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Hydrolysis of Zn Ions: Controllable Synthesis of ZnₓCo₁–ₓ(OH)F Nanostructures with Their Electrochemical and Optical Properties

Wang, Shuo, Zhang, Baoqiang, Gao, Chunlan, Guo, Jingdong, Yang, De’an
Journal of physical chemistry 2019 v.123 no.14 pp. 8649-8655
absorption, adsorption, carbon fibers, desorption, electrochemistry, fluorides, hot water treatment, hydrolysis, ions, micelles, nanomaterials, optical properties, organofluorine compounds, paper, redox reactions, zinc
Recently, the synthesis and properties of metal hydroxide fluorides have attracted more attention. In this paper, a series of bimetallic hydroxyl fluorides, ZnₓCo₁–ₓ(OH)F, were grown on a functionalized carbon fiber paper via a template-/binder-free hydrothermal method, whose nanostructures can be controlled only by adjusting the addition of Zn²⁺. On the basis of a series of experiments, the mechanism of morphology evolution is proposed first, in which Zn²⁺ hydrolyzes under hydrothermal conditions to form colloidal micelles, flocculate, and adsorb with other ions. The mechanism of Zn hydrolysis has been verified in other substrates, providing a novel thinking of the design of nanostructure. What is more, the electrochemical properties of the obtained ZnₓCo₁–ₓ(OH)F have been studied, illustrating that it processes redox reactions and ion adsorption/desorption simultaneously as a quasi-pseudocapacitance material. On the other hand, the optical properties have been analyzed by the UV–visible absorption spectrum, in which the absorption peaks can be observed around 494, 526, and 628 nm in the visible light region. The above properties illustrate that the obtained ZnₓCo₁–ₓ(OH)F have potentials in various fields as a novel material, such as electrochemical, physical, or optical fields.