期刊
CHEMICAL ENGINEERING JOURNAL
卷 335, 期 -, 页码 416-433出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.169
关键词
Mixed hydroxides; NiCo-MnO2; Carbonized iron cations (C-FP); Electrochemical performance; Supercapattery; Energy density
资金
- South African Research Chairs Initiative of the Department of Science and Technology
- National Research Foundation of South Africa [61056]
- University of Pretoria
- National Research Foundation (NRF)
NiCo /NiCoMn-mixed hydroxides and ternary NiCo-MnO2 electrode materials were successfully synthesised by a force-driven hydrolysis of hydrated nickel, cobalt and manganese nitrate salts at 40 degrees C for 2 h with an additional annealing step adopted in producing the NiCo-MnO2 sample. The morphological, structural, compositional and textural characterization of the samples were obtained using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and N2 physisorption respectively. The initial sample characterization confirmed bigger material agglomeration of the as-prepared mixed hydroxides compared to the NiCo-MnO2 sample which had small stacked sheet-like and porous morphology. Further sample analysis also confirmed a high degree of crystallinity in both the mixed hydroxides and NiCo-MnO2 samples with the elemental constituents existing in different oxidation states. One of the mixed hydroxides sample namely, NiCo(OH)(2) exhibited a specific surface area (SSA) of approximately 3.40m(2) g(-1) as compared to the ternary NiCo-MnO2 material which exhibited a higher SSA of 153.94m(2) g(-1). The ternary NiCo-MnO2 electrode exhibited the highest specific capacity of 132.1 mAh g(-1), compared to NiCo(OH)(2) and NiCoMn-triple hydroxide (NiCoMn-TH) electrodes which exhibited a specific ca-
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