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

Nan Nan Liang; Dong Suk Han; Hyunwoong Park

doi:10.1016/j.apcatb.2022.122275

Membraneless unbuffered seawater electrolysis for pure hydrogen production using PtRuTiO_x anode and MnO_x cathode pairs

Nan Nan Liang, Dong Suk Han, Hyunwoong Park

School of Energy Engineering

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Seawater electrolysis is promising as an in situ H₂ production method, allowing immediate overseas transport of the produced H₂. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H₂. A ternary Pt, Ru, and Ti (PRT) catalyst with a minimized Pt level (Pt_0.06Ru_0.24Ti_0.7O_x) drives chloride oxidation reaction (ClOR) at a Faradaic efficiency (FE) of ∼100% in saline water at current density (J) of 800 mA cm⁻² over 500 h. Chlorine reduction reaction (ClRR) is also inhibited on MnO_x electrodes, leading to hydrogen evolution reaction (HER) at an FE of ∼100% even in the presence of chlorine species (HClO/ClO⁻). Finally, the PRT anode/MnO_x cathode pair is demonstrated to drives ClOR and HER at FEs of ∼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.

Original language	English
Article number	122275
Journal	Applied Catalysis B: Environmental
Volume	324
DOIs	https://doi.org/10.1016/j.apcatb.2022.122275
State	Published - 5 May 2023

Keywords

Chloride oxidation reaction
Electrocatalyst
Hydrogen production reaction
Oxygen evolution reaction
Selectivity

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apcatb.2022.122275

Cite this

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title = "Membraneless unbuffered seawater electrolysis for pure hydrogen production using PtRuTiOx anode and MnOx cathode pairs",

abstract = "Seawater electrolysis is promising as an in situ H2 production method, allowing immediate overseas transport of the produced H2. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H2. 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 ∼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 ∼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 ∼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.",

keywords = "Chloride oxidation reaction, Electrocatalyst, Hydrogen production reaction, Oxygen evolution reaction, Selectivity",

author = "Liang, {Nan Nan} and Han, {Dong Suk} and Hyunwoong Park",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2023",

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AU - Han, Dong Suk

AU - Park, Hyunwoong

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N2 - Seawater electrolysis is promising as an in situ H2 production method, allowing immediate overseas transport of the produced H2. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H2. 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 ∼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 ∼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 ∼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.

AB - Seawater electrolysis is promising as an in situ H2 production method, allowing immediate overseas transport of the produced H2. In this study, membraneless electrolysis of undisturbed, unbuffered seawater (pH 8.2) is proposed to produce high-purity H2. 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 ∼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 ∼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 ∼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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