Journal
CHEMICAL ENGINEERING JOURNAL
Volume 427, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131963
Keywords
Potassium-ion battery; Metal selenides; Single-crystal architecture; Diffusion kinetic; Polyselenide convention
Categories
Funding
- National Natural Science Foundation of China [52070194, 51902347, 51908555, 51822812]
- Natural Science Foundation of Hunan Province [2020JJ5741]
- Fundamental Research Funds for the Central Uni-versities of Central South University [2021zzts0625]
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Metal selenide (CoSe2) nanorods incorporated in reduced graphene oxide nanosheet provide fast K+ transfer and effective conversion of polyselenide to selenide, showing promising potential for potassium storage and offering new insight into designing metal-ion storage materials.
Metal selenides possess tremendous potentials due to their high specific capacity for potassium storage, however the sluggish K+ diffusion and polyselenide dissolution always result in inferior electrochemical performance. Herein, metal selenide (CoSe2) nanorods with engineered exposed plane incorporated in reduced graphene oxide nanosheet (sc-CoSe2@rGO) are fabricated. In the crystalline interior, such single-crystal structure can provide unhindered path for the fast K+ transfer. Besides, at the crystalline surface, the mainly exposed (011) facet with Co2+ rich state can induce the catalytic function with enormous reaction sites, which effectively transform the polyselenide to selenide with an enhanced selenium utilization. As expected, the as-prepared sc-CoSe2@rGO delivers satisfied specific capacity, prominent rate property, and superior cyclic stability (a reversible capacity of 157.7 mAh g(-1) at high rate of 3.0 A g(-1) after 600 cycles). This single-crystalline architecture design for intrinsic K-ion diffusion and surficial optimization is pioneeringly investigated, which provides a new insight into designing and fabricating metal-ion storage materials.
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