Wrinkled Flower-Like rGO intercalated with Ni(OH)₂ and MnO₂ as High-Performing Supercapacitor Electrode

Abstract

This study reports a simple one-step hydrothermal method for the preparation of a Ni(OH) 2 and MnO 2 intercalated rGO nanostructure as a potential supercapacitor electrode material. Having highly amorphous rGO layers with turbostratic and integrated wrinkled flower-like morphology, the as-prepared electrode material showed a high specific capacitance of 420 F g –1 and an energy density of 14.58 Wh kg –1 with 0.5 M Na 2 SO 4 as the electrolyte in a symmetric two-electrode. With the successful intercalation of the γ-MnO 2 and α-Ni(OH) 2 in between the surface of the as-prepared rGO layers, the interlayer distance of the rGO nanosheets expanded to 0.87 nm. The synergistic effect of γ-MnO 2 , α-Ni(OH) 2 , and rGO exhibited the satisfying high cyclic stability with a capacitance retention of 82% even after 10 000 cycles. Thus, the as-prepared Ni(OH) 2 and MnO 2 intercalated rGO ternary hybrid is expected to contribute to the fabrication of a real-time high-performing supercapacitor device.

Compressible zinc‐ion hybrid supercapacitor and piezoresistive sensor based on reduced graphene oxide/polypyrrole modified melamine sponge

“…[9] Carbon materials have good electrical conductivity, which is conducive to improving the charge-discharge cycling stability and rate performance. The specific capacity can be further enhanced when they are integrated with other active materials (conducting polymers, [10,11] metal oxides, [12,13] metal hydroxides, [14] etc.). However, the compressive performance of the carbon-based electrodes is relatively poor because the structure of carbonbased skeletons is easy to be destroyed by high stress/ strain.…”

Preparation of Manganese Oxide Nanoparticles with Enhanced Capacitive Properties Utilizing Gel Formation Method

“…The development of potential power sources to compete with ever-increasing energy demands is a significant worldwide issue . With the growth of the market for portable electronic devices and hybrid electric vehicles, the need for energy storage devices is increasing. , Batteries, fuel cells, and supercapacitors are the most efficient and effective electrochemical energy conversion and storage technologies. − Due to various advantages, including environment-friendly, high power density, low cost, and so on, supercapacitors have attracted massive attention in recent research activities in the energy sector. − However, supercapacitors have a lower energy density than batteries, and hence increasing their energy density to that of batteries is desirable. , While the performances of supercapacitors are mainly determined by the electrode material rather than the construction mechanism, it is important to develop the most effective electrode materials from available sources using facile routes. , …”

“…Because of their high theoretical specific capacitance, nanostructured metal oxides of transition metals have been identified as viable electrode materials for supercapacitors recently. ,− , Various metal oxides of transition metals, including oxides of manganese, ,,, nickel, iron, and titanium, have been reported for their potentiality as supercapacitor electrode materials. Even though ruthenium oxide has very high specific capacitance (720 F g –1 ) and still performs electrochemically better as an electrode material, the high cost and toxicity of hydrous ruthenium oxide have limited its usage. , As a result, considerable efforts have been put into exploring possible low-cost and available electrode materials with good capacitive properties.…”

“…5−8 However, supercapacitors have a lower energy density than batteries, and hence increasing their energy density to that of batteries is desirable. 5,6 While the performances of supercapacitors are mainly determined by the electrode material rather than the construction mechanism, it is important to develop the most effective electrode materials from available sources using facile routes. 1,2 Because of their high theoretical specific capacitance, nanostructured metal oxides of transition metals have been identified as viable electrode materials for supercapacitors recently.…”

“… 4 − 6 Due to various advantages, including environment-friendly, high power density, low cost, and so on, supercapacitors have attracted massive attention in recent research activities in the energy sector. 5 − 8 However, supercapacitors have a lower energy density than batteries, and hence increasing their energy density to that of batteries is desirable. 5 , 6 While the performances of supercapacitors are mainly determined by the electrode material rather than the construction mechanism, it is important to develop the most effective electrode materials from available sources using facile routes.…”