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We synthesized hollow AuCu bimetallic nanostructures using a Cu 2 O template and evaluated their hydrogen dissociation performance. The formation of a superstructural bimetallic and well-inherited shape was confirmed using transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The AuCu bimetallic nanostructures were tested for the catalytic reduction of o-nitroaniline to 1,2-benzenediamine, and they showed much better catalytic activity than pure Au. The hollow AuCu cubic structure exhibited superior catalytic efficiency (reaction rate constant = 0.33 min −1 ) compared with other structures such as a cuboctahedral structure (0.08 min −1 ), an octahedral structure (0.17 min −1 ), and pure Au (0.06 min −1 ). Furthermore, we examined the dependence of o-nitroaniline reduction activity of the hollow AuCu hybrids on NaBH 4 concentration. The reaction rate constant became saturated at a lower NaBH 4 concentration for Au nanoparticles, while its saturation occurred at a higher NaBH 4 concentration in the case of hollow AuCu nanostructures. |
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