NiO‐Co₃O₄‐rGO as an Efficient Electrode Material for Supercapacitors and Direct Alcoholic Fuel Cells

Abstract

Transition metal oxides can be performant electrode materials for supercapacitors and alcohol oxidation if their conductivity and capacity are improved. Herein, an advanced nanocomposite material made of NiO‐Co3O4 on reduced graphene oxide (rGO) is synthesized by a one‐step hydrothermal method for supercapacitors and methanol/ethanol oxidation. It is demonstrated that the nanocomposite is a promising material for energy storage as NiO‐Co3O4‐rGO supercapacitor electrodes achieve a specific capacity of 149 mAh g−1 (894 F g−1) at a current density of 0.5 A g−1, the discharge time of 689 s, and excellent stability of 95% after 6000 cycles. Moreover, NiO‐Co3O4‐rGO shows a current density of 15 and 10 mA cm−2 in methanol and ethanol oxidation reactions, respectively, along with excellent stability.

MoS2/Ni3S2/Reduced Graphene Oxide Nanostructure as an Electrocatalyst for Alcohol Fuel Cells

“…Today, designing and manufacturing devices in the field of clean energy have become one of the most significant fields of science in the world. These devices include solar cells, batteries, supercapacitors, , and fuel cells . Among fuel cells, direct alcohol fuel cells (DAFCs), in particular methanol and ethanol fuel cells, due to the simple structure of these alcohols and their availability, as well as the suitable working temperature range, have been considered more than other fuel cells. − …”

Fabrication of Mn3O4-CeO2-rGO as Nanocatalyst for Electro-Oxidation of Methanol

“…Moreover, we investigated NiCo 2 O 4 nanorods/reduced graphene oxide (rGO) [ 39 ], MoS 2 /Ni 3 S 2 /rGO [ 40 ], NiO-Co 3 O 4 -rGO [ 41 ], and MgCo 2 O 4 /rGO [ 42 ] as catalysts for methanol oxidation in previous works, and our results show that the synergetic effect between metal oxides/sulfides and reduced graphene oxide improves the catalytic activity of the catalyst. These catalysts were synthesized by the hydrothermal method.…”

Dielectric Properties Investigation of Metal–Insulator–Metal (MIM) Capacitors

“…Metal-insulator-metal (MIM) dielectric capacitors (DCs), as one of the crucial and typical components, have been widely used in silicon integrated RF and ICs devices due to their low resistance and low parasitic capacitance [1][2][3][4][5][6][7][8]. In recent years, a great number of research studies have been devoted to developing energy and capacitance densities in energy storage fields, especially for supercapacitors (SCs) [9][10][11]. Nonetheless, the intrinsic characteristics of SCs, such as low operation voltage and poor working frequency, have greatly limited their electronic applications [12][13][14].…”