Hong, Sukhwa and Lee, Tai-kyu and Hoffmann, Michael R. and Cho, Kangwoo (2020) Enhanced chlorine evolution from dimensionally stable anode by heterojunction with Ti and Bi based mixed metal oxide layers prepared from nanoparticle slurry. Journal of Catalysis, 389 . pp. 1-8. ISSN 0021-9517. PMCID PMC7539370. doi:10.1016/j.jcat.2020.04.009. https://resolver.caltech.edu/CaltechAUTHORS:20200424-090856301
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Abstract
This study reports enhanced current (CE_(RCS)) and energy efficiency (EE_(RCS)) of reactive chlorine species (RCS) generation on Ir₇Ta₃O_y anode by Ti/Bi mixed metal oxide heterojunction layers despite reductions in pseudo-capacitance and film conductivity. In potentiostatic electrolysis of 50 mM NaCl solutions, dramatic improvement (0.61 mmol cm⁻² hr⁻¹ at 2.5 V NHE) was noted by simple coating of thin (~2 μm) TiO₂ layer from ball-milled TiO₂ nanoparticle (80–100 nm) suspension, even with moderate elevation in voltammetric wave. Decoration of Bi₂O₃ particles (1 – 2 μm) showed limited or adverse effects for RCS generation and stability. However, Bi-doped TiO₂ layers prepared from polyol-mediated or co-precipitation methods marked the highest CE_(RCS) (~100%) and EE_(RCS) (8.16 mmol Wh⁻¹ at 2.5 V NHE) by increased mixing level and effective shift in surface charge. Surface ·OH exclusively mediated the RCS generation whose further transformation to higher oxide could be restrained by the heterojunction layer.
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Additional Information: | © 2020 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Received 22 December 2019, Revised 4 March 2020, Accepted 10 April 2020, Available online 21 April 2020. The authors would like to acknowledge the financial support of the Bill and Melinda Gates Foundation (BMGF RTTC Grant OPP1149755). This work was also supported by the Basic Research Laboratory (NRF-2018R1A4A1022194), Young Researcher Program (NRF-2019R1C1C1003435), and Nano Material Technology Development Program (NRF-2016M3A7B4908161) through the National Research Foundation of Korea. | ||||||||||
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Subject Keywords: | heterojunction anode; reactive chlorine species; wastewater treatment; dimensionally stable anode; TiO2 | ||||||||||
PubMed Central ID: | PMC7539370 | ||||||||||
DOI: | 10.1016/j.jcat.2020.04.009 | ||||||||||
Record Number: | CaltechAUTHORS:20200424-090856301 | ||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200424-090856301 | ||||||||||
Official Citation: | Sukhwa Hong, Tai-kyu Lee, Michael R. Hoffmann, Kangwoo Cho, Enhanced chlorine evolution from dimensionally stable anode by heterojunction with Ti and Bi based mixed metal oxide layers prepared from nanoparticle slurry, Journal of Catalysis, Volume 389, 2020, Pages 1-8, ISSN 0021-9517, https://doi.org/10.1016/j.jcat.2020.04.009. | ||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||
ID Code: | 102767 | ||||||||||
Collection: | CaltechAUTHORS | ||||||||||
Deposited By: | Tony Diaz | ||||||||||
Deposited On: | 24 Apr 2020 16:40 | ||||||||||
Last Modified: | 12 Feb 2022 00:51 |
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