A catalytic study of formic acid oxidation on preferentially oriented platinum electrodes

Palaikis, L.; Wiȩckowski, Andrzej

doi:10.1007/bf00763724

Cited by 14 publications

(11 citation statements)

References 29 publications

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“…Figure 4 shows representative cyclic voltammograms of the 100 and 200 nm Pt nanotubular catalysts and Pt black catalyst ink for the electrooxidation formic acid, collected using an 0.25 M HCOOH in an 0.5 M H 2 SO 4 supporting electrolyte. These are in qualitative agreement with the expected form for the electrooxidation of formic acid on a Pt catalyst [33,37,40,41]. The hydrogen adsorption/desorption peaks between 0.05 and 0.4 V versus SHE are suppressed compared to those observed in Figure 3 due to the adsorption of CO [20,33,35,40].…”

Section: International Journal Of Electrochemistrysupporting

confidence: 85%

Formic Acid Electrooxidation by a Platinum Nanotubule Array Electrode

Broaddus

Wedell

Gold

2013

International Journal of Electrochemistry

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One-dimensional metallic nanostructures such as nanowires, rods, and tubes have drawn much attention for electrocatalytic applications due to potential advantages that include fewer diffusion impeding interfaces with polymeric binders, more facile pathways for electron transfer, and more effective exposure of active surface sites. 1D nanostructured electrodes have been fabricated using a variety of methods, typically showing improved current response which has been attributed to improved CO tolerance, enhanced surface activity, and/or improved transport characteristics. A template wetting approach was used to fabricate an array of platinum nanotubules which were examined electrochemically with regard to the electrooxidation of formic acid. Arrays of 100 and 200 nm nanotubules were compared to a traditional platinum black catalyst, all of which were found to have similar surface areas. Peak formic acid oxidation current was observed to be highest for the 100 nm nanotubule array, followed by the 200 nm array and the Pt black; however, CO tolerance of all electrodes was similar, as were the onset potentials of the oxidation and reduction peaks. The higher current response was attributed to enhanced mass transfer in the nanotubule electrodes, likely due to a combination of both the more open nanostructure as well as the lack of a polymeric binder in the catalyst layer.

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Section: International Journal Of Electrochemistrysupporting

confidence: 85%

Formic Acid Electrooxidation by a Platinum Nanotubule Array Electrode

Broaddus

Wedell

Gold

2013

International Journal of Electrochemistry

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“…Preferentially orientated Pt(111) electrodes have been demonstrated to have a higher turnover frequency for HCOOH oxidation over extended periods of use due to their higher CO-poisoning tolerance than Pt(100) and polycrystalline Pt. [41] Both Pt(111) single-crystal electrodes [42] and Pt(111) preferentially oriented Pt nanoparticles [43] also have a higher long-term activity than Pt(100) and Pt(110) facets and 1286 www.chemphyschem.org supported Pt catalysts. Similar observations have been made with respect to CO poisoning by MeOH, [44] and the CO formation rate from HCOOH has been quantified on a large number of Pt facets, with relative rates observed to vary by up to an order of magnitude.…”

Section: Discussionmentioning

confidence: 99%

Towards Mixed Fuels: The Electrochemistry of Hydrazine in the Presence of Methanol and Formic Acid

Aldous

Compton

2011

ChemPhysChem

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The electrochemistry of formic acid, carbon monoxide and methanol have been investigated and evaluated in combination with hydrazine. Hydrazine was observed to display the anticipated steady-state oxidation waves at platinum (Pt) microelectrodes by cyclic voltammetry, and upon introduction of carbon monoxide (CO) gas, the Pt surface was fully passivated (prior to CO oxidation). However, the two individual responses of hydrazine and formic acid (HCOOH) are to be additive when combined in solution. No detrimental effects were observed upon the hydrazine voltammetry, even in the presence of excess formic acid, despite formic acid clearly displaying characteristic self-poisoning tendencies (primarily due to the formation of CO) in its own voltammetry. Effects intermediate to those of CO and formic acid were observed when methanol was present. Currents were essentially additive at low methanol content, but hydrazine oxidation current decreased by about 40% when an 100-fold excess of methanol was present, corresponding to poisoning by methanol dehydrogenation intermediates. These results are discussed with relevance to mixed fuels for more flexible or powerful fuel cells, and the possible formation of a random microelectrode array (templated by strongly adsorbed poison) on the microelectrode surface.

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“…It is believed that the first step for HCOOH oxidation involves the adsorption of HCOOH onto the metal surface forming the carboxyl group (COOH) as the main intermediate [16,17]. Then, COOH goes further in two parallel paths: one, called as the indirect path, forms the poisonous strongbounded CO-like species; another, called as the direct path, forms the final product of CO 2 [7,18]. Besides this dualpath, a third path, which is known as the ''formate path'', is also proposed [14,19].…”

Section: Introductionmentioning

confidence: 99%

A DFT Study on the Adsorption of Formic Acid and Its Oxidized Intermediates on (100) Facets of Pt, Au, Monolayer and Decorated Pt@Au Surfaces

Wang

Lim

2011

Catal Lett

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In this work we have systematically characterized the adsorption of formic acid, its decomposed intermediates and products on the (100) surfaces of Pt, Au, monolayer and decorated Pt@Au surfaces. The calculated thermodynamic results validate our previous experimental results that the decorated Pt@Au surface may facilitate formic acid oxidation compared with the benchmark Pt catalyst; while the monolayer Pt@Au surface is not suitable for formic acid oxidation.

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A catalytic study of formic acid oxidation on preferentially oriented platinum electrodes

Cited by 14 publications

References 29 publications

Formic Acid Electrooxidation by a Platinum Nanotubule Array Electrode

Formic Acid Electrooxidation by a Platinum Nanotubule Array Electrode

Towards Mixed Fuels: The Electrochemistry of Hydrazine in the Presence of Methanol and Formic Acid

A DFT Study on the Adsorption of Formic Acid and Its Oxidized Intermediates on (100) Facets of Pt, Au, Monolayer and Decorated Pt@Au Surfaces

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