In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals

Byeong ju Kim; Ho Kyong Shon; Dong Suk Han; Hyunwoong Park

doi:10.1016/j.desal.2023.116431

In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals

Byeong ju Kim, Ho Kyong Shon, Dong Suk Han, Hyunwoong Park

School of Energy Engineering

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

17 Scopus citations

Abstract

An efficient multi-functional electrolyzer with a Ni- and Fe-layered double hydroxide (NiFe-LDH) anode and a binary NiMo cathode is designed for overall water splitting coupled with the desalination of saline water and production of value-added chemicals. The NiFe-LDH and NiMo pairs separated by a bipolar membrane (BPM) show overpotentials as low as those of noble metal catalysts for oxygen and hydrogen evolution reactions in 1 M KOH and 1 M H₂SO₄ solutions, respectively. Arraying anion and cation-exchange membranes (AEMs and CEMs, respectively) with BPMs (NiFe-LDH/BPM/[AEM/CEM]_n/BPM/NiMo; n = 1 or 5) further enables the desalination of brackish water and seawater at specific energy consumption of 1.8 kWh m⁻³, with concurrent production of HCl and NaOH. The Faradaic efficiencies of the device for O₂ and H₂ production are >95 % at J = 100 mA cm⁻² over 20 h, while the initial pH values of the anolyte and catholyte remain unchanged. Detailed surface characterization of the electrocatalysts is performed, and various electrolyzer configurations are compared in terms of desalination efficiency.

Original language	English
Article number	116431
Journal	Desalination
Volume	551
DOIs	https://doi.org/10.1016/j.desal.2023.116431
State	Published - 1 Apr 2023

Keywords

Acid and base
Bipolar membrane
Desalination
Electrocatalysis
Seawater electrolysis

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10.1016/j.desal.2023.116431

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title = "In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals",

abstract = "An efficient multi-functional electrolyzer with a Ni- and Fe-layered double hydroxide (NiFe-LDH) anode and a binary NiMo cathode is designed for overall water splitting coupled with the desalination of saline water and production of value-added chemicals. The NiFe-LDH and NiMo pairs separated by a bipolar membrane (BPM) show overpotentials as low as those of noble metal catalysts for oxygen and hydrogen evolution reactions in 1 M KOH and 1 M H2SO4 solutions, respectively. Arraying anion and cation-exchange membranes (AEMs and CEMs, respectively) with BPMs (NiFe-LDH/BPM/[AEM/CEM]n/BPM/NiMo; n = 1 or 5) further enables the desalination of brackish water and seawater at specific energy consumption of 1.8 kWh m−3, with concurrent production of HCl and NaOH. The Faradaic efficiencies of the device for O2 and H2 production are >95 % at J = 100 mA cm−2 over 20 h, while the initial pH values of the anolyte and catholyte remain unchanged. Detailed surface characterization of the electrocatalysts is performed, and various electrolyzer configurations are compared in terms of desalination efficiency.",

keywords = "Acid and base, Bipolar membrane, Desalination, Electrocatalysis, Seawater electrolysis",

author = "Kim, {Byeong ju} and Shon, {Ho Kyong} and Han, {Dong Suk} and Hyunwoong Park",

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doi = "10.1016/j.desal.2023.116431",

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T1 - In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals

AU - Kim, Byeong ju

AU - Shon, Ho Kyong

AU - Han, Dong Suk

AU - Park, Hyunwoong

PY - 2023/4/1

Y1 - 2023/4/1

N2 - An efficient multi-functional electrolyzer with a Ni- and Fe-layered double hydroxide (NiFe-LDH) anode and a binary NiMo cathode is designed for overall water splitting coupled with the desalination of saline water and production of value-added chemicals. The NiFe-LDH and NiMo pairs separated by a bipolar membrane (BPM) show overpotentials as low as those of noble metal catalysts for oxygen and hydrogen evolution reactions in 1 M KOH and 1 M H2SO4 solutions, respectively. Arraying anion and cation-exchange membranes (AEMs and CEMs, respectively) with BPMs (NiFe-LDH/BPM/[AEM/CEM]n/BPM/NiMo; n = 1 or 5) further enables the desalination of brackish water and seawater at specific energy consumption of 1.8 kWh m−3, with concurrent production of HCl and NaOH. The Faradaic efficiencies of the device for O2 and H2 production are >95 % at J = 100 mA cm−2 over 20 h, while the initial pH values of the anolyte and catholyte remain unchanged. Detailed surface characterization of the electrocatalysts is performed, and various electrolyzer configurations are compared in terms of desalination efficiency.

AB - An efficient multi-functional electrolyzer with a Ni- and Fe-layered double hydroxide (NiFe-LDH) anode and a binary NiMo cathode is designed for overall water splitting coupled with the desalination of saline water and production of value-added chemicals. The NiFe-LDH and NiMo pairs separated by a bipolar membrane (BPM) show overpotentials as low as those of noble metal catalysts for oxygen and hydrogen evolution reactions in 1 M KOH and 1 M H2SO4 solutions, respectively. Arraying anion and cation-exchange membranes (AEMs and CEMs, respectively) with BPMs (NiFe-LDH/BPM/[AEM/CEM]n/BPM/NiMo; n = 1 or 5) further enables the desalination of brackish water and seawater at specific energy consumption of 1.8 kWh m−3, with concurrent production of HCl and NaOH. The Faradaic efficiencies of the device for O2 and H2 production are >95 % at J = 100 mA cm−2 over 20 h, while the initial pH values of the anolyte and catholyte remain unchanged. Detailed surface characterization of the electrocatalysts is performed, and various electrolyzer configurations are compared in terms of desalination efficiency.

KW - Acid and base

KW - Bipolar membrane

KW - Desalination

KW - Electrocatalysis

KW - Seawater electrolysis

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In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals

Abstract

Keywords

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