Synthesis of amorphous hydroxyl-rich Co3O4 for flexible high-rate supercapacitor
[Display omitted] •Novel Co3O4 flexible electrode is fabricated via electrochemical oxidation of Co-MOF.•This Co3O4 electrode owns the amorphous hydroxyl-rich hierarchical structure.•It expresses higher Cs than a highly crystalline hydroxyl-deficient Co3O4 electrode.•It also exhibits better rate per...
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| Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 396; p. 125364 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
15.09.2020
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| Subjects | |
| Online Access | Get full text |
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| Abstract | [Display omitted]
•Novel Co3O4 flexible electrode is fabricated via electrochemical oxidation of Co-MOF.•This Co3O4 electrode owns the amorphous hydroxyl-rich hierarchical structure.•It expresses higher Cs than a highly crystalline hydroxyl-deficient Co3O4 electrode.•It also exhibits better rate performance than many cobalt oxide-based electrodes.•ASC based on this electrode shows excellent rate capability and cycling performance.
Metal oxides-based materials are promising electrodes for energy storage devices, however, the low rate performance and the high energy consumption in the preparation limit their practical applications. Herein, a novel amorphous hydroxyl-rich Co3O4 hierarchical structure flexible electrode is facilely fabricated via electrochemical oxidation of a cobalt-based metal-organic framework. The as-prepared Co3O4 hierarchical structure is composed of large microrods and small nanoparticles and possesses abundant mesopores, amorphous, and hydroxyl-rich nature. These characteristics favor rapid electron transfer, complete exposure of the active interface, and sufficient penetration of electrolyte ions within the active material. Benefitting from these advantages, the optimal Co3O4 electrode (Co3O4-5) expresses a high reversible specific capacitance (Cs) of 226.1 C·g−1 (or 253.2 mC·cm−2), which is 2 (or 3.7) times higher than those of highly crystalline hydroxyl-deficient Co3O4 electrode. The Co3O4-5 electrode also shows excellent rate performance (97% Cs retention after a 6.7-times current increasing), which surpasses the levels of many cobalt oxide-based electrodes. In addition, an asymmetric supercapacitor (ASC) constructed from this Co3O4-5 electrode achieves a large energy density of 26.6 Wh·kg−1 (or 0.146 mWh·cm−2), outstanding rate capability (1% Cs loss at the 10-fold higher current density), and stable cycle performance (10.1% Cs loss after 20,000 charge-discharge cycles). |
|---|---|
| AbstractList | [Display omitted]
•Novel Co3O4 flexible electrode is fabricated via electrochemical oxidation of Co-MOF.•This Co3O4 electrode owns the amorphous hydroxyl-rich hierarchical structure.•It expresses higher Cs than a highly crystalline hydroxyl-deficient Co3O4 electrode.•It also exhibits better rate performance than many cobalt oxide-based electrodes.•ASC based on this electrode shows excellent rate capability and cycling performance.
Metal oxides-based materials are promising electrodes for energy storage devices, however, the low rate performance and the high energy consumption in the preparation limit their practical applications. Herein, a novel amorphous hydroxyl-rich Co3O4 hierarchical structure flexible electrode is facilely fabricated via electrochemical oxidation of a cobalt-based metal-organic framework. The as-prepared Co3O4 hierarchical structure is composed of large microrods and small nanoparticles and possesses abundant mesopores, amorphous, and hydroxyl-rich nature. These characteristics favor rapid electron transfer, complete exposure of the active interface, and sufficient penetration of electrolyte ions within the active material. Benefitting from these advantages, the optimal Co3O4 electrode (Co3O4-5) expresses a high reversible specific capacitance (Cs) of 226.1 C·g−1 (or 253.2 mC·cm−2), which is 2 (or 3.7) times higher than those of highly crystalline hydroxyl-deficient Co3O4 electrode. The Co3O4-5 electrode also shows excellent rate performance (97% Cs retention after a 6.7-times current increasing), which surpasses the levels of many cobalt oxide-based electrodes. In addition, an asymmetric supercapacitor (ASC) constructed from this Co3O4-5 electrode achieves a large energy density of 26.6 Wh·kg−1 (or 0.146 mWh·cm−2), outstanding rate capability (1% Cs loss at the 10-fold higher current density), and stable cycle performance (10.1% Cs loss after 20,000 charge-discharge cycles). |
| ArticleNumber | 125364 |
| Author | Guan, Cao Wu, Yatao Chen, Weijie Shen, Zhehong Tong, Yifei Chen, Hao Wang, Jiajie Pei, Gu Tao, Yingjie |
| Author_xml | – sequence: 1 givenname: Yingjie surname: Tao fullname: Tao, Yingjie organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 2 givenname: Yatao surname: Wu fullname: Wu, Yatao organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 3 givenname: Hao surname: Chen fullname: Chen, Hao email: haochen@zafu.edu.cn organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 4 givenname: Weijie surname: Chen fullname: Chen, Weijie organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 5 givenname: Jiajie surname: Wang fullname: Wang, Jiajie organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 6 givenname: Yifei surname: Tong fullname: Tong, Yifei organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 7 givenname: Gu surname: Pei fullname: Pei, Gu organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 8 givenname: Zhehong surname: Shen fullname: Shen, Zhehong email: zhehongshen@zafu.edu.cn organization: School of Engineering, Zhejiang A&F University, Hangzhou 311300, PR China – sequence: 9 givenname: Cao surname: Guan fullname: Guan, Cao email: iamcguan@nwpu.edu.cn organization: Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, PR China |
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•Novel Co3O4 flexible electrode is fabricated via electrochemical oxidation of Co-MOF.•This Co3O4 electrode owns the amorphous hydroxyl-rich... |
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| SubjectTerms | Co3O4 Electrochemical oxidation Flexible electrode Hydroxyl-rich Supercapacitor |
| Title | Synthesis of amorphous hydroxyl-rich Co3O4 for flexible high-rate supercapacitor |
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