ChemInform Abstract: Electrocatalysis by Ad‐Atoms. Part 23. Design of Platinum Ad‐Electrodes for Formic Acid Fuel Cells with Ad‐Atoms of the IVth and the Vth Groups.

Watanabe, Masahiro; Horiuchi, M.; Motoo, Satoshi

doi:10.1002/chin.198843022

Cited by 9 publications

(12 citation statements)

References 1 publication

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“…Other Pt-based alloys have been tested in formic acid/formate electrooxidation such as PtFe [ 79 ], PtAu [ 67 , 90 ], PtAg [ 65 ], PtCo [ 66 ], PtCu [ 68 ], PdPt [ 39 , 71 , 73 , 91 , 92 ], PtBi [ 69 , 93 ] or PtSn [ 68 , 93 , 94 ] ( Table 2 ). Indeed, the use of Bi, Sb, As, Pb, Sn and Ge as dopants for Pt has been investigated from several decades ago, finding optimum loadings of around 50% in most cases [ 93 , 94 ]. Adzic et al even added these dopants in situ, by electrodeposition on Pt electrodes, leading to enhanced electrooxidation of formic acid.…”

Section: Platinum For Formic Acid/formate Electrooxidationmentioning

confidence: 99%

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

et al. 2021

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Energy production and consumption without the use of fossil fuels are amongst the biggest challenges currently facing humankind and the scientific community. Huge efforts have been invested in creating technologies that enable closed carbon or carbon neutral fuel cycles, limiting CO2 emissions into the atmosphere. Formic acid/formate (FA) has attracted intense interest as a liquid fuel over the last half century, giving rise to a plethora of studies on catalysts for its efficient electrocatalytic oxidation for usage in fuel cells. However, new catalysts and catalytic systems are often difficult to compare because of the variability in conditions and catalyst parameters examined. In this review, we discuss the extensive literature on FA electrooxidation using platinum, palladium and non-platinum group metal-based catalysts, the conditions typically employed in formate electrooxidation and the main electrochemical parameters for the comparison of anodic electrocatalysts to be applied in a FA fuel cell. We focused on the electrocatalytic performance in terms of onset potential and peak current density obtained during cyclic voltammetry measurements and on catalyst stability. Moreover, we handpicked a list of the most relevant examples that can be used for benchmarking and referencing future developments in the field.

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Section: Platinum For Formic Acid/formate Electrooxidationmentioning

confidence: 99%

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

et al. 2021

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“…Different from Sb UPD on Pt surfaces [20,25], coverage of Sb (θSb, a coefficient based on the ratio of Pd sites filled and not filled) on Pd surface was tuned by controlling the UPD time. In this paper, Sb UPD on fresh Pd films was performed for 10 s, 20 s, 30 s, respectively.…”

Section: Sb Upd On Pd Film Electrodesmentioning

confidence: 99%

“…The electronic effect leads to a weakening of the CO-Pd interaction [27] and makes the direct pathway of formic acid oxidation being predominant [23]. In bi-functional mechanism, Sb adatoms provide active sites for -OH formation at lower potentials than on pure Pd, and -OH promotes the oxidative removal of adsorbed poisoning intermediates during formic acid oxidation [18,20,28].…”

Section: Sb Mupd On Pd Film Electrodesmentioning

confidence: 99%

“…They showed that electrochemical surface modification of Pd by Sb adatoms enhances the oxidation of formic acid by more than two-fold in an electrochemical cell. For Sb modification, previous approaches, such as irreversible adsorption (IRA) and traditional UPD method required external potential controlled desorption of partial Sb, which were not suitable for scaled synthesis or upgrading of practical powder catalysts [20][21][22]. Among the known Sb surface modification method, mimetic underpotential deposition (MUPD) technique was a newly proposed electroless approach to achieve sufficient surface modification [23].…”

Section: Introductionmentioning

confidence: 99%

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Sb Surface Modification of Pd by Mimetic Underpotential Deposition for Formic Acid Oxidation

et al. 2015

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Abstract:The newly proposed mimetic underpotential deposition (MUPD) technique was extended to modify Pd surfaces with Sb through immersing a Pd film electrode or dispersing Pd/C powder in a Sb(III)-containing solution blended with ascorbic acid (AA). The introduction of AA shifts down the open circuit potential of Pd substrate available to achieve suitable Sb modification. The electrocatalytic activity and long-term stability towards HCOOH electrooxidation of the Sb modified Pd surfaces (film electrode or powder catalyst) by MUPD is superior than that of unmodified Pd and Sb modified Pd surfaces by conventional UPD method. The enhancement of electrocatalytic performance is due to the third body effect and electronic effect, as well as bi-functional mechanism induced by Sb modification which result in increased resistance against CO poisoning.

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“…Incidentally, it was observed that the adsorption of some foreign adatoms enhanced the electrochemical reaction rate. The most relevant papers, in which fundamental interpretation of data is attempted, can be found in the works by S. Motoo, who classified the effect of surface adatoms on polycrystalline platinum into three groups: i) those inducing electronic effects to the surface of the material, ii) those acting as a third body, simply inhibiting the dehydration reaction and iii) those playing a bifunctional role, in such a way that they would easily adsorb oxygen suitable to oxidize adsorbed CO at lower potentials than on pure platinum [6,7].…”

Section: A N U S C R I P T Introductionmentioning

confidence: 99%

Heterogeneous electrocatalysis of formic acid oxidation on platinum single crystal electrodes

Boronat-González

Herrero

Feliu

2017

Current Opinion in Electrochemistry

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Highlights Electrocatalysis of formic acid oxidation on platinum single crystal electrodes modified by adatoms is reviewed  The different behavior of the adatoms is described  Models describing the observed effect of the adatoms are presented.  A mechanism for the electrocatalysis is presented combining experiments and theoretical results. AbstractThe oxidation of formic acid on single crystal platinum electrodes modified by a constant coverage of irreversibly adsorbed adatoms is described in this review. This subject has been studied for a wide period and the available information is huge. In consequence, we have selected the self-consistent set of results, which try to explain the nature of the electrocatalytic behaviour of the adatoms and to point out the research details that should be addressed in the future. All the results have been linked to the increasing understanding of formic acid oxidation on single crystal platinum electrodes in absence of foreign adatoms.

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ChemInform Abstract: Electrocatalysis by Ad‐Atoms. Part 23. Design of Platinum Ad‐Electrodes for Formic Acid Fuel Cells with Ad‐Atoms of the IVth and the Vth Groups.

Cited by 9 publications

References 1 publication

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

Sb Surface Modification of Pd by Mimetic Underpotential Deposition for Formic Acid Oxidation

Heterogeneous electrocatalysis of formic acid oxidation on platinum single crystal electrodes

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