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Title: | Electrochemistry of hydrogen evolution in ionic liquids aqueous mixtures | Authors: | Amaral, L. Cardoso, D. S.P. Šljukić Paunković, Biljana Santos, D. M.F. Sequeira, C. A.C. |
Keywords: | A. Organic compounds;C. Impedance spectroscopy;D. Catalytic properties;D. Electrochemical properties;D. Energy storage | Issue Date: | 1-Apr-2019 | Journal: | Materials Research Bulletin | Abstract: | Use of room-temperature ionic liquids (RTILs) as electrolyte additives for highly efficient alkaline water electrolysis at low temperatures is evaluated. The hydrogen evolution reaction (HER) was studied with platinum cathode in 8 M KOH solution with and without addition of 2 vol.% of [Emim][MeSO3] in the 25–85 °C temperature range using voltammetry, chronoamperometry and electrochemical impedance spectroscopy measurements. Catalytic effect of IL's presence in the electrolyte is evidenced for temperatures up to 45 °C by an increase of the exchange current density values, as well as a significant decrease of the overall impedance in the entire potential range. Thus, a lower activation energy of 38 kJ mol−1 is determined for HER in IL-added KOH compared to that of 48 kJ mol−1 for HER in IL-free KOH. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/364 | ISSN: | 0025-5408 | DOI: | 10.1016/j.materresbull.2018.04.041 |
Appears in Collections: | Journal Article |
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