Hierarchical structured carbon derived from bagasse wastes: A simple and efficient synthesis route and its improved electrochemical properties for high-performance supercapacitors

From Trash to Treasure: Direct Transformation of Onion Husks into Three-Dimensional Interconnected Porous Carbon Frameworks for High-Performance Supercapacitors in Organic Electrolyte

“…As shown in Fig. 3a, XRD pattern of the OHCF-1 exhibits two broad diffraction peaks at 2θ = 24.7 and 43.3° which can be assigned to (002) and (101) crystallographic plane of graphite, respectively [21][22][23]. The broad and low intensity peaks suggest that the as-obtained three samples are disordered turbostratic carbons with lower degree of graphitization [32].…”

“…The TLC based supercapacitor displays a high specific capacitance of 330 F/g at 1 A/g in KOH electrolyte. Bagasse-derived carbon (BC) is prepared via hydrothermal carbonization combined with KOH activation process, the product exhibits a high specific capacitance of 320 F/g at 0.5 A/g in KOH electrolyte [23]. On the other hand, employing noaqueous electrolytes to expanding the potential window to further enhance the energy densities is also a hot topic in the field of supercapacitors despite the slow progress has been made compared with those of aqueous electrolytes.…”

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

“…The hierarchical porous carbon has high energy storage capacity and excellent rate capability. So far, various biomass, such as bagasse [113,114], endothelium corneum gigeriae galli [115], silk [98], auricularia [116][117][118], spores [53], lignin [119], cellulose [120], cotton [73], honeysuckle [121], lotus seedpods [59], enteromorpha [122,123], willow catkins [78], sheep manure [124], tobacco rods [125], corn leaf [126], bacterial cellulose [62], have been widely used as precursors to prepare hierarchical porous carbons through carbonization and activation process. Hou et al [98] have prepared hierarchical porous N-doped carbon nanosheets (HPNC-NSs) from natural silk by the metal salt activation-graphitization (Fig.…”

“…Recently, the HTC of biomass precursors, including eucalyptus sawdust [160], fungi [117,161], papyrifera bark [162], pine cones [163], tobacco rods [125], and bagasse [113], has been extensively explored for the preparation of carbon materials at 180-250°C, owing to its simplicity, cost-effective and nonpollution [164]. The chemical reaction involved in the HTC process comprises five steps: hydrolysis, dehydration, decarboxylation, polymerization, and aromatization [30].…”

Rapid synthesis of chitin‐based porous carbons with high yield, high nitrogen retention, and low cost for high‐rate supercapacitors

“…Porous carbons (PCs), particularly with the following features (a) large ions-accessible-specific surface areas (SSAs) to supply sufficient active sites for electrolyte ions storage, 8,9 (b) hierarchical pore structure to facilitate fast diffusion of electrolyte ions into pores at high current loads, 10,11 (c) three-dimensional (3D) interconnected porous framework to ensure fast transfer of electrolyte ions, 12,13 and (d) heteroatoms-enriched structure to improve surface wettability and contribute additional pseudocapacitance, 14,15 have been proved as suitable active materials for supercapacitors to achieve good rate capability. However, the conventional synthesis for obtaining hierarchical pore structure in PCs usually employed a template strategy that involved multistep procedures (eg, template insertion and removal).…”