High-performance asymmetric supercapacitor made of NiMoO₄ nanorods@Co₃O₄ on a cellulose-based carbon aerogel

Abstract

In this study, a new nanoporous material comprising NiMoO4 nanorods and Co3O4 nanoparticles derived from ZIF-67 supported by a cellulose-based carbon aerogel (CA) has been successfully synthesized using a two-step hydrothermal method. Due to its chemical composition, the large specific surface and the hierarchical porous structure, the NiMoO4@Co3O4/CA ternary composite yields electrodes with an enhanced specific capacitance of 436.9 C/g at a current density of 0.5 A/g and an excellent rate capability of 70.7% capacitance retention at 5.0 A/g. Moreover, an advanced asymmetric supercapacitor (ASC) is assembled using the NiMoO4@Co3O4/CA ternary composite as the positive electrode and activated carbon as the negative electrode. The ASC device exhibits a large capacitance of 125.4 F/g at 0.5 A/g, a maximum energy density of 34.1 Wh/kg at a power density of 208.8 W/kg as well as a good cyclic stability (84% after 2000 cycles), indicating its wide applicability in energy storage. Finally, our results provide a general approach to the construction of CA and MOF-based composite materials with hierarchical porous structure for potential applications in supercapacitors.

N and P Co‐doped Green Waste Derived Hierarchical Porous Carbon as a Supercapacitor Electrode for Energy Storage: Electrolyte Effects

“…At various current densities, the specific capacitances of WCs were measured (figure not shown) and found to decrease with increasing current density. The electrolytes do not have enough time to permeate into the electrode pores and carry out complete redox reactions at high current densities, resulting in a drop in specific capacitance as current density increases [23,46–48] . At high current density, the EDL capacitance and pseudocapacitance have been significantly reduced, resulting in a low total specific capacitance.…”

“…The electrolytes do not have enough time to permeate into the electrode pores and carry out complete redox reactions at high current densities, resulting in a drop in specific capacitance as current density increases. [23,[46][47][48] At high current density, the EDL capacitance and pseudocapacitance have been significantly reduced, resulting in a low total specific capacitance. Furthermore, the GCD curves of NPW in various electrolytes were investigated at various current densities (0.5-10 A g À 1 ).…”

Nanostructured mixed transition metal oxide spinels for supercapacitor applications

“…The performance of this device is attributed to the synergistic effect of the good conduction capability of the porous 3D structure derived from the carbon aerogel and the large specific capacitance contributed by the transition metal oxides. 46…”

“…The performance of this device is attributed to the synergistic effect of the good conduction capability of the porous 3D structure derived from the carbon aerogel and the large specific capacitance contributed by the transition metal oxides. 46 Shape controlled Co 3 O 4 (nanorods, nanocubes, nanosheets, hierarchical, etc.) were studied using various approaches which displayed potential SC properties and performances due to the aforementioned Co II -Co III -Co IV interactions, high surface area…”

Lx‐β‐NiMoO4 (L = None, Al, V, Fe, Co) Nanocomposites: Facile Solid‐State Synthesis, Magnetic, Optical, and Electrochemical Properties

“…Application of NiMoO 4 as catalyst in a wide variety of industrial reactions, such as hydrodesulfurization, hydrodenitrogenation, water-gas shift reaction, steam reforming, etc., is suggested. [13] NiMoO 4 has been fabricated by different methods including hydrothermal, [14][15][16][17][18][19][20][21][22] thermal complex decomposition, [23,24] mechanochemical, [25] sonochemical, [26,27] microwave sintering, [28] sol-gel, [29,30] precipitation, [31,32] solvothermal, [33] microwave, [34] etc. However, solid-state route is one of the simplest and extensive synthesis methods to develop various types of materials for certain applications.…”