Mn₃ O₄ nanoparticles on activated carbonitride by soft chemical method for symmetric coin cell supercapacitors

Abstract

Summary Trimanganese tetraoxide (Mn3O4) is limited in supercapacitor application due to its poor electrical conductivity and cycle stability. An effective strategy for improving its electrochemical performance is to be combined with good conductive materials, such as carbon materials. A facile method was developed to prepare a Mn3O4/activated carbonitride composite (MONC) as electrode material for supercapacitor. Mn3O4 particles with small size were homogeneously grown on the surface of activated carbonitride (NC). Notably, the addition of NC not only improves the electrical conductivity of Mn3O4 but also serves as a supporting matrix to maintain the stability of the composite. Electrochemical characterization results show that the specific capacitance of the composite can reach 180 F/g at a current density of 0.5 A/g, which is two times higher than that of Mn3O4 at the same current density. After 2000 cycles, the specific capacitance of MONC can be maintained at 80.2% of the initial specific capacitance. The symmetric coin cell (SCC) assembled by MONC as positive and negative electrodes shows large voltage window, excellent cycle stability, and superior energy/power densities. This work will be one of important references for the application of other transition metal oxides in energy storage devices.

Effect of NiO on organic framework functionalized ZnO nanoparticles for energy storage application

“…Furthermore, the redox peaks were also emerged due to N‐containing groups of incorporated organic compounds (C 8 H 19 N). N‐containing groups enhanced the pseudocapacitance behavior of electrode as observed by Pettong et al, Xie et al, and Zhou et al.…”

“…Supercapacitors (also known as electrochemical capacitors) have gained extensive research focus in the field of energy storage due to reasonable high power density, quick charging and discharging, safe operation, and optimum working conditions . The performance of a capacitor is critically depending on its electrode . Therefore, over recent years, the development of efficient supercapacitor electrode is the focus of attention among researcher …”

“…The performance of a capacitor is critically depending on its electrode . Therefore, over recent years, the development of efficient supercapacitor electrode is the focus of attention among researcher …”

“…Although their carbon‐based C–H–T revealed excellent capacitance of 423 F/g at 0.5 A/g, yet their research involved high temperature and toxic chemicals for modification and doping of carbon. Mn 3 O 4 NPs‐activated carbonitride composite (MONC) was synthesized as electrode material by Zhou et al The addition of activated carbonitride was found to enhance not only conductivity of Mn 3 O 4 but also improved pseudocapacitance behavior of Mn 3 O 4 by the introduction of nitrogen atom. All these current investigations, vividly supported that addition of carbon and/organic compounds can improve conductivity and capacitance of the electrode by introducing C, N, and O elements.…”

Hierarchitecture Co 2 (OH) 3 Cl@FeCo 2 O 4 composite as a novel and high‐performance electrode material applied in supercapacitor

“…[8][9][10] Although they have different energy storage mechanisms, the electrode material is still key point to enhance performance of supercapacitors. [11][12][13][14][15] Higher capacity and more electroactive sites are focal points in the developments of electrode materials. Among electrode materials, transition metal oxides (TMOs) show the higher performance ascribed to their complex valence states, while carbon materials usually shows a lower performance.…”