Structural Electrochemistry from Freestanding Polypyrrole Films: Full Hydrogen Inhibition from Aqueous Solutions

dc.creatorFernández Otero, Toribio
dc.creatorMartínez, Jose G.
dc.creatorFuchiwaki, Masaki
dc.creatorValero Conzuelo, Laura
dc.creatorFERNÁNDEZ OTERO, TORIBIO;;3181197
dc.creatorMARTINEZ BERNAL, JOSE GUADALUPE; 10083
dc.creatorFuchiwaki, Masaki;#0000-0002-9990-4960
dc.creatorVALERO CONZUELO, LAURA;;3181150
dc.creatorFERNÁNDEZ OTERO, TORIBIO
dc.creatorMARTINEZ BERNAL, JOSE GUADALUPE
dc.creatorFuchiwaki, Masaki
dc.creatorVALERO CONZUELO, LAURA
dc.date2016-02-29T16:27:03Z
dc.date2016-02-29T16:27:03Z
dc.date2013-10-31
dc.identifier1616-3028
dc.identifierhttp://ri.uaemex.mx/handle/123456789/32905
dc.descriptionFree-standing polypyrrole films, being the metal–polymer contact located several millimeters outside the electrolyte, give stationary closed coulovoltammetric (charge/potential) loop responses to consecutive potential sweeps from –2.50 V to 0.65 V in aqueous solutions. The continuous and closed charge evolution corroborates the presence of reversible film reactions (electroactivity), together high electronic and ionic conductivities in the full potential range. The closed charge loop demonstrates that the irreversible hydrogen evolution is fully inhibited from aqueous solutions of different salts up to –2.5 V vs Ag/AgCl. The morphology of the closed charge loops shows abrupt slope changes corresponding to the four basic components of the structural electrochemistry for a 3D electroactive gel: reduction-shrinking, reduction-compaction, oxidation-relaxation, and oxidation-swelling. Freestanding films of conducting polymers behave as 3D gel electrodes (reactors) at the chain level, where reversible electrochemical reactions drive structural conformational and macroscopic (volume variation) changes. Very slow hydrogen evolution is revealed by coulovoltammetric responses at more cathodic potentials than –1.1 V from strong acid solutions, or in neutral salts self-supported blend films of polypyrrole with large organic acids. Conducting polymers overcome graphite, mercury, lead, diamond, or carbon electrodes as hydrogen inhibitors, and can compete with them for some electro-analytical and electrochemical applications in aqueous solutions.
dc.languageeng
dc.publisherAdvanced Functional Materials
dc.relation24;9
dc.rightsopenAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectElectrochemistry
dc.subjectPolypyrrole
dc.subjectHydrogen
dc.subjectAqueous Solutions
dc.subjectBIOLOGÍA Y QUÍMICA
dc.titleStructural Electrochemistry from Freestanding Polypyrrole Films: Full Hydrogen Inhibition from Aqueous Solutions
dc.typeArtículo
dc.typearticle


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