Dual-doped carbon hollow nanospheres achieve boosted pseudocapacitive energy storage for aqueous zinc ion hybrid capacitors

Harmonizing Graphene Laminate Spacing and Zinc‐Ion Solvated Structure toward Efficient Compact Capacitive Charge Storage

“…In cooperation with the rational selection of Zn‐ion electrolyte salt, the optimal design of the densely packing 75% NHG‐rGO electrode reached an exceptional volumetric and gravimetric performance compared with most previously reported carbon‐based ZIHCs and even supercapacitors. [ 32,40,41,44–65 ] To further specify the superiority of optimized space utilization for thus‐customized graphene laminar electrode/electrolyte unit, we calculated the specific areal capacitance based on the specific area of the porous carbon, that is, C ssa . As summarized in Figure 3e, the obtained C ssa of 72 µF cm −2 outperformed all previously reported capacitors based on carbon electrodes, such as graphene, activated carbons, and other porous carbon (e.g., templated carbon and carbide‐derived carbon).…”

“…As summarized in Figure 3e, the obtained C ssa of 72 µF cm −2 outperformed all previously reported capacitors based on carbon electrodes, such as graphene, activated carbons, and other porous carbon (e.g., templated carbon and carbide‐derived carbon). [ 24,38,40,44–47,49,51–53,59,65,42,66–68 ] For instance, holy graphene framework derived through KOH activation only presented 28.9 µF cm −2 , [ 66 ] even though EG‐mediated rGO film with abundant narrow spaces just delivered 46 µF cm −2 , [ 32 ] which is further demonstrating the outstanding space utilization ratio.…”

“…Switching with ZnCl 2 significantly promoted the volumetric capacitance by maximizing the spacing utilization of [32,40,41, e) Capacitance contribution per surface area of 75% NHG/rGO film in 2 m ZnCl 2 compared with other carbon materials. [24,38,40,[44][45][46][47]49,[51][52][53]59,65,42,[66][67][68] f) Ragone plot of volumetric energy density versus power density of 75% NHG/rGO film-based ZIHC compared with other aqueous hybrid capacitors, commercial supercapacitors, and lithium-film battery. [22,59,65,66,[69][70][71][72][73][74] www.afm-journal.de www.advancedsciencenews.com…”

Synergistic effects of B/S co-doped spongy-like hierarchically porous carbon for a high performance zinc-ion hybrid capacitor

“…S5†). 34,38,39,42,46,48–50 To further investigate the synergistic effects of B and S co-doping of B 2 S 3 C for the ZIHC, the long cycling stability of all the samples was tested at 5 A g −1 for 10 000 cycles (Fig. 5(f)).…”

Recent advances and future perspectives for aqueous zinc-ion capacitors

“…It demonstrated that the doping of phosphorus improves the wettability between cathode materials and electrolyte and the doping of boron enhances electron conductivity through the transition of electronic structure and the combination of the two facilitate the enhancement of specific capacitance and performance longevity at high current densities. CHS with P/N dual doping was also demonstrated to promote the reaction kinetics and reduce the diffusion path of zinc ions and enable fast transportation of ions and electrons [39].…”