Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Seawater electrolysis is promising as an in situ H2 production method, allowing immediate overseas transport of the produced H2. Typically, it proceeds under alkaline conditions to ensure the selectivity of the oxygen evolution reaction (OER) over the chloride oxidation reaction (ClOR). In addition, electrolyzers usually require membranes to inhibit the chlorine reduction reaction (ClRR) and maximize the hydrogen evolution reaction (HER) while separating H2 from O2. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H2. For selective ClOR and HER, ternary Pt, Ru, and Ti oxide (PRT) anodes and MnOx cathodes were synthesized, respectively. An optimized PRT electrocatalyst with a minimized Pt level (Pt0.06Ru0.24Ti0.7Ox) drove ClOR at an FE of ~100% in saline water at an industrial level of J (0.8 A cm-2) over 500 h. Furthermore, ClRR was effectively inhibited by the MnOx cathode, leading to ~100% FE in the H2 production. Finally, the PRT anode and MnOx cathode pair produced aqueous free chlorine and H2 gas with FEs of ~100% over 100 h in a single-compartment cell containing seawater at pH 8.2. Moreover, the OER and ClRR are completely inhibited during seawater electrolysis.
This research was supported by the National Research Foundation of Korea (2018R1A6A1A03024962, 2019R1A2C2002602, and 2021K1A4A7A02102598).
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