Mixed platinum–gold electrocatalysts for borohydride oxidation prepared by the galvanic replacement of nickel deposits

Tegou, A.; Armyanov, S.; Valova, E.; Steenhaut, Oscar; Hubin, Annick; Kokkinidis, G.; Sotiropoulos, S.

doi:10.1016/j.jelechem.2009.07.016

Cited by 73 publications

(33 citation statements)

References 56 publications

(83 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Au electroactive surface areas calculated by the charge associated with the Au surface oxide stripping peak (420 mC cm À2 ) [49] are 0.0207 cm 2 , 0.00218 cm 2 , 0.00890 cm 2 , 0.01506 cm 2 , 0.00248 cm 2 and 0.02333 cm 2 for Au/C, AueFe/C, AueCo/C, AueNi/C, AueCu/C and AueZn/C, respectively. Therefore, the AueZn/C reveals the biggest electroactive surface area, indicating the best borohydride oxidation activity.…”

Section: 2mentioning

confidence: 99%

Comparison of electrocatalytic activity of carbon-supported Au–M (M = Fe, Co, Ni, Cu and Zn) bimetallic nanoparticles for direct borohydride fuel cells

Wang

Liu

et al. 2012

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Section: 2mentioning

confidence: 99%

Comparison of electrocatalytic activity of carbon-supported Au–M (M = Fe, Co, Ni, Cu and Zn) bimetallic nanoparticles for direct borohydride fuel cells

Wang

Liu

et al. 2012

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…Pt has considerable electrocatalytic activity for borohydride oxidation (BOR), but it also causes chemical decomposition of NaBH 4 at open circuit while its very low hydrogen evolution overpotential does not allow operation close to the borohydride standard potential (which is lower than that of H 2 ); it also shows a low coulombic efficiency since the reaction is completed with the loss of four electrons per molecule. On the other hand, Au is an inferior electrocatalyst but its coulombic efficiency approaches the maximum value, corresponding to the eight-electron reaction pathway [104,106]. Bimetallic Pt-Au systems are expected to combine the high kinetics of Pt with the high coulombic efficiency of Au [302][303][304].…”

Section: Borohydride Oxidationmentioning

confidence: 99%

“…Vanrenterghem et al [310] have proven that Ag modified Ni layers and Ni foams show both higher intrinsic catalytic activity towards benzyl-bromide reduction and higher yields of toluene production during its bulk electrolysis. The same authors have managed to prepare a tri-metallic PtAu(Ni) electrode of a mixed Pt-Au surface [104], exhibiting the corresponding combination of good catalytic activity and coulombic efficiency (see Figure 9B). XRD measurements confirmed complete PtAu alloying, while surface and BOR electrochemistry proved the desired co-existence of Pt and Au on the surface (i.e., the absence of segregation); note that the preparation of PtAu surface alloys is a very difficult task since the two metals are not expected to form a single phase at non-elevated temperatures [308] and, on the other hand, Au will segregate on the surface at elevated temperatures [309].…”

Section: Other Cathodic Reactionsmentioning

confidence: 99%

Electrocatalysts Prepared by Galvanic Replacement

et al. 2017

View full text Add to dashboard Cite

Galvanic replacement is the spontaneous replacement of surface layers of a metal, M, by a more noble metal, M noble , when the former is treated with a solution containing the latter in ionic form, according to the general replacement reaction: nM + mM noble n+ → nM m+ + mM noble. The reaction is driven by the difference in the equilibrium potential of the two metal/metal ion redox couples and, to avoid parasitic cathodic processes such as oxygen reduction and (in some cases) hydrogen evolution too, both oxygen levels and the pH must be optimized. The resulting bimetallic material can in principle have a M noble-rich shell and M-rich core (denoted as M noble (M)) leading to a possible decrease in noble metal loading and the modification of its properties by the underlying metal M. This paper reviews a number of bimetallic or ternary electrocatalytic materials prepared by galvanic replacement for fuel cell, electrolysis and electrosynthesis reactions. These include oxygen reduction, methanol, formic acid and ethanol oxidation, hydrogen evolution and oxidation, oxygen evolution, borohydride oxidation, and halide reduction. Methods for depositing the precursor metal M on the support material (electrodeposition, electroless deposition, photodeposition) as well as the various options for the support are also reviewed. 1. Principle of Galvanic Replacement/Deposition 1.1. Thermodynamic Considerations When a metal, M (e.g., Cu, Fe, Co, Ni, Al, etc.), is immersed in a solution containing ions of a more noble metal, M noble n+ (e.g., Pt, Au, Pd, Ag, Ru, Ir, Rh, Os, etc.-i.e., a metal with a higher standard potential) then, due to the difference in their standard electrochemical potentials, E 0 noble − E 0 > 0, and provided that the ionic form of M is stable under the given experimental conditions (of temperatue, pH, complexing agents etc.), the following reaction is thermodynamically favored and can take place spontaneously: M noble n+ + n/m M → M noble + n/m M m+ (1) This reaction, which bears similarities with transmetalation reactions between metal complexes [1] and is also known as immersion plating [2] in the plating industry and galvanic replacement [3] in materials chemistry, can be considered to originate from the coupling of the following two half-reactions: M noble n+ + ne − ↔ M noble (E 0 noble) (2) M m+ + me − ↔ M (E 0) (3)

show abstract

“…Among several strategies to synthesize Ni oxide, electrochemical deposition technique is a simple method with several advantages [25,26]. In this work, we describe an approach to deposit Ni oxide nanoparticles on TiO 2 nanotubes by an optimized electrochemical technique and then explore the photocatalysis of Ni oxide loaded TiO 2 nanotubes under UV and visible light conditions.…”

Section: +mentioning

confidence: 99%

Electrodeposition of Ni oxide on TiO2 nanotube arrays for enhancing visible light photoelectrochemical water splitting

Zhang

et al. 2013

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Mixed platinum–gold electrocatalysts for borohydride oxidation prepared by the galvanic replacement of nickel deposits

Cited by 73 publications

References 56 publications

Comparison of electrocatalytic activity of carbon-supported Au–M (M = Fe, Co, Ni, Cu and Zn) bimetallic nanoparticles for direct borohydride fuel cells

Comparison of electrocatalytic activity of carbon-supported Au–M (M = Fe, Co, Ni, Cu and Zn) bimetallic nanoparticles for direct borohydride fuel cells

Electrocatalysts Prepared by Galvanic Replacement

Electrodeposition of Ni oxide on TiO2 nanotube arrays for enhancing visible light photoelectrochemical water splitting

Contact Info

Product

Resources

About