Jatropha oilcake (JOC), a major agro industrial co-product was effectively converted into activated carbons employing KOH mediated chemical process for supercapacitor applications. The activated carbons were synthesized by employing conventional (CC) as well as hydrothermal carbonization (HTC) processes and investigated their impact on their physicochemical properties. The graphitization degree of the pristine and activated biocarbons was investigated through XRD and RAMAN analysis. BET surface area analysis showed the enhanced specific surface area of the pristine carbons from 71.5 (CC) and 48.1 (HTC) m 2 /g into 678.1 (CC) and 746.7 m 2 /g (HTC) through KOH activation. The synthesized activated biocarbon materials were explored as the electrode material for supercapacitors. The electrochemical analysis of the fabricated symmetric supercapacitor showed the specific capacitance of 145.76 F/g and 174.78 F/g at 1 A/g for the activated biocarbons obtained respectively through conventional and hydrothermal carbonization processes. Also, they showed considerable energy density of 5.28 Whkg À 1 (CC) and 6.49 Whkg À 1 (HTC) at a power density of 248.6 and 265.09 W kg À 1 . Among the two different approaches, the hydrothermal process showed great promise for the production of renewable biomass-derived activated biocarbon materials for supercapacitor applications.

The goal of the current study is to theoretically evaluate the heat and mass transfer behavior of magnetohydrodynamic Casson and Williamson fluids as they pass through a stretched sheet with Brownian and thermophoresis effects. The evolution of high-density heat devices necessitates efficient thermal transportation. For these requirements, the concept of nanofluid plays an active role. This article describes the effects of Cattaneo–Christov. This study introduces new concepts such as motile microorganism bioconvection, non-Fourier heat flux, and activation energy. A Runge–Kutta-based shooting procedure is used to solve the problem. The effects of the relevant parameters on velocity, thermal, concentration, and motile microorganisms are depicted graphically. The computed reduced Nusselt, Sherwood, and motile density numbers are displayed in tables in this study. When compared to the Williamson fluid, the thermal and concentration fields of the Casson fluid are heavily influenced by the parameters.

The demand for vegetable oil is increasing for both food and non‐food applications, which leads to the generation of a huge amount of oil cakes. The rising annual production requires alternative applications for sustainable operations of oil mills, especially those involved in non‐edible oil production. Hence, the value‐added uses of oil cakes such as environment remediation (metal absorption), composite fabrication (as fillers, reinforcements), nanoparticle synthesis (as reducing and stabilizing agent), and production of carbonaceous materials (as carbon source) were extensively explored in recent years. Among them, the thermochemical conversion of oil cakes into carbonaceous materials (biochar and activated carbon) received great interest as the demand for biocarbon materials increases exponentially. Oil cake‐derived biocarbon materials found a wide range of technological applications. With this perspective, recent developments in oil cake‐derived carbon materials and their diverse applications are reviewed.

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