Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 4, Pages 2613-2621Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b04977
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Funding
- National Natural Science Foundation of China [U1532123, 61474122, 21377131, 21475133, 21277146, 61573334]
- CAS Interdisciplinary Innovation Team of the Chinese Academy of Sciences, China
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Herein, we revealed that the electrochemical behaviors on the detection of heavy metal ions (HMIs) would largely rely on the exposed facets of SnO2 nanopartides. Compared to the high-energy {221} facet, the low-energy {110} facet of SnO2 possessed better electrochemical performance. The adsorption/desorption tests, density-functional theory (DFT) calculations, and X-ray absorption fine structure (XAFS) studies showed that the lower barrier energy of surface diffusion on {110} facet was critical for the superior electrochemical property, which was favorable for the ions diffusion on the electrode, and further leading the enhanced electrochemical performance. Through the combination of experiments and theoretical calculations, a reliable interpretation of the mechanism for electroanalysis of HMIs with nanomaterials exposed by different crystal facets has been provided. Furthermore, it provides a deep insight into understanding the key factor to improve the electrochemical performance for HMIs detection, so as to design high-performance electrochemical sensors.
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