Hetero-metal cation control of CuO nanostructures and their high catalytic performance for CO oxidation
Hetero-metal cation control of CuO nanostructures and their high catalytic performance for CO oxidation
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CuO纳米结构的异金属阳离子控制及其对CO氧化的高催化性能
DOI：
10.1039/c2nr32729e
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Ye, Zhizhen
中科院分区：
文献类型：
--
作者：
Huang, Hongwen;Zhang, Liqiang;Ye, Zhizhen
在室温下的水溶液中，通过异金属阳离子调节，可控制合成各种形貌的 CuO 纳米结构。 CuO 的形貌可以从纳米片设计成具有不同长轴与短轴长度比的纳米颗粒。许多金属离子配合物的形成对于减缓 OH- 的释放速率起着重要作用，并进一步影响反应动力学。我们发现异质金属阳离子对 CuO 纳米结构最终形貌的影响与冷却温度相同。一系列温度控制实验证明了这一点。此外，在所有合成的 CuO 纳米结构中，令人着迷的胶体介孔 CuO 准单晶纳米片在 25 ℃ 下制备，厚度约为 100 nm。对10 nm和80.32 m(2) g(-1)的大比表面积进行了深入研究。这些CuO纳米片表现出优异的CO氧化催化活性，具有高CO转化效率（200℃时47.77 mmol(CO) g(CuO)(-1) h(-1)），接近先前研究的负载型CuO催化剂的报道，以及低表观活化能E-a（53.3 kJ mol(-1)）。
A controllable synthesis of various morphologies of CuO nanostructures with tuning by hetero-metal cations has been developed in aqueous solution at room temperature. The morphologies of CuO can be engineered from nanosheets to nanoparticles with different length ratios of the long axis to the short axis. The formation of many metal-ion complexes plays an important role in slowing the release rate of OH- and affects the reaction kinetics further. We found that the effect of hetero-metal cations on the final morphology of the CuO nanostructures was the same as that of the cooling temperature. A series of temperature-controlled experiments demonstrated this. Furthermore, among all the synthesized CuO nanostructures, the fascinating colloidal mesoporous CuO quasi-monocrystalline nanosheets prepared at 25 degrees C with a thickness of ca. 10 nm and large specific surface area of 80.32 m(2) g(-1) is investigated intensively. These CuO nanosheets demonstrate a superior catalytic activity for CO oxidation, with features of high CO conversion efficiency (47.77 mmol(CO) g(CuO)(-1) h(-1) at 200 degrees C), which is close to that reported for previously investigated supported-CuO catalysts, and a low apparent activation energy E-a (53.3 kJ mol(-1)).