期刊
CHEMICAL ENGINEERING JOURNAL
卷 384, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123367
关键词
NiCoS; Hydrothermal sulfuration; Etching; Al leaching; Supercapacitor
资金
- Graduate Research and innovation of Chongqing, China [CYB18002]
- National Natural Science Foundation of China [21576034, 51771037]
- State Education Ministry and Fundamental Research Funds for the Central Universities [2019CDQYCL042, 2018CDYJSY0055, 106112017CDJXSYY0001, 106112017CDJQJ138802, 106112017CDJSK04XK11, 2018CDQYCL0027]
- Joint Funds of the National Natural Science Foundation of China-Guangdong [U1801254]
The ordered mesoporous carbon (SBA-C) with parallel channels, synthesized using mesoporous silicon (SBA-15) as a hard template, is decorated with nanoflowers assembled by porous nickel cobalt sulfide (NiCoS) nanosheets with Al leaching through an oil bath following by a hydrothermal method. The nickel cobalt aluminum layered double hydroxide (NiCoAl LDH) precursor is successfully in-situ transformed into NiCoS nanosheets with Al leaching due to the replace of OH and CO32- ions of the NiCoAl LDH precursor by S2- and the Kirkendall effects to etch and dissolve Al hydroxide. The NiCoS@SBA-C electrode shows surprising electrochemical performance, such as an excellent specific supercapacitance of 1757 F g(-1) at a current density of 1 A g(-1), superior rate capacity of 79.68% retention at 20 A g(-1), and good cycling stability. An asymmetric supercapacitor (ASC) is assembled employing NiCoS@SBA-C as positive electrode and SBA-C as negative electrode, which delivers a high energy density of 38.8 Wh kg(-1) at a power density of 800 W kg(-1). The above results revel that incorporating ordered mesoporous carbon with transition metal sulfides is a candidate electrode material for application of energy storage devices.
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