Hierarchically porous and heteroatom self-doped graphitic biomass carbon for supercapacitors

In situ K2S activated electrospun carbon nanofibers with hierarchical meso/microporous structures for supercapacitors

“…N-6 (pyridinic N), N-5 (pyrrolic N), and N-Q (quaternary N), respectively. 13,[53][54][55][56] For carbon nanober samples obtained at 900 C, all samples exhibited three types of nitrogen with different relative amounts. Upon increasing K 2 S contents, the intensity of N-Q gradually decreases and its proportion is becoming smaller, while both N-5 and N-6 are increasing in terms of intensity and proportion.…”

“…7 One of the critical issues is the implementation of ideal electrode materials, which require a high conductivity, large ion-accessible specic surface area (SSA) and appropriate pore size distribution, [8][9][10][11][12] because the electric double-layer formation is determined by surface chemistry and apertures of pores upon carbon materials. [13][14][15][16] The electrode materials need to possess both high specic surface area and appropriate pore size distribution that combines narrow micropores suitable for ion accommodation with mesopores favorable for ion transport.…”

Fatsia Japonica-Derived Hierarchical Porous Carbon for Supercapacitors With High Energy Density and Long Cycle Life

“…The sample of pre-carbonized seeds obtained was named PCS. The mixture was then transferred to a crucible, followed by annealing and activating at the desired temperature for 12 h under an N 2 atmosphere (Zhang and Chen, 2015;Hou et al, 2019). The temperature was raised to 300 • C at a rate of 3 • C/min, then at a rate of 5 • C/min.…”

“…However, most active carbons (ACs) on improving electrochemical performance introduce heteroatoms by chemical and physical routes, which can result in high cost, environmentally destructive, and complicated manufacturing. Biomass and its derivatives, not only benefiting from renewable, low-cost, and environmentally friendly properties and but also from being rich in other elements such as nitrogen and oxygen, have been considered as prospective carbon precursors (Abioye and Ani, 2015;Lu et al, 2018;Hou et al, 2019). Many porous carbonaceous materials based on natural sources have been prepared, such as willow catkins (Wang et al, 2015), tea leaves (Song et al, 2019), corncob (Karnan et al, 2017), peanut shell (He et al, 2013), banana peels (Zhang et al, 2016), bamboo (Zequine et al, 2016), seaweed (Ye et al, 2018), biomass-based composites (Sun et al, 2017;Han et al, 2019a) etc., which show good electrochemical performance for EDCL.…”

Conversion of Biomass Wastes into Activated Carbons by Chemical Activation for Hydrogen Storage

“…In recent years, activated carbons (ACs) prepared from renewable biomass wastes have sparked tremendous interest in the energy storage device community . It possesses tremendous advantages, such as light weight, large surface area, diverse volume and pore structure, low cost and easy mass production . Basically, there are two ways to prepare active carbons: physical and chemical activation.…”