High chlorine evolution performance of electrochemically reduced TiO2 nanotube array coated with a thin RuO2 layer by the self-synthetic method
SCIE
SCOPUS
- Title
- High chlorine evolution performance of electrochemically reduced TiO2 nanotube array coated with a thin RuO2 layer by the self-synthetic method
- Authors
- Lee, Teayoung; Lee, Woonghee; Kim, Seongsoo; Lee, Changha; Cho, Kangwoo; Kim, Choonsoo; Yoon, Jeyong
- Date Issued
- 2021-04
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- Recently, reduced TiO2 nanotube arrays via electrochemical self-doping (r-TiO2) are emerging as a good alternative to conventional dimensionally stable anodes (DSAs) due to their comparable performance and low-cost. However, compared with conventional DSAs, they suffer from poor stability, low current efficiency, and high energy consumption. Therefore, this study aims to advance the electrochemical performances in the chlorine evolution of r-TiO2 with a thin RuO2 layer coating on the nanotube structure (RuO2@r-TiO2). The RuO2 thin layer was successfully coated on the surface of r-TiO2. This was accomplished with a self-synthesized layer of ruthenium precursor originating from a spontaneous redox reaction between Ti3+ and metal ions on the r-TiO2 surface and thermal treatment. The thickness of the thin RuO2 layer was approximately 30 nm on the nanotube surface of RuO2@r-TiO2 without severe pore blocking. In chlorine production, RuO2@r-TiO2 exhibited higher current efficiency (similar to 81.0%) and lower energy consumption (similar to 3.0 W h g(-1)) than the r-TiO2 (current efficiency of similar to 64.7% of and energy consumption of similar to 5.2 W h g(-1)). In addition, the stability (ca. 22 h) was around 20-fold enhancement in RuO2@r-TiO2 compared with r-TiO2 (ca. 1.2 h). The results suggest a new route to provide a thin layer coating on r-TiO2 and to synthesize a high performance oxidant-generating anode.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107448
- DOI
- 10.1039/d0ra09623g
- ISSN
- 2046-2069
- Article Type
- Article
- Citation
- RSC ADVANCES, vol. 11, no. 20, page. 12107 - 12116, 2021-04
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