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

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 m g 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, the capacitance is up to 427 F g (162 F cm). Even at a high current density of 50 A g, the capacitance can be maintained to a high value of 315 F g (120 F cm). After charging-discharging at a current density of 4.5 A g 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.

Synthesis of a Novel Petal‐Shaped Biomass‐Derived Carbon Material with Controlled Pore Structure and Nitrogen Content for Use in Supercapacitors

“…This overall structure of carbon fiber skeleton embedded with a large number of carbon nano‐flakes exhibit a high exposure degree of carbon material surface, which can provide more adsorption sites for electrons/ions. The more details of carbon fiber skeleton are shown in Figure c and the similar SEM image of carbon fiber skeleton is also observed on the garlic skin . The ordered fiber arrays are layer by layer between the carbon layers to form a loose carbon fiber skeleton.…”

“…The more details of carbon fiber skeleton are shown in Figure 3c and the similar SEM image of carbon fiber skeleton is also observed on the garlic skin. [37] The ordered fiber arrays are layer by layer between the carbon layers to form a loose carbon fiber skeleton. There are abundant pore structures with different pore size in carbon material framework ( Figure 3d).…”

Solid‐State Hybrid Supercapacitor Assembled from a Heterostructured Co−Ni Battery‐like Cathode and Supercapacitor‐Type Highly Disordered Carbon Nanosheets

“…The less ordered graphitic structure of the ACNS sample is also in accordance with the Raman spectrum (Figure S4c). Two obvious peaks located at ∼1335 and 1590 cm −1 correspond to the D‐band of the disordered graphite structure and G‐band for sp 2 ‐hybridized graphite of carbon materials . The relative intensity ratio of the D peak and G peak (I D /I G ) for the ACNS sample is 0.96, demonstrating the low graphitized degree with highly disordered structure of the prepared carbon material.…”

“…The N 2 AD isotherms along with the pore size distribution of the ACNS sample were shown in Figure i. The obtained isotherms display a Type I characteristic with a strong nitrogen adsorption below the relative pressure ( p / p 0 ) of 0.1, indicating the micropore feature of the as‐prepared sample . The calculated BET surface area and pore volume of the ACNS sample are 1332.5 m 2 g −1 and 0.13 cm 3 g −1 , respectively.…”

Template‐Induced Self‐Activation Route for Hierarchical Porous Carbon Derived from Interpenetrating Polymer Networks as Electrode Material for Supercapacitors

“…The two different types of polymers are interlaced together by permanent physical inter‐network entanglements with only occasional covalent bonds at the molecular level, which resist phase separation ,. This promising method can effectively overcome several regrettable drawbacks concerning the conventional synthesis strategies, such as tedious hard templates removal processes, rigorous sol‐gel drying condition and isolated non‐interconnected pores in single polymer components . Consequently, IPNs are one ideal choice for the preparation of porous carbons.…”