Journal
CHEMISTRYSELECT
Volume 4, Issue 18, Pages 5258-5263Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201900683
Keywords
Bimetallic Ni-Co silicate; supercapacitor; controllable morphology; hydrothermal synthesis
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Funding
- National Natural Science Foundation of China [21775083]
- Research Foundation for Distinguished Scholars of Qingdao Agricultural University [663-1117018]
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A facile and one-step synthetic method is developed to produce the layered bimetallic Ni-Co silicate with the controllable morphology and porous microstructure by using the silica as the sacrifice template at the moderate reaction conditions. The bimetallic Ni-Co silicate core-shell and hollow spheres were obtained under 140 degrees C for 6h and 12h, respectively. The pore size and the content of metal ions of the bimetallic Ni-Co silicate could be affected by the different structure. The final product shows good dispersivity, which is benefit to the homogeneity as an active material in the electrode. The as-prepared Ni-Co silicate hollow spheres exhibit good electrochemical performance with high specific capacitance and rate capability, good charge-discharge stability and long cycle life. The capacitance retention of the hollow structure can reach 58.69% at the current density of 10A/g and 86.38% after 5000 cycle. The good electrochemical performance can be attributed to the different size of the pores and layer architecture. Bimetallic Ni-Co silicate hollow spheres show better electrochemical properties than the monometallic Ni or Co, which attribute to the synergistic effect.
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