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Engineering Surface Structure and Defect Chemistry of Nanoscale Cubic Co3O4 Crystallites for Enhanced Lithium and Sodium Storage
journal contribution
posted on 2020-03-27, 12:33 authored by Yanguo Liu, Haicheng Wan, Hongzhi Zhang, Jiayuan Chen, Fang Fang, Nan Jiang, Wanxing Zhang, Fangwang Zhou, Hamidreza Arandiyan, Yuan Wang, Guanyu Liu, Zhiyuan Wang, Shaohua Luo, Xiaobo Chen, Hongyu SunTransition metal
oxide nanostructures are drawing much attention
as promising electrodes for advanced rechargeable batteries. However,
due to the intrinsic low electronic conductivity and substantial volume
change during cycling, the electrodes usually show low rate capability
and poor cycling life. Herein, we report a route combining surface/interface
engineering and defect chemistry to tune the lithium storage properties
in nanoscale cubic Co3O4 crystallites. The Co3O4 crystallites were annealed in an inert atmosphere
by carefully controlling the temperature, which induces the conformal
formation of CoO layers with a tunable thickness on the surface of
initial cubes. Microstructural characterizations and electrochemical
measurements indicate that the optimized sample possesses a CoO thickness
of ∼1.1 nm and shows a reversible lithium storage capacity
of 1069.4 mAh·g–1 after 100 cycles of a current
density of 0.1 A·g–1. A capacity of 807.9 mAh·g–1 can be obtained at a rate of 5 A·g–1. The improved lithium storage performance is attributed to the unique
CoO–Co3O4 interface structure and defect
chemistry, which induces a strong electric field at the sharp Co3O4–CoO interface according to density functional
theory calculations. The optimized sample also shows it improved sodium
storage properties. This work thus provides an effective strategy
for the design and synthesis of advanced electrode materials for energy
applications.
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lithium storage capacitydensitysodium storage propertiesCo 3 O 4 crystalliteslithium storage performanceelectrodeNanoscale Cubic Co 3 O 4 Crystallitesthicknessinterfacelithium storage propertiescyclingoptimized samplemAhdefect chemistrysurfaceengineering Surface StructureSodium Storage Transition metal oxide nanostructuresCoO
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