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Yang M, Li YX, Jiang M, Li PH, Chen SH, Liu JH, Lin CH, Huang XJ, Liu WQ. Identifying Phase-Dependent Electrochemical Stripping Performance of FeOOH Nanorod: Evidence from Kinetic Simulation and Analyte-Material Interactions. Small 2020; 16:e1906830. [PMID: 31971669 DOI: 10.1002/smll.201906830] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 01/02/2020] [Indexed: 06/10/2023]
Abstract
Metal hydroxide nanomaterials are widely applied in the energy and environment fields. The electrochemical performance of such materials is strongly dependent on their crystal phases. However, as there are always multiple factors relating to the phase-dependent electrochemistry, it is still difficult to identify the determining one. The well-defined crystal phases of α- and β-FeOOH nanorods are characterized through the transmission electron microscopy by a series of rotation toward one rod, where the cross-section shape and the growth direction along the [001] crystalline are first verified for 1D FeOOH nanostructures. The electrosensitivity of the two materials toward Pb(II) is tested, where α-FeOOH performs an outstanding sensitivity whilst it is only modest for β-FeOOH. Experiments via Fourier transform infrared spectroscopy, X-ray absorption fine structure (XAFS), etc., show that α-FeOOH presents a larger Pb(II) adsorption capacity due to more surficial hydroxyl groups and weaker PbO bond strength. The reaction kinetics are simulated and the adsorption capacity is found to be the determining factor for the distinct Pb(II) sensitivities. Combining experiment with simulation, this work reveals the physical insights of the phase-dependent electrochemistry for FeOOH and provides guidelines for the functional application of metal hydroxide nanomaterials.
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Affiliation(s)
- Meng Yang
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
- Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Yi-Xiang Li
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Min Jiang
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Pei-Hua Li
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Shi-Hua Chen
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Jin-Huai Liu
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Chu-Hong Lin
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Xing-Jiu Huang
- Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China
| | - Wen-Qing Liu
- Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, P. R. China
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