期刊
APPLIED SURFACE SCIENCE
卷 528, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146976
关键词
Biotemplate; NiS; Supercapacitor; DFT
类别
资金
- Shandong Provincial Natural Science Foundation [ZR2018LF012]
- Foundation of State Key Laboratory of Biobased Material [ZZ20190208]
- Colleges and Universities Twenty Terms Foundation of Jinan City [2019GXRC036]
Yeast, as a natural rich-nitrogen biotemplate, holds great potential for designing of carbon microspheres (CMS) towards electrochemical devices. We rationally design and synthesize novel NiS/CMS binary hybrid microspheres by using biological yeast as carbon parental template. It is found that the introduction of bio-charcoal and the good NiS/CMS interface effect are the crucial factors for the application of electrochemical capacitors. These NiS/CMS binary hybrid microspheres show high specific capacitance of 1594 F g(-1) at 1 A g(-1), and the hybrid supercapacitor (HSC) display great energy density, power density, and improved cycling stability. Density functional theory (DFT) calculations indicate that NiS/CMS composite enhances the Ni d-orbital electronic states around the Fermi level, and meanwhile the unique electronic arrangement of d-orbital promotes synergistically the overall composite redox reaction. The concept of hybrid construction of electrode can serve as a hopeful option for developing high energy density supercapacitors.
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