This study presents the electrocatalytic generation of reactive chlorine species (RCS) with TiO2 electrocatalyst and simultaneous conversion of CO2 into formate on Bi electrode by electrodeposition method. RCS has been known as a powerful oxidizing agent, effectively mediating various (in)organic aquatic substrates. In this study, we have synthesized nanoparticulate TiO2 electrocatalysts coated onto Ir and Ta-mixed oxides (Ti/IrxTa1-xOy/TiO2; denoted as n-TEC) and used them as an anode in the oxidation of As(III) to As(V) via the RCS. For CO2 reduction reaction (CO2RR), Bi electrodes were synthesized via an electrodeposition method. The n-TEC anode showed a high Faradaic efficiency (FE) of ~100% for As(V) production at a relatively low potential via the direct charge transfer. Although FE gradually decreased with increasing potential, the addition of chloride enhanced the FE via the RCS-mediated As(III) oxidation. As for CO2RR, formate was produced at FE &gt;80%; the addition of chloride further increased the FE to ~100% owing to a chloride-catalyzed electron transfer. Based on the half-reactions, the n-TEC anode and Bi cathode was coupled and the device performance was evaluated in terms of FE of each reaction. The experimental results will be presented and discussed in detail.

Electrocatalytic generation of reactive chlorine species and simultaneous conversion of CO2 into formate

2019 Fall National Meeting

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