Volume 7, Issue 6 1900018
Full Paper

Facile Synthesis of Binary Transition Metal Sulfide Tubes Derived from NiCo-MOF-74 for High-Performance Supercapacitors

Jianhua Yu

Corresponding Author

Jianhua Yu

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Xiaolei Gao

Xiaolei Gao

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Zhenxing Cui

Zhenxing Cui

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Yu Jiao

Yu Jiao

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Qian Zhang

Qian Zhang

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Hongzhou Dong

Hongzhou Dong

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Liyan Yu

Corresponding Author

Liyan Yu

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

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Lifeng Dong

Corresponding Author

Lifeng Dong

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 P. R. China

Department of Physics, Hamline University, St. Paul, 55104 USA

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First published: 31 January 2019
Citations: 85

Abstract

Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal-organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo-O) tubular structures are derived from NiCo-MOF-74 via a facile annealing process, and then phosphate (NiCo-P) and sulfide (NiCo-S) structures are obtained from NiCo-O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo-S with nanosheet structures has the highest specific capacitance of 930.4 F g−1 at a current density of 1 A g−1 and an excellent rate capability with a retention of ≈80% at 10 A g−1. The long-term cycling performance of NiCo-S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo-S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg−1 at a power density of 800 W kg−1. The excellent performance of NiCo-S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.

Conflict of Interest

The authors declare no conflict of interest.

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