Optimizing RuOx−TiO2 composite anodes for enhanced durability in electrochemical water treatments

doi:10.1016/j.chemosphere.2020.129166

機構典藏 > College of Engineering > Graduate Institute & Department of Water Resources and Environmental Engineering > Journal Article > Item 987654321/119701

Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/119701

Title:	Optimizing RuOx−TiO2 composite anodes for enhanced durability in electrochemical water treatments
Authors:	Park, Hyeona;Mameda, Naresh;Li, Chi-Wang;Jeong, Hye Won;Park, Hyunwoong;Choo, Kwang-Ho
Keywords:	RuO2−TiO2 composite;Electrode durability;Service life;Calcination;Deactivation
Date:	2021-02
Issue Date:	2020-12-09 12:10:13 (UTC+8)
Abstract:	Metal oxide anode electrocatalysts are important for an effective removal of contaminants and the enhancement of electrode durability in the electrochemical oxidation process. Herein, we report the enhanced lifetime of RuOx−TiO2 composite anodes that was achieved by optimizing the fabrication conditions (e.g., the Ru mole fraction, total metal content, and calcination time). The electrode durability was assessed through accelerated service lifetime tests conducted under harsh environmental conditions, by using 3.4% NaCl and 1.0 A/cm2. The electrochemical characteristics of the anodes prepared with metal oxides having different compositions were evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray analyses. We noticed that, the larger the Ru mole fraction, the more durable were the electrodes. The RuOx−TiO2 electrodes were found to be highly stable when the Ru mole fraction was >0.7. The 0.8RuOx−0.2TiO2 electrode was selected as the one with the most appropriate composition, considering both its stability and contaminant treatability. The electrodes that underwent a 7-h calcination (between 1–10 h) showed the longest lifetime under the tested conditions, because of the formation of a stable Ru oxide structure (i.e., RuO3) and a lower resistance to charge transfer. The electrode deactivation mechanism that occurred due to the dissolution of active catalysts over time was evidenced by an impedance analysis of the electrode itself and surface elemental mapping.
Relation:	Chemosphere 265, 129166
DOI:	10.1016/j.chemosphere.2020.129166
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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