The role of adsorbed ions during electrocatalysis in ionic liquids

The effects of electrode–adsorbate interactions on electrocatalysis at Pt in ionic liquids are described. The ionic liquids are diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], dimethylethylammonium trifluoromethanesulfonate, [dmea][TfO], and diethylmethylammonium bis(trifluoromethanesulfonyl)imide, [dema][Tf2N]. Electrochemical analysis indicates that a monolayer of hydrogen adsorbs onto Pt during potential cycling in [dema][[TfO] and [dmea][TfO]. In addition, a prepeak is observed at lower potentials than that of the main oxidation peak during CO oxidation in the [TfO]−-based liquids. In contrast, hydrogen does not adsorb onto Pt during potential cycling in [dema][Tf2N] and no prepeak is observed during CO oxidation. By displacing adsorbed ions on Pt surfaces with CO at a range of potentials, and measuring the charge passed during ion displacement, the potentials of zero total charge of Pt in [dema][TfO] and [dmea][TfO] were measured as 271 ± 9 and 289 ± 10 mV vs RHE, respectively. CO displacement experiments also indicate that the [Tf2N]− ion is bound to the Pt surface at potentials above −0.2 V and the implications of ion adsorption on electrocatalysis of the CO oxidation reaction and O2 reduction reaction in the protic ionic liquids are discussed

Towards More Active and Stable Electrocatalysts for Formic Acid Electrooxidation: Antimony-Decorated Octahedral Platinum Nanoparticles

This work has been financially supported by the MICINN (Feder) of Spain and the Generalitat Valenciana through projects CTQ2010-16271 and PROMETEO/2009/45. F.J.V.I. also thanks the European Social Funding

Geles poliméricos para baterías secundarias de aluminio, preparados con el disolvente eutéctico profundo uralumina (urea:AlCl3) y poli(óxido de etileno) de distintos pesos moleculares y en distintas concentraciones

[EN] In the videos these properties are illustrated in three different gels: PEO9-5-U150 is a gel prepared with 5 wt% of poly(ethylene oxide) of molecular weight 900000 g/mol. PEO50-1-U150 is a gel prepared with 1 wt% of poly(ethylene oxide) of molecular weight 5000000 g/mol. PEO80-1-U150 is a gel prepared with 5 wt% of poly(ethylene oxide) of molecular weight 8000000 g/mol.[ES] En los vídeos aparecen ilustradas su tenacidad, su elasticidad y su carácter pegajoso en geles preparados con: Poli(óxido de etileno) de peso molecular 8000000 g mol-1, añadido a la uralumina al 1 % en peso (PEO80-1U150), Poli(óxido de etileno) de peso molecular 5000000 g mol-1 añadido también al 1% en peso (PEO50-1-U150) y Poli(óxido de etileno) de peso molecular 900000 g mol-1 añadido al 5% en peso (P9-5-U150).[EN] Polymer gel electrolytes for secondary aluminium batteries, prepared with the deep eutectic solvent uralumina (urea:AlCl3) and poly(ethylene oxide) of different molecular weight and at different concentrations. These gels are elastic, tough, thermoreversible and wet well the electrodes, being very sticky.[ES ]Geles poliméricos para baterías secundarias de aluminio, preparados con el disolvente eutéctico profundo uralumina (urea:AlCl3) y poli(óxido de etileno) de distintos pesos moleculares y en distintas concentraciones. Los geles son elásticos, tenaces, termorreversibles y se pegan muy bien a los electrodos, por lo que son excelentes electrolitos en gel.The authors acknowledge financial support from project European Union H2020-FETOPEN-1-2016-2017 call (G A. No. 766581, SALBAGE project). All calculations were carried out at the Wrocław Center for Networking and Supercomputing, Grant 346.Peer reviewe