An Electrically Rechargeable Zinc/Air Cell with an Aqueous Choline Acetate Electrolyte.

ABSTRACT: Due to the feasibility of an electrically rechargeable zinc/air cell made of a zinc foil as active material, an aqueous choline acetate (ChAcO) mixture as an electrolyte and a spinel MnCo2O4 (MCO) and NiCo2O4 (NCO) as a bi-functional oxygen catalyst was investigated in this work. The 30 wt.% water-containing aqueous ChAcO solution showed high contact angles close to those of KOH favoring triple-phase boundary formation in the gas diffusion electrode. Conductivity and pH value of 30 wt.% H2O/ChAcO amounted to 5.9 mS cm-1 and 10.8, respectively. Best results in terms of reversible capacity and longevity of zinc/air cell were yielded during 100 h charge/discharge with the MnCo2O4 (MCO) air electrode polarization procedure at 100 µA cm-2 (2.8 mA g-1zinc). The corresponding reversible capacity

SUBMITTER: Sakthivel M 

PROVIDER: S-EPMC7372399 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature