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[摘要]：Cu incorporated Co(3)O(4) (Cu(x)Co(3-x)O(4), 0 <= x <= 1) nanoparticles were prepared using a thermal decomposition method. Properties of the Cu(x)Co(3-x)O(4), such as morphology, particle sizes, crystallite structure and cation distribution, were characterized with SEM, TEM, XRD and EDX. The Cu(x)Co(3-x)O(4) particles, with various x values, were found to be cubic spinel nanoparticles, with average size of 20-30 nm. Incorporation of Cu in the spinel lattice of Co(3)O(4) shifted the Co(3+)/Co(4+) redox peak as well as the onset point for OER to more negative potentials, which may be related to inversion of Cu(2+) into the octahedral sites. Amongst all samples studied, Cu(0.7)Co(2.3)O(4) was the most active for OER. The Cu(x)Co(3-x)O(4) electrodes exhibited satisfying stability during repetitive cyclic voltammetry. A membrane electrode assembly, using 3 mg cm(-2) Cu(0.7)Co(2.3)O(4) on the anode, demonstrated, in an alkaline membrane water electrolyser, a high current density performance of 1 A cm(-2) at a voltage of 1.8 V in 1 mol dm(-3) KOH at 25 degrees C. |
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