Robust Pseudocapacitive Na+ Intercalation Induced by Cobalt Vacancies at Atomically Thin Co1-xSe2/Graphene Heterostructure

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Dou, Yuhai
Yuan, Ding
Adekoya, David
Tian, Yuhui
Adekoya, Shanqing
Xu, Li
Zhang, Shanqing
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2021
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Abstract

Electronic structure engineering on electrode materials could bring in a new mechanism to achieve high energy and high power densities in sodium ion batteries. Herein, we design and create Co vacancies at the interface of atomically thin CoSe 2 /graphene heterostructure and obtain Co 1-x Se 2 /graphene heterostructure electrode materials that facilitate significant Na + intercalation pseudocapacitance. Density functional theory (DFT) calculation suggests that the Na + adsorption energy is dramatically increased, and the Na + diffusion barrier is remarkably reduced due to the introduction of Co vacancy. The optimized electrode delivers a superior capacity of 673.6 mAh g -1 at 0.1 C, excellent rate capability of 576.5 mAh g -1 at 2.0 C and ultra-long life up to 2000 cycles. Kinetics analysis indicates that the enhanced Na + storage is mainly attributed to the intercalation pseudocapacitance induced by Co vacancies. This work suggests that the creation of cation vacancy could bestow heterostructured electrode materials with pseudocapacitive Na + intercalation for high-capacity and high-rate energy storage.

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Angewandte Chemie - International Edition
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© 2021 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Robust Pseudocapacitive Na+ Intercalation Induced by Cobalt Vacancies at Atomically Thin Co1-xSe2/Graphene Heterostructure, Angewandte Chemie, International Edition, 2021, which has been published in final form at https://doi.org/10.1002/anie.202106857. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
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Chemical sciences
Atomically thin
Intercalation pseudocapacitance
cobalt vacancies
heterostructure
sodium-ion batteries
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Dou, Y; Yuan, D; Adekoya, D; Tian, Y; Adekoya, S; Xu, L; Zhang, S, Robust Pseudocapacitive Na+ Intercalation Induced by Cobalt Vacancies at Atomically Thin Co1-xSe2/Graphene Heterostructure, Angewandte Chemie - International Edition, 2021
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