期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 19, 期 2, 页码 500-507出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201203009
关键词
biosensors; electrocatalysis; L-histidine; nanostructures; nickel
资金
- National Basic Research Program of China [2010CB934700]
- National Natural Science Foundation of China [20903008, 20973019, 50725208]
As the properties of nanomaterials are strongly dependent on their size, shape and nanostructures, probing the relations between macro-properties and nanostructures is challenging for nanoscientists. Herein, we deliberately chose three types of Ni(OH)(2) with hexagonal, truncated trigonal, and trigonal hourglass-like nanostructures, respectively, as the electrode modifier to demonstrate the correlation between the nanostructures and their electrocatalytic performance towards l-histidine. It was found that the hexagonal hourglass-like Ni(OH)(2) sample had the best electrocatalytic activity, which can be understood by a cooperative mechanism: on one hand, the hexagonal sample possesses the largest specific surface area and the tidiest nanostructure, resulting in the most orderly packing on the electrode surface; on the other hand, its internal structure with the most stacking faults would generate a lot of unstable protons, leading to an enhanced electronic conductivity. The findings are important because they provide a clue for materials design and engineering to meet a specific requirement for electrocatalysis of l-histidine, possibly even for other biomolecules. In addition, the hexagonal Ni(OH)(2)-based biosensor shows excellent sensitivity and selectivity in the determination of l-histidine and offers a promising feature for the analytical application in real biological samples.
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