Valorizing palm date wastes for hybrid supercapacitor electrode synthesis and evaluation
Description
Climate and energy issues continue to drive researchers to develop fossil-free energy technologies that are both sustainable and scalable. In this work, date seeds (DS) are used to produce activated carbon (DSAC), which is then used as a supercapacitor electrode. The synthesis method uses KOH activation followed by Ar-flow calcination at 950°C. The produced DSAC has a high specific surface area of 1374 m2/g and a turbostratic microporous structure (pore size = 1.14 nm)in addition to oxygen functional groups (-C-O-, -OH). The DSAC electrode demonstrates a hybrid electric double-layer capacitor (EDLC) and pseudocapacitive properties, and produces an impressive specific capacitance of 916 F/g at 10 mV/s. The EDLC contribution of that is 90 F/g while the pseudocapacitive contribution is 826 F/g. Furthermore, it has retained 83.3% of its discharging capacity after 2000 cycles of galvanostatic charge and discharge at 10 A/g. Finally, the DSAC electrode is optimized for the less alkaline KOH 1M rather than the 3M one.
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Institutions
- South Valley University Faculty of EngineeringQena