Membraneless unbuffered seawater electrolysis for pure hydrogen production using PtRuTiOx anode and MnOx cathode pairs

초록

Seawater electrolysis is promising as an in situ H-2 production method, allowing immediate overseas transport of the produced H-2. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H-2. A ternary Pt, Ru, and Ti (PRT) catalyst with a minimized Pt level (Pt0.06Ru0.24Ti0.7Ox) drives chloride oxidation reaction (ClOR) at a Faradaic efficiency (FE) of similar to 100% in saline water at current density (J) of 800 mA cm(-2) over 500 h. Chlorine reduction reaction (ClRR) is also inhibited on MnOx electrodes, leading to hydrogen evolution reaction (HER) at an FE of similar to 100% even in the presence of chlorine species (HClO/ClO-). Finally, the PRT anode/MnOx cathode pair is demonstrated to drives ClOR and HER at FEs of similar to 100% at J = 80 mA cm(-2) over 100 h in a single-compartment cell containing seawater. Oxygen evolution reaction and ClRR are completely inhibited during seawater electrolysis.

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