期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 7, 页码 6633-6643出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00790
关键词
metal-organic frameworks; layer double hydroxide; hydrolysis time; supercapacitor; energy density
资金
- National Natural Science Foundation of China [21975116]
- Major Program of Guangdong Basic and Applied Research [2019B030302009]
- Shenzhen Science and Technology Innovation Committee [JCYJ20170412154426330]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2016A030306042]
Layered double hydroxide (LDH) materials, especially metal-organic framework (MOF)-derived LDHs, have attracted much attention in electrochemical capacitor applications. However, the construction of porous three-dimensional microsphere architectures with controlled morphology is highly demanded for high-performance supercapacitor electrodes. Thus, a simple and effective strategy is recommended to design and fabricate the well-defined layered structure of LDHs with high performance. In this study, we demonstrate the synthesis of nickel-cobalt-LDHs (NiCo-LDHs) by in-situ etching of the Ni-MOF template at different hydrolysis times. Based on the different characterization results of the sample, a formation mechanism has been proposed in terms of the proton production rate and etching process. As a result of the disparity in the layered structure and the surface area, the electrochemical behavior of the NiCo-LDHs has been altered. The sample NiCo-LDH/10 (prepared after the 10 h reaction) exhibited a high surface area and the large size of LDH sheets on microspheres, which promoted the rapid electrolyte ion transportation for supercapacitors and displayed a maximum specific capacity of 1272 C g(-1) at 2 A g(-1). In addition, the assembled asymmetric supercapacitor delivered a remarkable energy density of 36.1 Wh kg(-1) with an outstanding cyclic stability (103.9% after 5000 cycles). This work establishes an effective strategy to synthesize a well-defined NiCo-LDH structure from the MOF template toward high-performance asymmetric supercapacitors, which could be extended to large-scale preparation of other transition metalbased LDHs from Ni-MOFs.
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