One-pot hydrothermal synthesis of Mn3O4 nanorods grown on Ni foam for high performance supercapacitor applications

Abstract

Mn3O4/Ni foam composites were synthesized by a one-step hydrothermal method in an aqueous solution containing only Mn(NO3)2 and C6H12N4. It was found that Mn3O4 nanorods with lengths of 2 to 3 μm and diameters of 100 nm distributed on Ni foam homogeneously. Detailed reaction time-dependent morphological and component evolution was studied to understand the growth process of Mn3O4 nanorods. As cathode material for supercapacitors, Mn3O4 nanorods/composite exhibited superior supercapacitor performances with high specific capacitance (263 F · g-1 at 1A · g-1), which was more than 10 times higher than that of the Mn3O4/Ni plate. The enhanced supercapacitor performance was due to the porous architecture of the Ni foam which provides fast ion and electron transfer, large reaction surface area, and good conductivity.

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].…”

Direct and environmentally benign synthesis of manganese oxide/graphene composites from graphite for electrochemical capacitors

“…The specific capacitance of the Mn 3 O 4 / graphene composites had a maximum value of 367 F/g at a current density of 5 A/g under the preparation conditions used in this work. This value is higher than that of Mn 3 O 4 nanoparticle electrodes in literature (170e270 F/g) [25,26], which can be attributed to the conductivity of the graphene flakes.…”

Hierarchical Ni–Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors

“…and the other is the faradic charge transfer process (e.g., pseudocapacitors that employ electroactive materials of transition metal oxides/hydroxides and their composites). [21][22][23][24] To date, versatile and flexible electrodes including carbon textile, carbon fiber, gold layered fabric, and CNT coated cotton textile/paper substrates have been used as electrodes in pseudocapacitors owing to their good flexibility, light weight, good sustainability, and foldable nature. 19,20 Thus, extensive research efforts have been focused on improving the charge storage properties using various electroactive materials and conductive electrodes for pseudocapacitors.…”