期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 584, 期 -, 页码 875-884出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.10.019
关键词
MoP; N, P-codoped; Hollow carbon nanotubes; Potassium-ion batteries
资金
- National Natural Science Foundation of China [51671136]
- International Technological Collaboration Project of Shanghai [17520710300]
This study developed a promising electrode based on N, P codoped large diameter hollow carbon nanotubes decorated with ultrasmall MoP nanoparticles, which exhibited long-term cycling stability at high current density, offering a new pathway for developing high reversible capacity and promising electrode materials for KIBs.
Potassium-ion batteries (KIBs) as a substitute for lithium ion batteries have attracted tremendous attention in recent years thanks to the cost-effectiveness and abundance of potassium resources. However, the current lack of suitable electrode materials is a major obstacle against the practical application of KIBs. Hence, design and preparation of capable anode materials are critical for the development of KIBs. In this study, a promising electrode based on N, P-codoped large diameter hollow carbon nanotubes decorated with ultrasmall MoP nanoparticles (MoP@NP-HCNTs) were prepared. The hollow carbon nanotubes facilitate the rapid electron and ion transfer, and release the huge volume expansion during discharge/charge. The MoP@NP-HCNT electrode delivers high initial capacity of 485, 482 and 463 mAh g(-1) corresponding to 100, 200 and 1000 mA g(-1), respectively. The discharge specific capacity still maintains 300 mAh g(-1) at 100 mA g(-1) after over 80 cycles. It still shows ultralong cycling stability with a discharge capacity of 255 mAh g(-1) at a high current density of 1000 mA g(-1) after 120 cycles. This study opens up a new routine to develop high reversible capacity and promising electrode materials for KIBs. (C) 2020 Elsevier Inc. All rights reserved.
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