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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2018

Tracking the interfacial charge transfer behavior of hydrothermally synthesized ZnO nanostructures via complementary electrogravimetric methods

Résumé

The mechanism of species fluxes during the charge–discharge process in a nanostructured ZnO electrode was studied by a combined methodology of electrochemical quartz-crystal microbalance (EQCM) and ac-electrogravimetry. Under the conditions of this study, anions (SO42−) possess the highest kinetics to be transferred at the electrode/electrolyte interface in the charge balance while cations (identified as Na+·5H2O and Na+) play the major role as charge carriers. Free H2O molecules present a sluggish behavior and their interfacial transfer occurs at a low scan rate or low frequencies. These findings shed light on the nature of ions and solvent participation in the charge balance of hydrothermally synthesized ZnO nanostructures directly grown on a QCM device. The combined methodology proposed herein provides dynamic and gravimetric analysis of interfacial charge transfer and can be extended to investigate other nanostructured metal oxide-based electrodes for energy storage.
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Dates et versions

hal-01929431 , version 1 (14-12-2018)

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Wanli Gao, Hubert Perrot, Ozlem Sel. Tracking the interfacial charge transfer behavior of hydrothermally synthesized ZnO nanostructures via complementary electrogravimetric methods. Physical Chemistry Chemical Physics, 2018, 20 (42), pp.27140 - 27148. ⟨10.1039/c8cp03593h⟩. ⟨hal-01929431⟩
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