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      Synthesis of garlic skin-derived 3D hierarchical porous carbon for high-performance supercapacitors.

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          Abstract

          A three-dimensional hierarchical porous carbon is synthesized via a facile chemical activation route with garlic skin as the precursor and KOH as the activating agent. The as-obtained carbon presents a high specific surface area of 2818 m2 g-1 and a hierarchical porous architecture containing macroporous frameworks, mesopores (2-4 nm), and micropores (0.6-1.0 nm). As the electrode material for a supercapacitor, due to its unique interconnected porous structure, this garlic skin-derived carbon exhibits excellent electrochemical performance and cycling stability. At a current density of 0.5 A g-1, the capacitance is up to 427 F g-1 (162 F cm-3). Even at a high current density of 50 A g-1, the capacitance can be maintained to a high value of 315 F g-1 (120 F cm-3). After charging-discharging at a current density of 4.5 A g-1 for 5000 cycles, the capacitance retention is as high as 94%. The results suggest that this garlic skin-derived 3D hierarchical porous carbon is a promising electrode material for high-performance supercapacitors.

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          Author and article information

          Journal
          Nanoscale
          Nanoscale
          Royal Society of Chemistry (RSC)
          2040-3372
          2040-3364
          Feb 01 2018
          : 10
          : 5
          Affiliations
          [1 ] School of Energy and Power Engineering, Shandong University, Jinan 250061, China. hankh@163.com.
          Article
          10.1039/c7nr07158b
          29335695
          16e008cc-4e9c-4855-a967-d280ce946d39
          History

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