Sol-Gel Routed NiMn₂O₄ Nanofabric Electrode Materials for Supercapacitors

Abstract

NiMn 2 O 4 (NMO) nanomaterials were prepared via a facile sol-gel process and small pieces of tissue paper were used as a template to obtain one-dimensional (1D) nanofabric shape. Connectivity of the nanoparticles in fabric shape was observed by field-emission scanning electron microscope and transmission electron microscope images. X-ray diffraction pattern was analyzed to confirm the pure phase and crystallinity of the end product. Energy dispersive X-ray spectroscopy was done to check the homogeneous distribution of the Ni, Mn and O elements. The 1D nanofabric NMO was further employed as an electrode material for supercapacitors (SCs). The cyclic voltammetry, galvanostatic charging/discharging and electrochemical impedance spectroscopy techniques were used to determine the supercapacitive properties of electrode materials. The high specific capacitance of 303 F g −1 was obtained at the current density of 0.5 A g −1 . Almost stable specific capacitance was obtained till 5000 cycles. The high specific capacitance and stability of the electrode material may be attributed to the fabric shape and connectivity of the particles where voids/gaps in between particles provide more accommodation for the ions. Asymmetric SC (ASC) device was also fabricated and its electrochemical performance was checked. Two yellow color light-emitting diodes and a motor fan were powered from series-connected two ASCs.

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn2O3: a nano-material for application in water splitting electro-catalysis

“…Low and broad diffraction peaks can be seen which are due to the small size and incomplete inner structure of the particles. 53,54 In addition, the uniform arrangement of Pd, Mn and oxygen favors the electro-catalytic performance of PdO-2Mn 2 O 3 . 54 The surface composition and oxidation states of the prepared PdO-2Mn 2 O 3 material was probed by X-ray photoelectron spectroscopy (XPS).…”

“…53,54 In addition, the uniform arrangement of Pd, Mn and oxygen favors the electro-catalytic performance of PdO-2Mn 2 O 3 . 54 The surface composition and oxidation states of the prepared PdO-2Mn 2 O 3 material was probed by X-ray photoelectron spectroscopy (XPS). The survey spectrum (Fig.…”

Large‐Scale Synthesis of Spinel NixMn3‐xO4 Solid Solution Immobilized with Iridium Single Atoms for Efficient Alkaline Seawater Electrolysis

“…Finally, the dry gel was transferred to the muffle furnace and heated at 800 °C for 4 h with a heating rate of 5 °C·min –1 . [ 58 ] The Ni x Mn 3‐x O 4 solid solution samples were prepared by altering the ratio of the precursors.…”

Facile Synthesis of Battery-Type CuMn2O4 Nanosheet Arrays on Ni Foam as an Efficient Binder-Free Electrode Material for High-Rate Supercapacitors

“…For example, Krishnan et al developed a MnCo 2 O 4 nanoflakes battery-type material for a supercapacitor using the rapid microwave-assisted technique and obtained a specific capacity of 74.44 mA h g −1 at 0.5 A g −1 [ 23 ]. The NiMn 2 O 4 synthesized by Krishna et al delivered a specific capacity of 33.66 mA h g −1 at 0.5 A g −1 [ 24 ]. By a simple hydrothermal route, Wei et al developed the nanostructured spinal NiMn 2 O 4 electrode and obtained a specific capacity of 73.61 mA h g −1 at 1 A g −1 with superb cycling stability (96% over 1000 cycles) [ 25 ].…”