Introduction to achievements
The rational design of the pore structure and surface heteroatom modification of carbon-based electrodes is crucial for high-performance energy storage. This article, School of Chemical Engineering Sichuan University Professor Ji Junyi’s team published a publication in the journal "Carbon" titled "N, S co-doped branched carbon nanotubes with hierarchical porous structure and electron/ion transfer pathways for supercapacitors and lithium-ion batteries" paper, research prepared polypyrrole-based N, S co-doped porous carbon nanotubes with hierarchical hollow and trunk branch nanotube structures through simple soft template polymerization and activation. The 3D interconnected structure of with uniformly distributed active sites can form a tight contact interface and interconnected channels, thereby promoting electron transfer and electrolyte penetration.
Therefore, N and S co-doped branched carbon has a large specific capacitance (420.6 F g -1 at 0.5 A g -1) and good rate performance (287.2 F g - at 30 A g -1 1) Excellent cycle stability in supercapacitor (maintaining 99.32% capacitance after 12000 cycles). In addition, this N, S co-doped branched carbon nanotube also exhibits high specific capacity (905 mAh g -1 at 0.1 A g -1) and rate performance (461 mAh g -1 at 12.8 A as LIBs anode) g-1). In addition, the full LIBs battery configured with aNSC-2.5//LiFePO 4 can achieve an energy density of 2112 Wh kg-1 anode (424 Wh kg-1 cathode). This simple, controllable, and easily scalable porous carbon fabrication strategy can be applied in many practical areas.
Picture and text introduction
Figure 1. Schematic diagram of the synthesis process of activated N, S co-doped porous carbon nanotubes
Figure 2. (a) Schematic diagram of the mechanism of CTAB regulating the branched structure of PPy nanotubes; (b) SEM image of CP; (c) CPN-0; (d) CPN-0.5; (e) CPN-1; (f) CPN-2.5; (g) CPN-5.
Figure 3. XPS (a), (b) C1s, (c) N1s and (d) S2p spectra of CPN-2.5NSC-2.5 and aNSC-2.5
Figure 4. (a) XRD pattern; (b) Raman spectrum; (c) nitrogen adsorption/desorption isotherms and (d) pore size distribution curves of CPN-2.5, NSC-2.5 and aNSC-2.5 composites.
Figure 5. Supercapacitor performance of the prepared samples
Figure 6. Electrochemical Properties of Electrodes in LIB Half-Cells
Summary
In summary, a simple but effective strategy is reported to prepare N, S co-doped porous carbon nanotubes with hierarchical hollow and backbone branched nanotube structures. This simple and easily scalable synthesis strategy of polymer-based heteroatom-doped porous hollow carbons can have practical applications in the fields of energy storage and conversion.
Instructor profile: Professor Ji Junyi, head of the
research group, is mainly engaged in research in the field of micro-nano structure design and mass transfer enhancement at the surface interface of nanocomposite electrodes. Through the design of micro-nano structures of new electrode materials, the mass transfer efficiency of the surface interface is enhanced, thereby improving the mass transfer efficiency of the surface interface. Improve energy storage and conversion efficiency. He has undertaken more than ten projects of the National Natural Science Foundation of China, Youth Fund and other various projects. His research results have been published in 451 SCI papers, with more than 3,200 positive SCI citations, 9 papers with more than 100 citations in a single article, and H factor. 22. Five SCI papers were selected as ESI TOP 1% highly cited papers. As the first author or corresponding author published 26 papers in high-level journals such as Adv. Mater. (2 articles), ACS Nano (2 articles), J. Mater. Chem. A (3 articles), etc., with an impact factor greater than 10 He has cited 1,715 times for his 7 papers, with the highest number of citations for a single paper being 758. He has successively won the Hou Debang Chemical Science and Technology Youth Award (2019), Tianjin First Prize in Natural Science (2016), Sichuan University Outstanding Scientific and Technological Talent Award (2020), Sichuan University Young Scientific and Technological Talent Award (2016), Education The Ministry of Science and Technology’s PhD Student Academic Newcomer Award (2011) and other awards.
Literature:
https://doi.org/10.1016/j.carbon.2022.07.015
