Hydrogen-bond-mediated micelle aggregating self-assembly towards carbon nanofiber networks for high-energy and long-life zinc ion capacitors

N/O Co-doped hierarchical nanoporous biochar derived from waste polypropylene nonwoven for high-performance supercapacitors

“…The broad diffraction peaks near 25° and weak peaks near 45° were attributed to the interlayer spacing (002) and planar spacing (100) lattice planes, respectively, which indicated the presence of certain amorphous carbon and graphitized structures in the samples. 36 These weak and broad peaks indicated that all samples were composed of graphitized carbon atoms and mixed-layer stacking with a well-developed pore structure, but the carbon material exhibited a relatively poorly crystalline structure. 37 The broad peaks reflected by the (002) and (100) crystalline surfaces exhibited graphitic carbon and interlayer condensation, respectively, and no additional peaks were found in all samples; thus, the materials were completely carbonized, and no other impurities were introduced.…”

Template-Induced Ni(OH)2 Nanosheet-Constructed Hierarchically Porous Aerogel Boosts Superior Specific Capacitance and Rate Performance for Supercapacitors

“…51 In addition, when P/P 0 > 0.95, it indicates that there are macropores in aerogel materials. 52 The pore size distribution calculated via Barrett's equation (BJH) demonstrates that HP-NiAs-3 possesses both micropores of 1.27 nm and mesopores of 2.95, 4.32, and 8.63 nm. The mesopore sizes of HP-NiAs-1 (2.0 and 2.95 nm) and HP-NiAs-2 (2.95 and 4.32 nm) are different, while the micropore sizes increase to 1.59 nm (HP-NiAs-1) and 1.48 nm (HP-NiAs-2), respectively.…”

“…At P / P 0 = 0.45, the adsorption/desorption hysteresis loops appear, indicating the presence of multimolecular layer adsorption and implying that the material contains mesopores . In addition, when P / P 0 > 0.95, it indicates that there are macropores in aerogel materials . The pore size distribution calculated via Barrett’s equation (BJH) demonstrates that HP-NiAs-3 possesses both micropores of 1.27 nm and mesopores of 2.95, 4.32, and 8.63 nm.…”

All-Round Enhancement in Zn-Ion Storage Enabled by Solvent-Guided Lewis Acid–Base Self-Assembly of Heterodiatomic Carbon Nanotubes

“…Aqueous Zn-metal batteries show promising application prospects because of the distinct advantages of Zn anodes such as a high theoretical capacity (820 mA h g –1 ), low redox potential of Zn 2+ /Zn (−0.76 V), natural abundance, and operation safety. − Nevertheless, the inevitable dissolution of transition-metal cathodes in electrolytes and parasitic reactions hinder the real implementation of Zn batteries, generally triggering irreversible capacity reduction and limited life span. − Supercapacitors harnessing a rapid charge adsorption/desorption mechanism show significant merits of high-power output and cyclability but suffer from limited energy density. − The coupling of battery-type Zn anodes and capacitive supercapacitor cathodes can integrate into Zn-ion hybrid capacitors (ZHCs). − The stripping/depositing of Zn anode gives battery-scale energy supply, while the fast ion sorption of capacitive cathodes promise supercapacitor-level power output and cycle stability. − Thus, ZHCs exert the respective advantages of batteries and supercapacitors, which deliver the potential to synergistically supply high-energy power densities and long-term cycle stability. The remaining task is to exploit capacitive cathode materials with fast ion-migration kinetics to enable large current tolerance and cycle durability and joint Faradaic/non-Faradaic electrochemistry response to match the high-capacity Zn anode to realize high-energy supply.…”