Spinel LiMn2O4 as Electrocatalyst toward Solid-State Zinc–Air Batteries

Efficient oxygen reduction reaction (ORR) electrocatalysts are the key to advancement of solid-state alkaline zinc–air batteries (ZAB). We demonstrate an electrocatalyst, spinel lithium-manganese oxide LiMn2O4 (LMO) by a simple hydrothermal method. Scanning electron microscope (SEM), X-ray diffraction (XRD), and Raman spectra indicate that as-synthesized presents nanoscale irregular-shaped particles with well-known structure. The polarization curve, chronoamperometery linear scanning voltammograms rotating disk electrode (RDE) results reveal possesses higher electrocatalytic activity than electrolytic manganese dioxide for ORR. A cell as air catalyst has long voltage plateau discharge capacity 188.4 mAh at constant current density 10 mA·cm−2. In summary, in which JT effect enables hoping between Mn3+ Mn4+ can be regarded effective robust catalyst.