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The blending of waste tin tailings with graphene derived from waste rice husks in the production of high-specific capacitance supercapacitors was developed in this work. Alkaline treatment method was used to develop graphene from rice husks. The doping casting method was used to produce 0, 10, 20, and 30 wt% graphene with constant 20 wt% tin tailings. Cyclic voltammetry (CV), electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray diffractogram (XRD) were used to analyze the composite electrode material. The specific capacitance rises with an increase in the dopant graphene of up to 30% with a specific capacitance of 379.58 at a 5 mV/s scanning rate. The high specific capacitances obtained are within the standard for flexible supercapacitors. It was established that waste tin tailings and graphene derived from waste rice husks could be used in the production of low-cost supercapacitors. [ABSTRACT FROM AUTHOR]

In the past, ceramic materials were exclusively used as transmission insulators for high voltage. However, due to the drawbacks of ceramic materials, including their heavy weight, challenging production, and poor toughness, high-voltage transmission insulators are now being replaced by polymeric materials. The majority of the issues with ceramic insulators are addressed by polymeric insulators. This study aimed to enhance the toughness and insulating properties of an epoxy composite developed SiO2 nanoparticles obtained from rice husk. The samples were produced by the solution stir cast method. The microstructure, impact strength, fracture toughness, and insulation properties of the developed composite were determined. The toughness and insulating properties that have been reported are within the acceptable range for high-voltage insulators. The developed composite insulator was found to be capable of withstanding voltages of up to 14.9 kV. The developed composite might be utilized to produce electrical insulators with great toughness and good insulating properties. [ABSTRACT FROM AUTHOR]

A high performance supercapacitor was produced by synthesizing graphite using froth flotation and graphene from waste rice husk using the doped casting method. The composition of the graphene was kept constant (Gr0.3 g) and the graphite was varied (0.1–0.2 g). The supercapacitor was produced by the doping method. The microstructure, cyclic voltammetry, electrical impendence spectroscopy, and X-ray diffraction were determined. Increasing the concentration of graphite increases the specific capacitance of the graphene/graphite (Gr/G) composite electrode. Enhanced supercapacitors with a specific capacitance of 2842.43Fg−1 at a scan rate of 5 mV/s can be made using 0.2 g graphite doped with 0.3 g graphene. An increase in the surface area of the composite material facilitated fast ion and electron transportation, thereby improving its electrochemical properties. This research has shown that high-quality supercapacitor electrodes may be made from waste rice husk and graphite ore using froth flotation, chemical methods, and doping. [ABSTRACT FROM AUTHOR]

Minimum quantity lubricant (MQL) (nanofluids) is a promising method used in decreasing cutting force and surface roughness and improving tool and productivity. This work deals with the analysis of low-cost SiO2-derived from rice husk ash (SiO2-RHA) nanofluid on the machining of aluminum alloy. L9 Taguchi orthogonal array of nine (9) runs were used to determine the effect of lubrication condition, cutting speed, feed rate, and depth of cut on the turning operation of the aluminum alloy. Analysis of variance (ANOVA) indicates that SiO2-RHA nanofluid has a higher significant effect in lowering the tool wear and cutting force and good surface finish. The SiO2-RHA nanofluid has a contribution of 92.96%, 88.59%, and 93.40% in decreasing the cutting force and tool wear and good surface finish. It was established that the low-cost rice husk waste can be used in the production of nanofluid for the machining (turning operation) of aluminum alloy. [ABSTRACT FROM AUTHOR]

Due to the low toxicity, high theoretical capacity, abundant resources, low potential, of zinc oxide (ZnO), it is regarded as the next-generation lithium-ion battery anode material. However, because of the significant drawback in terms of volume expansion during the charge-discharge cycles, ZnO is easily pulverized and agglomerated. In this research work, we synthesize 0.5 g of rice husk-derived graphene (R 0.5) and 1.0 g of ZnO (Z 1.0) composite (R 0.5 Z 1.0) to accommodate the volume expansion of ZnO during the charge-discharge process as a next-generation lithium-ion battery anode. Rice husk as a graphene source will support the future usage of bio-based materials for active material synthesis. The samples were characterized via SEM, XRD, and Fourier infrared spectroscopy, and with a discharge capacity of 895.2 mAhg−1 at a current density of 200 mAg−1 after 110 cycles, the composite material demonstrated remarkable Li storing characteristics and electrochemical performance as an anode for lithium-ion battery application. [Display omitted] • Rice husk is a potential graphene source via chemical activation. • Rice husk derived graphene and zinc oxide composite is a promising anode for lithium-ion battery application. • Faradic charge transfer resistance of zinc oxide can be greatly reduced by incorporating rice husk derived graphene. • Agglomeration challenge of zinc oxide can be reduced by introducing rice husk derived graphene. [ABSTRACT FROM AUTHOR]