Dependence of the reliability of electrochemical quartz-crystal nanobalance mass responses on the calibration constant, Cf : analysis of three procedures for its determination

Vatankhah, Gholamreza; Lessard, Jean; Jerkiewicz, Gregory; Zolfaghari, Alireza; Conway, B. E.

doi:10.1016/s0013-4686(03)00083-5

Cited by 77 publications

(47 citation statements)

References 27 publications

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“…As a relation between the mass change, Dm, and the change in the resonance frequency, Df, of the quartz crystal is calculated by the Sauerbrey equation [30]:…”

Section: Electrochemical Measurements In Combination With Quartz Crysmentioning

confidence: 99%

Determination of the Potentiostatic Stability of PEMFC Electro Catalysts at Elevated Temperatures

2009

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The electrochemical stability of platinum on carbon catalyst (Hispec™ 4000, Johnson Matthey) has been investigated predominantly at constant potentials ranging from 0.95 to 1.25 V at elevated temperatures. By combining a quartz crystal microbalance (QCM) with electrochemical techniques, dynamic insight is obtained on the oxidation and corrosion of both platinum and carbon during potentiostatic hold. From the cyclic voltammetry (CV) data, it can be concluded that at all conditions, the platinum surface area decreases when Pt on carbon catalysts are exposed to a constant potential of 1.05 to 1.25 V. Under the applied conditions, this loss of surface area is primarily caused by the dissolution of platinum.Both the QCM as well as on‐line electrochemical mass spectrometry (OLEMS) experiments show that the corrosion of carbon is catalysed by the presence of platinum at 80 °C, as long as the platinum surface is not passivated by an oxide layer.

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“…As a relation between the mass change, Dm, and the change in the resonance frequency, Df, of the quartz crystal is calculated by the Sauerbrey equation [30]:…”

Section: Electrochemical Measurements In Combination With Quartz Crysmentioning

confidence: 99%

Determination of the Potentiostatic Stability of PEMFC Electro Catalysts at Elevated Temperatures

2009

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“…The mechanism of the electrochemical oxidation of absorbed CO on rough Pt surfaces has been widely discussed [24][25][26][27][28][29][30][31][32]. Of late, Jerkiewicz and coworkers [33][34][35][36][37] reported that PtO species, rather than PtOH would be involved in the Langmuir-Hinshelwood mechanism and includes the step of water discharging (reaction 2) followed by the CO ads oxidation via the interaction with adsorbed O (reaction 3)…”

Section: Resultsmentioning

confidence: 99%

Enhancement of CO Tolerance on Electrodeposited Pt Anode for Micro‐PEM Fuel Cells

Joo¹,

Lee²,

Kwon³

et al. 2010

Fuel Cells

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Electrodeposited and sprayed Pt anode catalysts were electrochemically characterised by CO stripping voltammetry as well as their activity to CO tolerance in micro‐PEMFCs was demonstrated using polarisation measurements. While the onset and peak potentials of CO oxidation on the sprayed Pt/C varied with the CO coverage, these were lower (∼50 mV) with the electrodeposited Pt anode. This difference is attributed to the varying properties of the Pt–OH on either rough or smooth surface mainly created from different sizes of Pt particles. In fuel cell performance test, the electrodeposited Pt anode showed maximum power density of 360 mW cm–2 and it was markedly (∼110 mW cm–2) higher than the sprayed Pt/C anode. The enhanced activity of the electrodeposited Pt anode is also reflected by the fact that the entire amount of adsorbed CO becomes almost desorbed during the first three polarisation scans, while with the Pt/C anode at least five cycles are required.

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“…A cylindrical teflon cell [61] and a three electrode setup including a platinum (Pt) as pseudo-reference electrode (RE) and counter electrode (CE) and copper foil on quartz as working electrode (WE) was used. Copper was deposited chrono-potentiometrically for 600 s with a current density of 1 mA cm −2 [62]. To determine the calibration factor [see equation (2)] the charge Q is plotted against the change of the resonance frequency ∆f (see Figure 16).…”

Section: Methodsmentioning

confidence: 99%

Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance

et al. 2013

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Abstract:A new approach to study the chemical stability of electrodeposited lithium on a copper metal substrate via measurements with a fast impedance scanning electrochemical quartz crystal microbalance is presented. The corrosion of electrochemically deposited lithium was compared in two different electrolytes, based on lithium difluoro(oxalato) borate (LiDFOB) and lithium hexafluorophosphate, both salts being dissolved in solvent blends of ethylene carbonate and diethyl carbonate. For a better understanding of the corrosion mechanisms, scanning electron microscopy images of electrodeposited lithium were also consulted. The results of the EQCM experiments were supported by AC impedance measurements and clearly showed two different corrosion mechanisms caused by the different salts and the formed SEIs. The observed mass decrease of the quartz sensor of the LiDFOB-based electrolyte is not smooth, but rather composed of a series of abrupt mass fluctuations in contrast to that of the lithium hexafluorophosphate-based electrolyte. After each slow decrease of mass a rather fast increase of mass is observed several times. The slow mass decrease can be attributed to a consolidation process of the SEI or to the partial dissolution of the SEI leaving finally lithium metal unprotected so that a fast film formation sets in entailing the observed fast mass increases.

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Dependence of the reliability of electrochemical quartz-crystal nanobalance mass responses on the calibration constant, Cf : analysis of three procedures for its determination

Cited by 77 publications

References 27 publications

Determination of the Potentiostatic Stability of PEMFC Electro Catalysts at Elevated Temperatures

Determination of the Potentiostatic Stability of PEMFC Electro Catalysts at Elevated Temperatures

Enhancement of CO Tolerance on Electrodeposited Pt Anode for Micro‐PEM Fuel Cells

Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance

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