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A Study on the Catalytic Activity and Service Lifetime of RuO 2 ‐TiO 2 Composite Electrode with TNTs as Interlayer
Author(s) -
Cao Huazhen,
Zhao Guojun,
Hou Guangya,
Tang Yiping,
Zhang Huibin,
Zheng Guoqu
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902750
Subject(s) - materials science , anatase , calcination , amorphous solid , electrocatalyst , chemical engineering , electrode , composite number , electrolyte , anodizing , coating , substrate (aquarium) , catalysis , thermal stability , nanotechnology , electrochemistry , composite material , chemistry , photocatalysis , aluminium , crystallography , geology , biochemistry , oceanography , engineering
Herein, we reported a novel RuO 2 ‐TiO 2 composite electrode prepared by thermal decomposition process using TiO 2 nanotube arrays (TNTs) as an interlayer. Specifically, the TNTs interlayer was fabricated by anodic oxidation on pure Ti plate, followed by heat‐treatment (450 °C) to transform its amorphous structure to anatase structure. This TNTs interlayer not only has a good protection for Ti substrate, but also has a low resistance. The resultant RuO 2 ‐TiO 2 electrode presents superior performance toward chlorine evolution reaction (ClER) and longer service lifetime (132 h) than that without interlayer (59 h). Experimental results show that anodizing time determines the length of TiO 2 nanotubes and brings about different catalytic activity and stability. The RuO 2 ‐TiO 2 /TNTs/Ti electrode with an optimal RuO 2 ‐TiO 2 coating (4.5 g m −2 ) presents a better spatial structure, homogeneous crystal particles, uniformly distribution and more active sites. However, high calcination temperature (>600 °C) has a detrimental impact, i. e. the collapse of TNTs and a “cracked mud” structure, which provide a path for oxygen and electrolyte to penetrate into the substrate and cause the spalling of coating, eventually lead to a serious decline in electrocatalytic activity and stability.