Facile synthesis of functionalized porous carbon with three-dimensional interconnected pore structure for high volumetric performance supercapacitors

High Volumetric Energy Density Asymmetric Supercapacitors Based on Well‐Balanced Graphene and Graphene‐MnO2 Electrodes with Densely Stacked Architectures

“…Based on the total mass of two electrodes, including active material, binder and carbon black, DSG//G‐MnO 2 still shows a high energy density of 47.2 Wh kg −1 . Simultaneously, the bulk density of two electrodes is 1.15 g cm –3 , the assembled DSG//G‐MnO 2 ASC can deliver a high volumetric energy density up to 54.4 Wh L –1 at a power density of 207.4 W L –1 , much higher than those of our previously reported carbon‐based symmetric supercapacitors in aqueous electrolytes (Figure f) . Therefore, the design of high bulk density of electrode materials with high capacitance is beneficial for the enhanced volumetric performance supercapacitors.…”

Encapsulating selenium into macro-/micro-porous biochar-based framework for high-performance lithium-selenium batteries

“…For instance, porous biochar obtained from the biomass precursors, such as peanut shell, silk, banana peel, pig bone, rice husk, crab shell, shiitake mushroom, bamboo, ginkgo shells, soybean, fungi and olive stone, have been successfully applied as electrode materials of LIBs and supercapacitors or as matrices to host active substances for Li-S and Li-Se cathodes [17,24,25,[33][34][35][36][37][38][39][40][41][42].…”

Biomass-derived carbon materials with structural diversities and their applications in energy storage

“…Among the activating agents, KOH has been explored for the activation of biomass-derived carbons in elm samara [91], honeysuckle [121], lignin [151], cabbage leaves [152], willow catkins [80] and so on [108,153]. For example, our group prepared a series of biomass-derived carbons by one-step activating cattail [154], willow catkin [81], bacterial cellulose [61], soybeans [130], and wheat flour [136] with KOH activation. In a typical example, wheat flour and KOH were firstly mixed with a mass ratio of 1:1 and subsequent activation at 700 for 2 h. Compared with the sample without KOHactivation (5 m 2 g −1…”

“…. . tion of biomass material itself has abundant nitrogen element, such as soyabean [129,130], okara [96], tofu [131], crab and shrimp shells [49,132,133], oatmeal [22], endothelium corneum gigeriae galli [115], silk [98], chitosan [100], potato waste residue [134], palm-leaf [135], grlatin [35], algae [122]. The nitrogen content in these biomass-derived carbon is generally more than 4%.…”

“…More importantly, the as-assembled symmetric supercapacitor delivers superior volumetric energy density of 21 W h L −1 . Subsequently, our group successfully synthesized a functionalized porous carbon through heattreatment of KOH-soaked soybeans [130]. The as-obtained carbon material showed O, N-doped interconnected porous carbon framework, high surface area (580 m 2 g −1…”