Wang Jingyi, Zeng Hongbo
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Adv Colloid Interface Sci. 2021 Feb;288:102346. doi: 10.1016/j.cis.2020.102346. Epub 2020 Dec 17.
Electrochemical techniques are very useful tools for characterizing the surface properties of natural minerals involved in electrochemical reactions. This work reviews the recent advances in electrochemical characterizations of minerals by employing various electrochemical techniques, i.e., open circuit potential, chronoamperometry, potential sweep voltammetry, electrochemical impedance spectroscopy, and electrochemical scanning probe techniques. The fundamental working principles of these electrochemical techniques and their applications for mineral surface characterizations in various research areas, including mineral flotation, mineral leaching, electrocatalysis, energy storage materials and environmental issues, are highlighted. Valuable information such as the redox condition of substrate surface, the current response of substrate with time under polarization, the identification of redox reaction and its kinetics on substrate surface, the structure of substrate/electrolyte interface, and the local electrochemical response on substrate surface at micro-/nano-scale can be obtained by open circuit potential, chronoamperometry, potential sweep voltammetry, electrochemical impedance spectroscopy, and scanning electrochemical microscopy, respectively. Some remaining challenges and future perspectives are discussed. These recent advances in electrochemical techniques can be readily applied to characterize the surface properties and interfacial interactions of a wide variety of material systems and in different engineering processes.
电化学技术是表征参与电化学反应的天然矿物表面性质的非常有用的工具。本文综述了采用各种电化学技术，即开路电位、计时电流法、电位扫描伏安法、电化学阻抗谱和电化学扫描探针技术，在矿物电化学表征方面的最新进展。重点介绍了这些电化学技术的基本工作原理及其在矿物浮选、矿物浸出、电催化、储能材料和环境问题等各个研究领域中用于矿物表面表征的应用。通过开路电位、计时电流法、电位扫描伏安法、电化学阻抗谱和扫描电化学显微镜，分别可以获得诸如基底表面的氧化还原条件、极化下基底随时间的电流响应、基底表面氧化还原反应的识别及其动力学、基底/电解质界面的结构以及微/纳米尺度下基底表面的局部电化学响应等有价值的信息。讨论了一些尚存的挑战和未来展望。电化学技术的这些最新进展可很容易地应用于表征各种材料体系的表面性质和界面相互作用以及不同的工程过程。
