@article{Feng2026, 
author = {Zixing Feng and Siyu Jia and Ziwen Lv and Rui Tian and Qian Gao and Zhengjun Shi and Xiang Hao and Yuetong Kang and Jun Rao and Feng Peng},
title = {Xylan-derived N/S-codoped hierarchical porous carbon nanosheet for enhancing electrolyte ion transport in electric double-layer capacitor},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {4},
pages = {94908012},
keywords = {carbon nanosheets, hierarchical porous, xylan, electric double-layer capacitors, N/S-codoped},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94908012},
doi = {10.26599/NR.2025.94908012},
abstract = {Lignocellulose-based carbon nanosheet has attracted considerable attention for electric double-layer capacitors (EDLCs) applications for its large specific surface area and good chemical stability, as well as abundance and low cost in precursors. However, the high ion-transport resistance severely restricted lignocellulose-based carbon nanosheets from practical applications. Herein, we employed xylan, the second abundant natural macromolecules, as precursor and thiourea as porogen/dopant to fabricate xylan-derived N/S-codoped hierarchical porous carbon nanosheet (HPCNS) with good capacitive energy storage properties. HPCNS was facilely prepared via a molten salt method followed by a successive multi-step activation, which generated large specific surface area (1275.97 m2·g−1) and hierarchical porous structure, thereby providing abundant sites and channels for ion adsorption and transportation. The obtained HPCNS-based electrode showed a specific capacitance of 147.33 F·g−1 at 0.5 A·g−1 in 6.0 M KOH electrolyte, enabling symmetrical EDLCs deliver a long-term cycle stability of 99.85% capacity retention after 10,000 cycles. Density functional theory (DFT) calculations showed that S-doping scarcely enhanced the ion-electron interaction with electrolyte but significantly improved surface wettability and promoted pore formation, which may provide new insights on the influence of S doping on the electrochemical properties of carbon materials. This research may provide a new avenue for the high-value valorization of biomass into electrochemical energy storage devices.}
}