Yu Xin-Yao, Meng Qiang-Qiang, Luo Tao, Jia Yong, Sun Bai, Li Qun-Xiang, Liu Jin-Huai, Huang Xing-Jiu
Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China.
Sci Rep. 2013 Oct 7;3:2886. doi: 10.1038/srep02886.
We revealed an interesting facet-dependent electrochemical behavior toward heavy metal ions (HMIs) based on their adsorption behaviors. The (111) facet of Co3O4 nanoplates has better electrochemical sensing performance than that of the (001) facet of Co3O4 nanocubes. Adsorption measurements and density-functional theory (DFT) calculations reveals that adsorption of HMIs is responsible for the difference of electrochemical properties. Our combined experimental and theoretical studies provide a solid hint to explain the mechanism of electrochemical detection of HMIs using nanoscale metal oxides. Furthermore, this study not only suggests a promising new strategy for designing high performance electrochemical sensing interface through the selective synthesis of nanoscale materials exposed with different well-defined facets, but also provides a deep understanding for a more sensitive and selective electroanalysis at nanomaterials modified electrodes.
基于重金属离子（HMIs）的吸附行为，我们揭示了一种有趣的面依赖型电化学行为。Co3O4纳米片的（111）面比Co3O4纳米立方体的（001）面具有更好的电化学传感性能。吸附测量和密度泛函理论（DFT）计算表明，HMIs的吸附是电化学性质差异的原因。我们结合实验和理论的研究为解释使用纳米级金属氧化物电化学检测HMIs的机制提供了有力线索。此外，本研究不仅提出了一种通过选择性合成暴露不同清晰面的纳米材料来设计高性能电化学传感界面的有前景的新策略，还为在纳米材料修饰电极上进行更灵敏和选择性的电分析提供了深入理解。
