QCM-D studies of polypyrrole influence on structure stabilization of beta phase of Ni(OH)(2) nanoparticles during electrochemical cycling

Author(s)

Miguel, Fernando H. C. ^[1] ; Benedetti, Tania M. ^[1] ; Torresi, Roberto M. ^[1] ; Cordoba de Torresi, Susana I. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

• Document type: Journal article
• Source: Electrochemistry Communications; v. 48, p. 164-168, NOV 2014.
• Web of Science Citations: 4

Abstract

Pure beta badly crystallized, beta(bc)-Ni(OH)(2), and hybrid beta(bc)-Ni(OH)(2)/polypyrrole nanoparticles (NPs) were synthesized and immobilized by electrophoretic deposition. The influence of polypyrrole (Ppy) on the structural stability with cycling was evaluated by Quartz Crystal Microbalance with Dissipation. The results show that Ppy stabilizes the NP structure avoiding stress features provoked by the formation of gamma-NiOOH. Ppy remains oxidized during the entire process and, as it is doped with a big counter anion such as dodecylbenzenesulfonate (DBS-) which is not removed during cycling, avoids volumetric changes of Ni(OH)(2) leading to higher cyclability. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/02117-0 - Poly(ionic liquids) in electrochemical devices: polyelectrolytes for energy storage and conversion devices and stabilization of graphene and poly(3,4-etylenedioxidethiophene) (PEDOT) for electroactive films obtention
• Grantee: Tania Machado Benedetti
• Support Opportunities: Scholarships in Brazil - Post-Doctoral