Polyetheramide Templated Synthesis of Monodisperse Mn3O4 Nanoparticles with Controlled Size and Study of the Electrochemical Properties

Abstract

Monodisperse Mn3O4 nanoparticles were prepared solvothermally starting from manganese acetate by using polyether amide block copolymers (Pebax2533) as a template in isopropanol. The diameter of the nanoparticles in the range of 8.7 nm∼31.5 nm was decreased with increase of Pebax2533 concentration. The electrochemical properties and application in supercapacitor of Mn3O4 nanoparticles were further studied. The results showed that smaller nanoparticles had a larger capacitance. The higher capacitance of 217.5 F/g at a current density of 0.5 A/g was obtained on 8.7 nm Mn3O4 nanoparticles. The specific capacitance retention of 82% was maintained after 500 times of continuous charge-discharge cycles.

Tailoring the size and electrochemical performance of Mn3O4 nanoparticles by controlling the precipitation process

“…As shown in Fig. S1 and S2, the CV curves of the two samples at scan rates from 5 to 100 mV s -1 present typical rectangular shape similar to that of EDLCs within a much wider potential window (1.2 V) than that reported in other works (0.8-1 V) [15,[29][30][31][32][33][34]. The rectangular shape of CV curves indicates the linear dependence of the stored charge with the width of the potential window, suggesting the similar electrochemical behavior of Mn 3 O 4 nanoparticles to EDLCs [35].…”

Tailoring Vapor-Phase Fabrication of Mn3O4 Nanosystems: From Synthesis to Gas-Sensing Applications

“…Manganese oxides, including Mn 2 O 3 , Mn 3 O 4 , and MnO 2 , have been extensively investigated thanks to their multitude of accessible oxidation states and diversified electronic, structural, and chemical properties. − Among these systems, α-Mn 3 O 4 , a p-type semiconductor ( E G ≈ 2.3 eV) − with low cost, large abundance, and environmental compatibility, − has attracted an increasing interest for various eventual applications, encompassing electronic devices, , electrochromics, , batteries, , electrochemical capacitors, ,,,, heterogeneous (photo)­catalysts, ,,,,,, and sensors. Concerning the latter field, Mn 3 O 4 -based systems have been utilized for the amperometric determination of hydrogen peroxide, , bisphenol, and nimorazole drug, nonenzymatic glucose sensing, electrochemical detection of Na + ions, 2-butanone, hydrazine and biosensors for fish freshness monitoring, detection of heavy metals in aqueous solutions, potentiometric O 2 sensing, and cataluminescence sensing of acetone and H 2 S, as well as impedimetric sensors for humidity and mechanical pressure .…”

“…Currently, various studies have focused on the preparation of Mn 3 O 4 systems in the form of powders, ,,,,,,,− , whereas modern frontiers concern the tailored fabrication of supported nanosystems that enable to overcome the disadvantages associated with powdered materials. , Nevertheless, so far only a few works have reported on supported Mn 3 O 4 for gas sensors. ,,, …”

Temperature‐dependent synthesis of Mn 3 O 4 nanostructures by microwave irradiation method for high‐performance supercapacitors

“…7,8 Different synthesis methods and chemical compositions may affect the catalyst morphology and structure, which may change the catalytic activity. 9 Mn 3 O 4 nanoparticles have been synthesized by various methods, including polyetherimide-templated (spherical, 8.7-31.5 nm), 10 chemical precipitation (spherical, ~20 to 50 nm), 11 ultrasound-assisted ball milling (small size, ~30 nm), 12 hydrothermal (nanorods, 5-30 nm), 13 solvothermal (irregular, 12-40 nm), 14 sol-gel (spherical, 1 μm), 15 combustion (spherical, ~43 nm), 16 low temperature (spherical, 35 nm), 17 and microwave combustion (spongy aggregates, 28.08 nm) synthesis methods. 18 Among these, microwave-assisted synthesis methods have certain advantages, including simple procedure, rapid and selective heating, energy-saving, higher yields, high purity, small and narrow particle size distribution, lower processing cost, and eco-friendliness.…”