期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 4, 页码 5988-6001出版社
WILEY
DOI: 10.1002/er.6218
关键词
carbon‐ shell wall; hybrid supercapacitor; metal‐ organic framework; oxysulfide; ZIF‐ 67
资金
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [2014R1A5A1009799]
- Dongguk University [S-2020-G0001-00057]
- project Development of eco-friendly process for value-up of low usage chemical resources [KK2011-00]
- KRICT
The construction of hybrid supercapacitors using defect-engineered electrodes from single metal-organic frameworks showed unique structural features and rich electrochemical properties. The CoOS-C-based electrode exhibited high storage capacity, excellent rate capability, and long-term cyclic stability, thanks to its tunable defect functionality.
Construction of hybrid supercapacitors (HSCs) with defect engineered electrodes derived from single metal-organic frameworks (zeolitic imidazolate frameworks, ZIF-67) via control of the thermal influences showed unique structural features and rich electrochemical properties. Designing the three-dimensional Co oxysulfide nanograins with carbon frame (CoOS-C)-based positive electrode surfaces through sulfidation with tunable defect states along with N- and S-doping states improved the electrical energy storage; further, the possibility of having a carbon-based skeleton surface influenced the effective rate capability during the charge-discharge process. This unique nanostructural feature with encapsulation of porous N- and S-doped graphitic carbon enabled improved rate performance by enhancing the stability of the electrode material and shortening the ion-diffusion paths by the synergistic effect. Owing to the tunable defect functionality, the CoOS-C based electrode exhibited a high storage capacity of 708.8 C g(-1) at 1 A g(-1) and an excellent rate capability with long-term cyclic stability, with more than 93% capacity retention after 3000 cycles. Furthermore, the fabricated HSCs operated within a wide potential window of 1 to 1.6 V, which allowed excellent rate capability with a high-energy density of 31.7 W h kg(-1) at a specific power density of 800 W kg(-1) with long-term cyclic stability up to 10 000 cycles.
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