSA), at various temperatures. Ultraviolet visible spectroscopy revealed the existence of Pt(acac) 2 having square planar geometry in TMHATFSA. The electrochemical reduction of Pt(acac) 2 to Pt(0) was considered to occur with formation of some intermediate species of Pt by cyclic voltammetry. Potentiostatic cathodic reduction on a glassy carbon electrode in TMHATFSA containing Pt(acac) 2 at −1.7 V at 130 • C resulted in deposition of metallic Pt, which was confirmed by scanning electron microscopy and energy dispersive X-ray spectroscopy. In addition, formation of Pt nanoparticles dispersed in the ionic liquid after potentiostatic cathodic reduction was confirmed by transmission electron microscopy and electron diffraction. The sizes of the Pt nanoparticles were found to depend on the reduction potential.Platinum (Pt) has been known to be one of the important catalysts for various chemical and electrochemical reactions. Pt is well known to be used as the catalyst in water electrolysis, hydrogenation of hydrocarbon, fuel cell, and so on. The electrodeposition method has been proved to be useful for preparation of materials with controlled size and morphology. To date, efforts have been focused on preparation of Pt catalysts with high surface area to achieve high catalytic activity. Numerous studies on electrochemical behavior of Pt film and/or nanoparticles in aqueous solutions are available in the literature. [1][2][3][4][5][6][7][8] However, the previous attempts on electrodeposition of Pt in aqueous solutions were often accompanied with hydrogen evolution due to the high catalytic activity of Pt. The co-deposition of hydrogen during Pt electrodeposition leads to embrittlement of Pt. This necessitates the utilization of non-aqueous electrolytes including ionic liquids.Ionic liquids have drawn intensive interest as an alternative of molecular solvents due to their excellent properties, which include acceptable ionic conductivity, negligible vapor pressure, and less inflammability. Aprotic ionic liquids having wide electrochemical potential windows are expected to be the alternative media for deposition of metals compared with conventional organic electrolytes. 9,10 In addition, preparation of nanoparticles in ionic liquids has received increasing attention in recent years. 11-17 Among the ionic liquids, the chloroaluminate or chlorozincate ionic liquids have received special attention for metal electrodeposition. However, the application of these chlorometallate ionic liquids was limited due to their water sensitivity and co-deposition of Al or Zn during reduction of desired metals. Based on these issues, air and water stable bis(trifluoromethylsulfonyl)amide (TFSA − )-based ionic liquids have been considered promising media for electrodeposition of various metals and metal nanoparticles. 18-25 Electrodeposition of Pt and its allo...

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A Volcano Curve: Optimizing Activity of Shell-Core Pt_xRu_y@PdCu/C Catalysts for Methanol Oxidation by Tuning Pt/Ru Ratio

Cited by 22 publications

References 34 publications

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Electrochemical Behavior of Bis(acetylacetonato)platinum(II) Complex in an Amide-Type Ionic Liquid

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A Volcano Curve: Optimizing Activity of Shell-Core PtxRuy@PdCu/C Catalysts for Methanol Oxidation by Tuning Pt/Ru Ratio

Cited by 22 publications

References 34 publications

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

Anode Catalysts for Direct Methanol Fuel Cells in Acidic Media: Do We Have Any Alternative for Pt or Pt–Ru?

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Electrochemical Behavior of Bis(acetylacetonato)platinum(II) Complex in an Amide-Type Ionic Liquid

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A Volcano Curve: Optimizing Activity of Shell-Core Pt_xRu_y@PdCu/C Catalysts for Methanol Oxidation by Tuning Pt/Ru Ratio