Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7736433 | Journal of Power Sources | 2014 | 7 Pages |
Abstract
A fast microwave-assisted synthesis method followed by a post-calcining process is used to prepare three-dimensional (3D) nanosphere-like NiCo2O4 nanostructure. The 3D NiCo2O4 nanospheres are constructed by intertwined two-dimensional (2D) ultrathin mesoporous nanosheets. The nanosphere-like NiCo2O4 has a large specific surface area (SSA, 146.5Â m2Â gâ1) and is successfully applied to electro-catalytic oxidation of methanol. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and chronoamperometry (CA) measurements are used to investigate electro-catalytic performance of the as-prepared NiCo2O4. The current density of NiCo2O4/Ni foam (NiCo2O4/NF) electrode in 1Â M KOH with 0.5Â M methanol is up to 40.9Â AÂ gâ1. And the current density can be returned to 97% of the original value by replacing new 1Â M KOH electrolyte with 0.5Â M methanol after a long-term CV cycle (500 cycles). These results show that our prepared NiCo2O4 possesses high electro-catalytic activity and good long-term stability for methanol oxidation. This may be benefit from the unique porous nanosphere-like structure and large SSA.
Related Topics
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Authors
Li Gu, Lei Qian, Ying Lei, Yanyan Wang, Jing Li, Hongyan Yuan, Dan Xiao,