“…have been employed in diverse applications such as catalysis, wastewater treatment, supercapacitors, sensors, and rechargeable batteries. 28 Mn 3 O 4 is particularly appealing in sensors or electrocatalysis owing to its high carrier mobility, low cost, chemical stability, fine biocompatibility, and environmental friendliness. 29,30 Because Mn 3 O 4 has abundant active sites with stability owing to its distinctive spinel structure, 31 it can act as an efficient catalyst in molecular adsorption and magnetism.…”