期刊
ENERGY STORAGE MATERIALS
卷 48, 期 -, 页码 325-334出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.03.041
关键词
-
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2021R1I1A1A01044891, KSC-2021-CRE-0060]
- Nano Material Technology Development Program of MSIP/NRF [NRF-2021R1A2C1008380]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2015M3A7B6027970, 2015M3D3A1A01064929]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2020R1C1C1012308]
- KISTI [NRF-2020R1A2C1012342]
- Korea (NRF) - Korean government (MSIT)
This study presents a novel nanoarchitecture of nitrogen and sulfur co-doped graphene nanoribbons, which exhibit high capacity and stable cycling performance as anodes for potassium-ion batteries. Theoretical calculations demonstrate that graphene nanoribbons with NS co-doping have improved potassium-ion intercalation properties compared to parallel-edged nanoribbons.
Graphitic carbon materials, particularly few-layered graphene, exhibit great potentials as potassium-ion battery (PIBs) anodes. However, bulk graphene-based ma-terials have the disordered structure owing to randomly stacked graphene layers, which causes the high migration barrier during K+ intercalation/deintercalation reactions and thus the surface-dominated capacitive response. Here, we present a novel nanoarchitecture of nitrogen and sulfur co-doped graphene nanoribbons with well-ordered stepped edges (NS-sGNR) via the electrochemical unzipping of multiwalled carbon nanotubes (MWCNTs) and the subsequent N/S co-doping process for high-performance PIB anodes. As an anode material for PIBs, the prepared sample exhibits high initial capacity (329.1 mAh g(-1) at 50 mA g(-1)), superior rate capability (211.7 mAh g(-1) at high current density, 2000 mA g(-1)), outstanding reversibility of K-staging, and stable long-term cyclability. Theoretical calculations were conducted to demonstrate that sGNRs with NS co-doping (NS-sGNR) exhibit much improved K+ intercalation properties, such as the K+ adsorption energy, charge transfer, and migration barriers, compared with the parallel-edged GNRs. Particularly, the migration barrier (the rate-determining step) can be substantially reduced at the stepped edges during K+ intercalation.
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