期刊
APPLIED SURFACE SCIENCE
卷 640, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158314
关键词
Interstitial doping; Nanoglass; First principles; Supercapacitor
S-NCO@NF electrode, which is achieved by S interstitial doping, exhibits outstanding OH-adsorption capability and electrochemical performances due to the unique atomic structure and S doping. The electrode also demonstrates high capacitance, remarkable rate capacity, and excellent cycle stability.
The nanoglasses embedded NiCo2O4 on Ni foam induced by the S interstitial doping (S-NCO@NF) is achieved in this work. Attributed to the interconnected nanostructure, the generation of nanoglasses as well as the S doping, the obtained S-NCO@NF electrode demonstrates strong OH- adsorption capability and excellent electrochemical performances. Moreover, the derivation of NiCo2O4 nanoglasses was studied by DFT calculations. The insertion of S atoms into NiCo2O4 crystal induces the dramatic relative atomic displacement and thus results in the generation of nanoglasses with many unsaturated atoms and tremendous dangling bonds. Such unique atomic structure and S doping endow the S interstitial doped models with remarkable OH- adsorption capability. Notably, the OH- adsorption calculations reveal that the doped S atoms also take part in redox reactions and perform as active sites, providing a new insight into the nonmetal doped models. The S-NCO@NF electrode demonstrates high capacitance, remarkable rate capacity and excellent cycle stability (84.44% retention after 6000 cycles). This current paper undoubtedly provides a new perspective for describing the enhancement effect of doping atoms on electrode performance.
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