Kalisz Justyna, Nogala Wojciech, Adamiak Wojciech, Gocyla Mateusz, Girault Hubert H, Opallo Marcin
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.
Laboratoire d'Electrochimie Physique et Amaytique, Ecole Polytechnique Federale de Lausanne, EPFL, Valais, Wallis, Rue d'Industrie 17, 1950, Sion, Switzerland.
Chemphyschem. 2021 Jul 2;22(13):1352-1360. doi: 10.1002/cphc.202100219. Epub 2021 May 25.
H O is a versatile chemical and can be generated by the oxygen reduction reaction (ORR) in proton donor solution in molecular solvents or room temperature ionic liquids (IL). We investigated this reaction at interfaces formed by eleven hydrophobic ILs and acidic aqueous solution as a proton source with decamethylferrocene (DMFc) as an electron donor. H O is generated in colorimetrically detectable amounts in biphasic systems formed by alkyl imidazolium hexafluorophosphate or tetraalkylammonium bis(trifluoromethylsulfonyl)imide ionic liquids. H O fluxes were estimated close to liquid|liquid interface by scanning electrochemical microscopy (SECM). Contrary to the interfaces formed by hydrophobic electrolyte solution in a molecular solvent, H O generation is followed by cation expulsion to the aqueous phase. Weak correlation between the H O flux and the difference between DMFc/DMFc redox potential and 2 electron ORR standard potential indicates kinetic control of the reaction.
过氧化氢是一种用途广泛的化学物质，可通过在分子溶剂或室温离子液体（IL）中的质子供体溶液中进行氧还原反应（ORR）生成。我们以十甲基二茂铁（DMFc）作为电子供体，研究了由11种疏水性离子液体和酸性水溶液作为质子源形成的界面上的该反应。在由六氟磷酸烷基咪唑鎓或双（三氟甲基磺酰基）亚胺四烷基铵离子液体形成的双相体系中，可产生比色法可检测量的过氧化氢。通过扫描电化学显微镜（SECM）估计了靠近液 - 液界面的过氧化氢通量。与分子溶剂中疏水电解质溶液形成的界面相反，过氧化氢生成后阳离子会被驱赶到水相中。过氧化氢通量与DMFc / DMFc氧化还原电位和2电子ORR标准电位之间的差异之间的弱相关性表明该反应受动力学控制。
