Journal
CHEMICAL ENGINEERING JOURNAL
Volume 429, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132423
Keywords
NiCo-LDH; Electrochemical activation; Areal capacity; Mass loading; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [51972234]
- International Scientific and Technological Innovation Cooperation Project between the Governments of Key National R & D Program of China [2018YFE0111500]
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Transition metal hydroxides exhibit high capacity performance at low mass loading but face challenges at high mass loading. A nickel-cobalt (oxy)hydroxide composite with hierarchical porous architecture was developed to achieve record high areal capacity and energy density at a mass loading up to 230 mg cm-2. This study provides insights into preparing high-performance electrode materials and designing high mass-loading supercapacitors.
Transition metal hydroxides have shown high capacity performances when at a small mass loading of active material, while it is still a great challenge to obtain a high capacity performance when the mass loading is high. To maximize the capacity at high mass loading, the microstructure of the electrode should be rationally designed. Herein, we report a nickel-cobalt (oxy)hydroxide composite with three-dimensional hierarchical porous architecture realized by an in-situ electrochemical activation method to trigger the active sites and structural rearrangement. By systematically tuning the pore sizes in the hierarchical structure, an optimal composite delivers a record high areal capacity (34.8 mAh cm-2) and energy density (19.1 mWh cm-2) at the mass loading up to 230 mg cm-2. It gives new insights for preparing high performance electrode materials by a facile method and provides a blueprint for the design of high mass-loading supercapacitors.
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