N,Se co-doping strategy to boost the K+ storage performance of metal organic framework-derived 3D amorphous carbon

Abstract

In view of cost-effectiveness, tunable interlayer spacing, and high electrical conductivity, carbonaceous materials are regarded as the most promising anodes for potassium-ion energy storage devices. Conversely, the poor diffusion kinetics, substantial volume changes caused by large-sized potassium ions (K+), and insufficient active sites limit the rate capability and cycling stability. Herein, a N,Se co-doped porous carbon octahedron (NSeC) material has been successfully synthesized by integrating microstructural engineering and surface-modification strategies, using UiO-66-NH2 (a Zr-based MOF) as the precursor. The resultant NSeC featured a high content of edge N (pyrrolic N and pyridinic N) and abundant micropores, which ensured plentiful active sites and defects for K+ storage, thereby enhancing the diffusion kinetics of K+ and providing additional capacitive storage capacity. Accordingly, the NSeC anode displayed a high reversible capacity (228.8 mAh g−1 at 0.5 A g−1 after 1000 cycles), long cycling stability (195.6 mAh g−1 at 2.0 A g−1 over 3300 cycles) and excellent rate performance (158.4 mAh g−1 at 10 A g−1), which are superior to those of C and NC anodes. CV, charge/discharge curves and in situ Raman measurements were performed to reveal the high structural stability of the NSeC and its adsorption–intercalation mechanism for K+ storage. Moreover, the assembly of a full cell confirmed its potential for practical applications. This work could provide us with a greener, lower energy-consuming and more facile method for developing high-performance carbon-material anodes applicable to potassium-ion batteries.

Graphical abstract: N,Se co-doping strategy to boost the K+ storage performance of metal organic framework-derived 3D amorphous carbon

Supplementary files

Article information

Article type
Paper
Submitted
29 Mar 2025
Accepted
25 Jul 2025
First published
25 Jul 2025

Green Chem., 2025, Advance Article

N,Se co-doping strategy to boost the K+ storage performance of metal organic framework-derived 3D amorphous carbon

Y. Wang, L. Cai, S. Yuan, L. Feng, Z. Guo and S. Dong, Green Chem., 2025, Advance Article , DOI: 10.1039/D5GC01554E

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