Erman Taer, - and Apriwandi, - and Miftah Ainul Mardiah, - and Awitdrus, - and Rika Taslim, - (2022) Synthesis free-template highly micro-mesoporous carbon nanosheet as electrode materials for boosting supercapacitor performances. International Journal of Energy Research, 46. ISSN 1099-114X

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Abstract

Porous carbon 2D nanosheets (CNSs) with micro-mesopores interconnected are indispensable for energy conversion systems and storage applications. Herein, we synthesize free-template highly micro-mesoporous carbon nanosheet as electrode material for boosting supercapacitor performances. The activated carbon nanosheets derived from bio-waste were prepared by chemi- cal impregnation followed by high-temperature pyrolysis without hard/soft/ salt template-assisted and free-binder adhesives. Garlic skin wastes were selected as a precursor. Furthermore, activated carbon was designed in pellet/ coin solids without the addition of binder materials. The porous carbon pellets exhibit a thin 2D nanosheet structure of 15 nm followed by unique wooden labyrinth-like and rod-like structures. The result showed that the impregnation of different chemical concentrations increases the surface area to 273% as high as 1002.920 m2 g1 with a total volume of 1.3270 cm3 g1 . Moreover, the meso- porosity dominated 66.4%, followed by sub-ultra-micropores. In the symmetric supercapacitor, the carbon nanosheet boosted the specific capacitance almost 3-fold to 320.95 F g1 in the aqueous electrolyte of 1 M H2SO4. The supercapa- citor cell has a high energy density of 43.12 Wh kg1 and power density of 161.99 W kg1 at a constant current density of 1.0 A g1 . This work proposes a more effective, green, efficient, and controlled approach to obtain bio-waste- based porous carbon 2D nanosheet with a controlled pore structure for energy conversion and storage systems. Novelty Statement The novelty of this study is a green synthesis has possessed highly micro- mesopores nanosheet bio-waste. 2D nanosheet was prepared free-template and free-binder. Sub-ultra-micropores were confirmed with dominated mesoporos- ity of 66.8%. Carbon nanosheet boosted specific capacitance almost 3-fold to 320.95 F g1 .

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