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Published September 2020 | Accepted Version + Published
Journal Article Open

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

  • 1. ROR icon California Institute of Technology

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.

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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Published - 1-s2.0-S002195172030138X-main.pdf

Accepted Version - Enhanced_chlorine_evolution_from_dimensionally_stable_anode_by_heterojunctio.pdf

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Additional details

Created:
August 22, 2023
Modified:
December 8, 2023