Activity of a PtBi alloy in the electrochemical oxidation of formic acid

Tripković, A.V.; Popović, K.Dj.; Stevanović, R.M.; Socha, Robert P.; Kowal, Andrzej

doi:10.1016/j.elecom.2006.07.005

Cited by 121 publications

(94 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these experiments the high potential limit was set at 0.9 V. Under these conditions, two anodic peaks (1 and 2) in the direct scan, and the broad bell shaped wave (3), in the re-TOPICAL CLUSTER verse scan were obtained. This voltammetric behaviour is in good agreement with those previously reported in the literature for smooth polycrystalline platinum electrodes [16,18,19,[43][44][45][46][47], and reflects either the well-known dual paths mechanism [46,48], or, as was recently proposed, the triple path mechanism [11,48]. That is, the direct formic oxidation to CO 2 (dehydrogenation path), the route mediated by CO ads -like poison species (dehydration path), and the formate pathway, involving the formation and subsequent oxidation of adsorbed formate to CO 2 .…”

Section: Formic Acid Oxidationsupporting

confidence: 91%

“…However, platinum is susceptible to poisons such as CO, which strongly adsorbs onto the electrode surface active sites resulting in a dramatic decrease in catalytic efficiency [3,4,13]. Under given conditions, the activity of platinum towards the electrooxidation of HCOOH can be promoted by either using nanostructured platinum electrodes [13][14][15] or platinum electrodes modified by foreign metal ad-atoms [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Platinum electrodes with high surface areas and welldefined periodic nanostructures have recently received increasing interest, because of their potential applications in electrocatalysis and electroanalysis [14,16,19,20,21,[25][26][27][28][29][30][31]. These electrode systems can be prepared by templating techniques from lyotropic liquid crystalline phases of non-ionic surfactants [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bismuth‐Coated Mesoporous Platinum Microelectrodes as Sensors for Formic Acid Detection

2011

View full text Add to dashboard Cite

Mesoporous platinum microeletrodes (MPtEs) modified by sub-monolayers of irreversibly adsorbed bismuth (BiMPtE) were investigated for their potential use as sensors for the detection of formic acid in direct formic acid fuel cells. The mesoporous platinum films were prepared by electrodeposition of platinum on Pt microdisks substrates 25 mm diameter, from hexachloroplatinic acid dissolved in the aqueous domain of the lyotropic liquid crystalline phase of octaethylene glycol monohexadecyl ether. The roughness factor (RF) of the MPtEs was about two orders of magnitude greater than those of the corresponding polished microelectrodes. Bismuth ad-atoms onto the platinum surface were deposited by under potential deposition from 1 mM Bi 3 + ions in 0.5 M H 2 SO 4 solutions. The catalytic activity of a series of Bi-MPtEs, characterized by different roughness and fractional bismuth coverage (q Bi ), towards the oxidation of HCOOH, was investigated by cyclic voltammetry and potential step experiments. Compared to MPtEs, Bi-MPtEs displayed enhanced electrooxidation currents at lower potentials. The stability of irreversibly adsorbed bismuth, and consequently the Bi-MPtEs catalytic activity, was found to depend on the high potential limit employed in the measurements. In general, both electrode stability and electrocatalytic performance were good, provided that the operational potential was kept 0.4 V vs. Ag/AgCl. Bi-MPtEs with q Bi > 0.3 provided almost sigmoidal shaped waves with low hysteresis, as those expected for microelectrodes working under steady state. The effect of concentration of HCOOH was investigated over the range 0.01-5 M, and linearity between current and concentration depended on both roughness factor and bismuth coverage. A Bi-MPtE characterised by RF = 210 and q Bi ! 0.6 provided linearity up to 2 M of formic acid. Reproducibility of the sensors was within 2 % (RSD). The same sensor, under the optimized experimental conditions, could be employed for at least two months with negligible loss of the initial performance.

show abstract

Section: Formic Acid Oxidationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bismuth‐Coated Mesoporous Platinum Microelectrodes as Sensors for Formic Acid Detection

2011

View full text Add to dashboard Cite

show abstract

“…As mentioned, Tripkovic et al observed that the catalysts based in PtBi and PtPb present very good catalytic activity for formic acid oxidation, but these materials have no practical applications in DFAFCs, due to the applied methodology of synthesis (underpotential deposition of Pb in Pt). 22 Thus, the use of PbO x /C as catalyst can be a good choice in real fuel cell systems. The voltammetry profile of the Pt-PbO x /C catalyst can be compared with metallic Pd, which constitutes the state-of-the-art material to this kind of application.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

“…21 Tripkovic et al demonstrated that a PtBi catalyst starts formic acid oxidation at 0.25 V less positive potential, in comparison with polycrystalline Pt. 22 As demonstrated, the synergetic effects of lead in anodes have been widely discussed in the literature, but the use of lead oxides (PbO x ) to promote formic acid oxidation are being presented and discussed for the first time in this paper.…”

Section: Introductionmentioning

confidence: 99%

Active Pt-PbOx/C anodes to promote the formic acid oxidation in presence of sulfuric acid

Buzzo¹,

Niquirilo²,

Suffredini³

2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Este trabalho propõe estudar ânodos baseados em Pt e PbO x frente à reação de oxidação do ácido fórmico. Os materiais estudados foram sintetizados por uma metodologia sol-gel adaptada. Estudos voltamétricos mostraram que o processo de oxidação ocorre em potenciais extremamente baixos. Este bom desempenho foi comprovado por meio de curvas de polarização e cronoamperometrias.The performance of Pt-PbO x -based catalysts to promote the formic acid oxidation is described here. All materials were synthesized by a modified sol-gel method. Voltammetric studies showed that the Pt-PbO x /C anode starts the oxidation process at extremely low potentials. Quasi-stationary polarization experiments and current vs. time measurements confirmed this affirmation.

show abstract

CO Adsorption on Platinum Electrodes

Cuesta

Gutiérrez

2011

Catalysis in Electrochemistry

View full text Add to dashboard Cite

Activity of a PtBi alloy in the electrochemical oxidation of formic acid

Cited by 121 publications

References 27 publications

Bismuth‐Coated Mesoporous Platinum Microelectrodes as Sensors for Formic Acid Detection

Bismuth‐Coated Mesoporous Platinum Microelectrodes as Sensors for Formic Acid Detection

Active Pt-PbOx/C anodes to promote the formic acid oxidation in presence of sulfuric acid

CO Adsorption on Platinum Electrodes

Contact Info

Product

Resources

About