In view of the respective advantages of electrical double layer capacitance (EDLC) and pseudocapacitance, the development of electrode materials with dual energy storage mechanisms (EDLC and pseudocapacitance) will play a significant role in maximizing the overall capacitance performance. In this paper, the core-shell fibers with dense zeolite imidazole framework (ZIF) coating were synthesized on the electrospun composite nanofiber substrate by a rapid in-situ growth strategy. After pyrolysis of ZIFs(shell)@PAN/PVP(core) fibers, heteroatom-doped porous carbon fiber materials with high specific surface area (410.55 m2 g-1) were obtained. It not only had a layered porous structure, but also fully exposed the doped active sites, which made it have the advantages of EDLC and pseudocapacitance. As expected, the prepared porous carbon materials doped with rich heteroatom, as supercapacitor electrode materials, exhibited large specific capacitances of 492.7 F g−1 at a current density of 1 A g−1 and 406.4 F g−1 at 10 A g−1. After 5000 cycles of galvanostatic charge-discharge at 10 A g−1, its capacitance retention rate was as high as 98.65%, showing excellent charge storage performance and good cycle stability. Therefore, this work presents an effective strategy for the design and preparation of supercapacitor electrode materials with dual energy storage mechanisms.

Heteroatom-doped porous carbon derived from zeolite imidazole framework/polymer core-shell fibers as an electrode material for supercapacitor

Design of carbon aerogels with variable surface morphology for electromagnetic wave absorption

Self-supported VO(PO3)2 electrode for 2.8 V symmetric aqueous supercapacitors

Use of polyacrylonitrile-based carbon nanolayer modified Co3S4 to improve the overall performance of supercapacitors

Gradient architecture to boost the electrochemical capacitance of hard carbon

Supercapacitors are highly attractive in the large-scale energy storage field, but the “trade-off” between the gravimetric capacitance and the volume and area specific capacitance greatly affects their further development. In this work, we developed coralloid-like porous carbon sheets (CPCS) with double support structure via a bidirectional anchoring strategy, exhibiting ultra-low specific surface area (26.95 m2 g−1) and moderate packing density (0.75 g cm−3). In the meantime, the proposed dual-anchor structure model made the interior “self-doping” defects and the exterior “foreign-doping” defects fully exposed, which is seldom obtained by other artificial methods. Based on this, it delivered a superior overall performance in gravimetric, volumetric, and areal capacitances (308.89 F g−1, 231.67 F cm−3, and 1146 μF cm−2) and stable cyclability (10 000 cycles), which is the highest capacitance reported for polyacrylonitrile-based hard carbon without chemical/physical activation. Considering the low-energy and innovative synthesis route, our work may shed some light on developing advanced carbons promising for supercapacitors.

Design of unique porous carbons with double support structure: toward overall performance by employing bidirectional anchoring strategy

http://www.cell.com/article/S2589004222011683/pdf

iMS2Net: A multiscale networking methodology to decipher metabolic synergy of organism

Active Design of Chiral Cell Structures that Undergo Complex Deformation Under Uniaxial Loads

Airborne bacterial communities in the poultry farm and their relevance with environmental factors and antibiotic resistance genes.

In-Situ Controllable Assembly of 3d Zno-Zns Heterojunction Nanotube Arrays for Enhancing No2-Sensing Performance at Low Energy Consumption and Sensing Mechanism

Xin Zhou

Papers

Design of unique porous carbons with double support structure: toward overall performance by employing bidirectional anchoring strategy

iMS2Net: A multiscale networking methodology to decipher metabolic synergy of organism

Active Design of Chiral Cell Structures that Undergo Complex Deformation Under Uniaxial Loads

Airborne bacterial communities in the poultry farm and their relevance with environmental factors and antibiotic resistance genes.

In-Situ Controllable Assembly of 3d Zno-Zns Heterojunction Nanotube Arrays for Enhancing No2-Sensing Performance at Low Energy Consumption and Sensing Mechanism