Biomass-derived mesopore-dominant hierarchical porous carbon enabling ultra-efficient lithium ion storage

Engineering All‐Purpose Amorphous Carbon Nanotubes with High N/O‐Co‐Doping Content to Bridge the Alkali‐Ion Batteries and Li Metal Batteries

“…[ 27 ] Figure 5d presents excellent cycle stability of NOPCT electrode, delivering a reversible C s of 800.6 mA h g −1 after 450 cycles at 0.5 A g −1 with an outstanding capacity retention of 99.1%. Besides that, the NOPCT also possesses excellent rate capacities (e.g., delivering a high reversible C s of 404.4 mA h g −1 at 10 A g −1 ), which are obviously superior to presently reported hard carbon materials especially under high‐power output [ 6b,28 ] (Figure 5e,f; Figure S10, Supporting Information). Upon the return of low current density, the original C s is well recovered thanks to excellent structure stability of electrode during cycling.…”

Cucurbit[6]uril‐Derived Sub‐4 nm Pores‐Dominated Hierarchical Porous Carbon for Supercapacitors: Operating Voltage Expansion and Pore Size Matching

“…In the view of pore structure, the supermesopores (d >4 nm) play a role in supplying fast ion transport channels, and the considerable supermesopore volume (0.222 cm 3 g −1 ) of CBC3 provides abundant fast ion transport channels for it, thus ensuring excellent rate capability. [2,19] The cyclability of CBC and CBCx was investigated at a high current density of 20 A g −1 . As exhibited in Figure 3h, all of CBCx deliver excellent cycling performance, of which the optimal CBC3 reaches a capacitance retention of 98.4% after 100 000 cycles at 20 A g −1 , with only 0.0016% capacity dissipation per 100 cycles.…”

“…[ 16,17 ] In the inherent cognition, micropores provide active sites to store charge, mesopores contribute channels to promote ion diffusion and transfer, and macropores act as ion buffers. [ 18,19 ] However, since the small‐sized micropores ( d <0.5 nm) are ion‐inaccessible, as well as the charge storage efficiency of small‐sized mesopores ( d <4 nm) is comparable to that of micropores, the specific capacity of carbon‐based material is not always linearly related to the micropore volume. [ 2,20–22 ] Therefore, the active site contributors should be defined as ion‐accessible micropores and small‐sized mesopores.…”

Cucurbit[6]uril‐Derived Nitrogen‐Doped Hierarchical Porous Carbon Confined in Graphene Network for Potassium‐Ion Hybrid Capacitors

“…[19,20] In principle, the ideal HDPC precursor integrates homogeneous and well-defined structures, editable frameworks, abundant heteroatoms, and low cost. [20][21][22] Cucurbit[n]uril (n = 5-8) is a kind of N, Oenriched cage-like macrocyclic organic compound that can be synthesized through the condensation reaction of glycoluril and formaldehyde (paraformaldehyde). [23][24][25] Benefiting from the unique molecular structure, it has attracted extensive interest in many fields, such as supramolecular chemistry, catalysts, and molecular machines.…”