A new electrochemical cell adapted to quartz crystal microbalance measurements

Ratieuville, Yann; Viers, Philippe; Jean, Alexandre; Durand, Gérard

doi:10.1016/s1388-2481(00)00133-8

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…The experimentally determined Sauerbrey constant for the 9 MHz Pt resonator was 168.2 Hz cm 2 μg −1 . The theoretical Sauerbrey constant for the 9 MHz Pt resonator in vacuum was reported between 179.2 and 183.36 Hz cm 2 μg −1 . The approximately 6−8% difference between the experimental and theoretical values is acceptable, and it can be caused by a number of factors such as the method used for experimental determination of C f , the scan rate applied for the stripping voltammetry, surface roughness, and thickness of the deposited film.…”

Section: Experimental Methodsmentioning

confidence: 97%

“…The theoretical Sauerbrey constant for the 9 MHz Pt resonator in vacuum was reported between 179.2 25 and 183.36 Hz cm 2 μg -1 . 26 The approximately 6-8% difference between the experimental and theoretical values is acceptable, and it can be caused by a number of factors such as the method used for experimental determination of C f , the scan rate applied for the stripping voltammetry, surface roughness, and thickness of the deposited film. It was found that the experimental Sauerbrey constant decreases with decreasing film thickness, from 238.1 (for films thicker than 7 monolayers) to 166.7 Hz cm 2 μg -1 (for monolayer).…”

Section: Electrochemical Quartz Crystal Microbalance (Eqcm)mentioning

confidence: 99%

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Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption

et al. 2011

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A systematic investigation of BH 4 electrooxidation in 2 M NaOH on Pt was carried out using the electrochemical quartz crystal microbalance technique (EQCM). Four sets of experiments were conducted: (i) Pt in NaOH, (ii) BH 4-(between 10 and 60 mM) on Pt, (iii) thiourea (TU) on Pt, and (iv) BH 4in the presence of TU (between 0.01 and 2.1 mM) on Pt. The BH 4 electro-oxidation mechanism was developed by correlating the EQCM results with density functional theory (DFT) calculations from the literature revealing the energetically most favorable adsorbates. The surface coverage by key intermediates was estimated using the van der Waals molecular areas. On the anodic scan, the BH 4 electrosorption was followed by dissociation of BH 4,ad generating BH y,ad and (4y)H ad , with y between 1 and 3, depending on the available surface sites. BH y,ad is further oxidized as a function of electrode potential in Eley-Rideal and Langmuir-Hinshelwood type mechanisms with the participation of OHand OH ad , respectively. The oxidative desorption on the cathodic scan at potentials between 0.1 and 0.5 V of strongly adsorbed intermediates such as BOH ad and BH 2 OH ad is essential for recovering the Pt electrocatalytic activity. TU adsorption on Pt produces a characteristic potential dependent adsorption-desorption hysteresis. Furthermore, at TU concentrations above 0.045 mM for 30 mM BH 4 a bilayer is formed on the surface, which is stabilized by Lewis acid-base interactions between TU and BH 4 -. As a result, the BH 4 oxidation overpotential is increased leading to incomplete oxidation, whereas the BH 4 thermocatalytic hydrolysis is inhibited.

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Section: Experimental Methodsmentioning

confidence: 97%

Section: Electrochemical Quartz Crystal Microbalance (Eqcm)mentioning

confidence: 99%

Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption

et al. 2011

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“…21 Furthermore, as in the case of copper, the proven formation of surface alloys with Au and Pt 29,30 and the abundant formation of hydrogen does not allow the re-use of these resonators for further experiments. On the other hand, more recently, Ratieuville et al 31 determined C f values by chronoamperometry using a solution of AgNO 3 with Pt and Au resonators. They found that the electrodeposition of silver on a gold electrode seems to be more accurate than that obtained on platinum because it has better electrochemical activation on gold than on platinum.…”

Section: Introductionmentioning

confidence: 99%

Effect of the thickness of thallium deposits on the values of EQCM sensitivity constant

Donjuan-Medrano

Montes‐Rojas

2008

New J. Chem.

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“…This technique allows for conventional electrochemical techniques, such as cyclic voltammetry (CV), chronoamperometry (CA), and other potential sweep methods to be used in parallel with the detection of nanogram mass changes [3][4][5]. This leads Student poster presentation at the ECAT2016 Symposium Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12678-017-0430-6) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

et al. 2017

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This work investigates the viability and outlines the current challenges in electrochemical quartz crystal nanobalance (EQCN) experiments on supported Pt catalysts. EQCN experiments involving Pt supported on 2-D "surface-treated graphite sputtered onto quartz crystal" (Pt/MFG-H) catalysts were compared to standard polycrystalline Pt (Pt poly ), which showed similarities in frequency versus potential trends; however, the Pt/MFG-H catalysts obtained higher frequencies due to the support capacitance. The physical characterizations (XRD and XPS) and electrochemical responses, mainly cyclic voltammetry in acidic media and the ferri/ferrocyanide couple, of the 2-D Pt/MFG-H were compared to the representative 2-D Pt supported on treated highly orientated pyrolytic graphite (Pt/HOPG-H), in order to make assertions on the similarities between the two catalysts. The XRD diffraction patterns and the XPS valence band structure for the treated and untreated MFG (-H and -P, respectively) and HOPG (-H and -P, respectively) demonstrated similarities. Nevertheless, the cyclic voltammograms and peak positions of the ferri/ferrocyanide couple between the treated and untreated MFG and HOPG catalysts were dissimilar. However, EQCN may be used qualitatively between the two different 2-D catalysts since the same trends in electrochemical responses before and after treatment of the MFG and HOPG catalysts were seen. Hence, the EQCN technique can be used in future studies as an alternative method to study degradation mechanisms of Pt and carbon for PEFCs.

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A new electrochemical cell adapted to quartz crystal microbalance measurements

Cited by 10 publications

References 23 publications

Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption

Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption

Effect of the thickness of thallium deposits on the values of EQCM sensitivity constant

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

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