Facile one-pot synthesis of NiCo2O4 hollow spheres with controllable number of shells for high-performance supercapacitors
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Xiaochen Dong(
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In this work, single- and double-shelled NiCo2O4 hollow spheres have been synthesized in situ by a one-pot solvothermal method assisted by xylose, followed by heat treatment. Employed as supercapacitor electrode materials, the double-shelled NiCo2O4 hollow spheres exhibit a remarkable specific capacitance (1, 204.4 F·g-1 at a current density of 2.0 A·g-1) and excellent cycling stability (103.6% retention after 10, 000 cycles at a current density of 10 A·g-1). Such outstanding electrochemical performance can be attributed to their unique internal morphology, which provides a higher surface area with a larger number of active sites available to interact with the electrolyte. The versatility of this method was demonstrated by applying it to other binary metal oxide materials, such as ZnCo2O4, ZnMn2O4, and CoMn2O4. The present study thus illustrates a simple and general strategy for the preparation of binary transition metal oxide hollow spheres with a controllable number of shells. This approach shows great promise for the development of next-generation high-performance electrochemical materials.
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Facile one-pot synthesis of NiCo2O4 hollow spheres with controllable number of shells for high-performance supercapacitors
), Xiaochen Dong(
)
Abstract
In this work, single- and double-shelled NiCo2O4 hollow spheres have been synthesized in situ by a one-pot solvothermal method assisted by xylose, followed by heat treatment. Employed as supercapacitor electrode materials, the double-shelled NiCo2O4 hollow spheres exhibit a remarkable specific capacitance (1, 204.4 F·g-1 at a current density of 2.0 A·g-1) and excellent cycling stability (103.6% retention after 10, 000 cycles at a current density of 10 A·g-1). Such outstanding electrochemical performance can be attributed to their unique internal morphology, which provides a higher surface area with a larger number of active sites available to interact with the electrolyte. The versatility of this method was demonstrated by applying it to other binary metal oxide materials, such as ZnCo2O4, ZnMn2O4, and CoMn2O4. The present study thus illustrates a simple and general strategy for the preparation of binary transition metal oxide hollow spheres with a controllable number of shells. This approach shows great promise for the development of next-generation high-performance electrochemical materials.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China (Nos. 61525402 and 21275076), Key University Science Research Project of Jiangsu Province (No. 15KJA430006), Jiangsu Provincial Founds for Distinguished Young Scholars (No. BK20130046), Program for New Century Excellent Talents in University (No. NCET-13-0853), QingLan Project.
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