Dynamics of electrochemical Pt dissolution at atomic and molecular levels

Lopes, Pietro Papa; Tripković, Dušan; Martins, Pedro F. B. D.; Strmčnik, Dušan; Ticianelli, Édson Antônio; Stamenković, Vojislav R.; Marković, Nenad M.

doi:10.1016/j.jelechem.2017.09.047

Cited by 89 publications

(104 citation statements)

References 53 publications

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“…Dissolution maximums are again increasing with decreasing the LPL value, which is in line with the more complete oxide reduction as a result of the sluggish kinetics of Pt oxide reduction. 31 On the other hand, the total amounts of Pt dissolved found in the downstream electrolyte (Fig. 3d) are decreasing with decreasing LPL indicating that redeposition is more effective for the same three reasons as mentioned previously.…”

Section: Resultssupporting

confidence: 64%

“…Hence this process is not significantly dependent on the scan rate, but only on the amount of oxide formed. 1,31 In the cathodic branch (not shown), the trend as regards the totally dissolved amount of Pt (note that this is different from the dissolution rates) is the same as in the anodic counterpart. This is in line with the amount of oxide formed, which is increasing with decreasing the scan rate.…”

Section: Resultsmentioning

confidence: 93%

“…1, 31 The interplay of the effects of oxide reduction and redeposition is demonstrated by the trend of concentration maximums in the cathodic scan.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Platinum Dissolution and Redeposition from Pt/C Fuel Cell Electrocatalyst at Potential Cycling

Pavlišič

Jovanovič

Šelih

et al. 2018

J. Electrochem. Soc.

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Extremely sensitive on-line detection of metal ions concentration was used to investigate potential-resolved platinum dissolution from commercial fuel cell electrocatalyst. The experiments were carried out in an electrochemical flow cell connected to inductively coupled plasma mass spectrometer. A variety of electrochemical treatments using different voltage scan rates confirmed the previously observed primary platinum degradation mechanism -the so-called "transient dissolution". Importantly, the redeposition of dissolved platinum is now shown to play an important role in the overall effective Pt dissolution. Pt redeposition trends exhibit a significant dependence on voltage scan rate.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 93%

See 1 more Smart Citation

Platinum Dissolution and Redeposition from Pt/C Fuel Cell Electrocatalyst at Potential Cycling

Pavlišič

Jovanovič

Šelih

et al. 2018

J. Electrochem. Soc.

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“…Most notable in Pt single crystal transient dissolution has been the recent works of Lopes et al . Using the technique referred to as a stationary probe rotating disk electrode coupled to an inductively coupled plasma mass spectrometer (SPRDE‐ICP‐MS), key aspects of dissolution on the platinum single crystal basal planes were observed.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of Platinum Single Crystals in Acidic Medium

et al. 2019

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Platinum single crystal basal planes consisting of Pt(111), Pt(100), Pt(110) and reference polycrystalline platinum Pt(poly) were subjected to various potentiodynamic and potentiostatic electrochemical treatments in 0.1 M HClO4. Using the scanning flow cell coupled to an inductively coupled plasma mass spectrometer (SFC‐ICP‐MS) the transient dissolution was detected on‐line. Clear trends in dissolution onset potentials and quantities emerged which can be related to the differences in the crystal plane surface structure energies and coordination. Pt(111) is observed to have a higher dissolution onset potential while the generalized trend in dissolution rates and quantities was found to be Pt(110)>P(100)≈Pt(poly)>Pt(111).

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“…The electrosorption of anions, in particular oxoanions and halides on noble metal electrode surfaces, is a major topic in the field of interfacial electrochemistry and electrocatalysis. The presence of adsorbed species and their adsorption strength can strongly affect reaction kinetics, activity and selectivity . Electrocatalytic reactions are often influenced by nonreactive specifically adsorbed anions (spectator species), that lead to changes in structure and composition of the electrical double‐layer and alter the electronic properties of a catalyst's surface or even block active surface sites .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Acetate on Au(111): An in‐situ Scanning Tunnelling Microscopy Study and Implications on Formic Acid Electrooxidation

et al. 2019

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The adsorption of acetate on an Au(111) electrode surface in contact with acetic acid at pH 2.7 was imaged in‐situ using scanning tunnelling microscopy (STM). Two different ordered structures were imaged for acetate adsorbed in the bidentate configuration on the unreconstructed ()1×1 surface at 0.95 V (vs. the saturated calomel electrode, SCE). The first structure,(19×19)R23.45∘ , is metastable and transforms at constant potential within 20 minutes to a (2×2) structure, which is thermodynamically more favourable. The (2×2) acetate adlayer starts to form at step edges and propagates via nucleation and growth onto terraces. The findings from in‐situ STM are in agreement with the electrochemical behaviour of acetate on Au(111) characterized by voltammetry. A comparison is made with formate adsorption on Au(111). While acetate is not reactive, in contrast to formate, it can act as a spectator species in formic acid electrooxidation.

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Dynamics of electrochemical Pt dissolution at atomic and molecular levels

Cited by 89 publications

References 53 publications

Platinum Dissolution and Redeposition from Pt/C Fuel Cell Electrocatalyst at Potential Cycling

Platinum Dissolution and Redeposition from Pt/C Fuel Cell Electrocatalyst at Potential Cycling

Dissolution of Platinum Single Crystals in Acidic Medium

Adsorption of Acetate on Au(111): An in‐situ Scanning Tunnelling Microscopy Study and Implications on Formic Acid Electrooxidation

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