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.

The development of active and stable catalysts is essential for the commercialization of direct alcohol fuel cells. In this work, we introduce a MoS₂/Ni₃S₂/rGO catalyst as a cost-effective, stable, and high-performance catalyst for application in alcohol fuel cells. MoS₂/Ni₃S₂ and its hybrid with reduced graphene oxide (rGO) are synthesized and evaluated as nanocatalysts in the alcohol (methanol and ethanol) electro-oxidation process in alkaline media. The effects of temperature and scanning rate are investigated. Voltammetry results show that MoS₂/Ni₃S₂/rGO has good catalytic efficiency and excellent stability of 106 and 104% after 200 consecutive CV cycles for MOR and EOR, respectively. The synergic effect of starfish Ni₃S₂ and the coated porous MoS₂ facilitates the absorption of hydroxyl ions and alcohols on the surface of the catalyst, while rGO enlarges the specific surface area and the electrical conductivity of the electrocatalyst.

We have developed a highly sensitive sensor of ZnFe₂O₄/reduced graphene oxide (ZnFe₂O₄/RGO) nanocomposite for electrochemical detection of hydrazine, fabricated by a simple hydrothermal protocol. Subsequently, a screen-printed electrode (SPE) surface was modified with the proposed nanocomposite (ZnFe₂O₄/RGO/SPE), and revealed an admirable electrocatalytic capacity for hydrazine oxidation. The ZnFe₂O₄/RGO/SPE sensor could selectively determine micromolar hydrazine concentrations. The as-produced sensor demonstrated excellent ability to detect hydrazine due to the synergistic impacts of the unique electrocatalytic capacity of ZnFe₂O₄ plus the potent physicochemical features of RGO such as manifold catalytic sites, great area-normalized edge-plane structures, high conductivity, and large surface area. The hydrazine detection using differential pulse voltammetry exhibited a broad linear dynamic range (0.03–610.0 µM) with a low limit of detection (0.01 µM).

Binary transition metal oxides with encouraging electrocatalyst properties have been suggested as electrode materials for supercapacitors and methanol oxidation. Hence, in this work, a binary mixed metal oxide based on nickel and manganese (MnNi ₂ O ₄ ) and its hybrid with reduced graphene oxide were synthesized by a one-step hydrothermal method. After physical and morphological characterization, the potential of these nanostructures was investigated for use as supercapacitor electrodes and methanol electro-oxidation. The results of the electrochemical analysis showed a substantial effect of adding rGO to the MnNi ₂ O ₄ . The MnNi ₂ O ₄ /rGO hybrid electrode supercapacitor exhibited good stability of 93% after 2000 consecutive CV cycles and a specific capacitance of 575 F g ⁻¹ at the current density of 0.5 A g ⁻¹ . Furthermore, the application of this hybrid nanomaterial in the methanol electro-oxidation reaction (MOR) indicated its appropriate electrochemical efficiency and stability in methanol oxidation. Our results show that MnNi ₂ O ₄ /rGO can be considered as a promising electrode material for energy applications.