Journal
NANOSCALE
Volume 13, Issue 46, Pages 19634-19641Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr06665j
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Funding
- National Natural Science Foundation of China [21601003, 21972145, 22102169]
- Anhui Provincial Natural Foundation [2108085MB57]
- China Postdoctoral Science Foundation [BH2340000137]
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The designed edge-nitrogen doped carbon material with hierarchically porous structure achieved high potassium storage properties, attributed to the synergistic effect of edge-nitrogen induced active sites and hierarchical porous structure.
Although carbon materials have great potential for potassium ion battery (KIB) anodes due to their structural stability and abundant carbon-containing resources, the limited K+-intercalated capacity impedes their extensive applications in energy storage devices. Current research studies focus on improving the surface-induced capacitive behavior to boost the potassium storage capacity of carbon materials. Herein, we designed edge-nitrogen (pyridinic-N and pyrrolic-N) doped carbon spheres with a hierarchically porous structure to achieve high potassium storage properties. The electrochemical tests confirmed that the edge-nitrogen induced active sites were conducive for the adsorption of K+, and the hierarchical porous structure promoted the generation of stable solid electrolyte interphase (SEI) films, both of which endow the resulting materials with a high reversible capacity of 381.7 mA h g(-1) at 0.1 A g(-1) over 200 cycles and an excellent rate capability of 178.2 mA h g(-1) at 5 A g(-1). Even at 5 A g(-1), the long-term cycling stability of 5000 cycles was achieved with a reversible capacity of 190.1 mA h g(-1). This work contributes to deeply understand the role of the synergistic effect of edge-nitrogen induced active sites and the hierarchical porous structure in the potassium storage performances of carbon materials.
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