Journal
NANO ENERGY
Volume 93, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106903
Keywords
Dual-function engineering; Anode materials; Long cycling stability; In-situ transmission electron microscopy; Potassium-ion storage
Ask authors/readers for more resources
This study demonstrates the successful fabrication of N/O co-doped porous carbon spheres (PCSs) with high content of -C = O through dual-function engineering for heteroatom doping and pore constructing. The PCSs exhibit outstanding K+-storage performance, superior rate capability, and unprecedented ultralong-term cycling stability. In-situ Raman analysis reveals a reversible adsorption-intercalation hybrid K+-storage mechanism. This work opens a new avenue to construct carbonaceous electrode candidates for high-performance potassium-ion hybrid capacitors (PIHCs).
Heteroatom doping engineering is deemed to be an adoptable strategy to boost the potassium (K) storage performance of carbonaceous materials. The inevitable issue for this strategy lies in the huge volume expansion originated from the large radius of K+. In this study, N/O co-doped porous carbon spheres (PCSs) with high content -C = O are fabricated by a reliable and simple annealing route. Through dual-function engineering for heteroatom doping and pore constructing, the PCSs shows outstanding K+-storage performance with remarkable reversible capacity (389.8 mAh g(-1) at 0.1 A g(-1)), superior rate capability (201.7 mAh g(-1) at 1 A g(-1)), and unprecedented ultralong-term cycling stability (107 mA h g(-1) at 5 A g(-1) after 40,000 cycles with 0.00038% decay per cycle). In-situ Raman analysis uncovers that the PCSs undergoes a reversible adsorption-intercalation hybrid K+-storage mechanism. Specifically, density functional theory calculations and in-situ transmission electron microscopy observations elucidate the possible origins of the high reversible capacity and superb cycling stability by disentangling the synergistic effect of dual-function engineering. The PCSs can be used as the anode for potassium-ion hybrid capacitors (PIHCs) to deliver a high energy/power density. This work opens a new avenue to construct carbonaceous electrode candidates for high-performance PIHCs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available