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Enhanced chlorine evolution from dimensionally stable anode by heterojunction with Ti and Bi based mixed metal oxide layers prepared from nanoparticle slurry

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. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jcat.2020.04.009DOIArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2020 Published by Elsevier Inc. 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.
Funders:
Funding AgencyGrant Number
Bill and Melinda Gates FoundationOPP1149755
National Research Foundation of KoreaNRF-2018R1A4A1022194
National Research Foundation of KoreaNRF-2019R1C1C1003435
National Research Foundation of KoreaNRF-2016M3A7B4908161
Subject Keywords:heterojunction anode; reactive chlorine species; wastewater treatment; dimensionally stable anode; TiO2
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. (http://www.sciencedirect.com/science/article/pii/S002195172030138X)
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:08 Jun 2020 22:32

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