Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH

Takahiro Naito; Tatsuya Shinagawa; Takeshi Nishimoto; Kazuhiro Takanabe

doi:10.1002/cssc.202102294

Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH

Takahiro Naito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

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

6 Scopus citations

Abstract

Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm−2 at a total cell voltage of 1.56 V with 99.9 % purity of produced H2.

Original language	English (US)
Journal	ChemSusChem
Volume	15
Issue number	3
DOIs	https://doi.org/10.1002/cssc.202102294
State	Published - Dec 14 2021
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2022-05-25
Acknowledged KAUST grant number(s): OSR #4191
Acknowledgements: A part of this work was supported by Asahi Kasei Corporation, UTokyo-KAUST collaborative research OSR #4191 “Towards Sustainable Production of H2”, JSPS KAKENHI Grant Number 19K23569, and the Mohammed bin Salman Center for Future Science and Technology for Saudi-Japan Vision 2030 at The University of Tokyo (MbSC2030).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

Energy(all)
Environmental Chemistry
Materials Science(all)
Chemical Engineering(all)

UN SDGs

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

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10.1002/cssc.202102294

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title = "Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH",

abstract = "Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm−2 at a total cell voltage of 1.56 V with 99.9 % purity of produced H2.",

author = "Takahiro Naito and Tatsuya Shinagawa and Takeshi Nishimoto and Kazuhiro Takanabe",

note = "KAUST Repository Item: Exported on 2022-05-25 Acknowledged KAUST grant number(s): OSR #4191 Acknowledgements: A part of this work was supported by Asahi Kasei Corporation, UTokyo-KAUST collaborative research OSR #4191 “Towards Sustainable Production of H2”, JSPS KAKENHI Grant Number 19K23569, and the Mohammed bin Salman Center for Future Science and Technology for Saudi-Japan Vision 2030 at The University of Tokyo (MbSC2030). This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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AU - Takanabe, Kazuhiro

N1 - KAUST Repository Item: Exported on 2022-05-25 Acknowledged KAUST grant number(s): OSR #4191 Acknowledgements: A part of this work was supported by Asahi Kasei Corporation, UTokyo-KAUST collaborative research OSR #4191 “Towards Sustainable Production of H2”, JSPS KAKENHI Grant Number 19K23569, and the Mohammed bin Salman Center for Future Science and Technology for Saudi-Japan Vision 2030 at The University of Tokyo (MbSC2030). This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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Y1 - 2021/12/14

N2 - Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm−2 at a total cell voltage of 1.56 V with 99.9 % purity of produced H2.

AB - Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm−2 at a total cell voltage of 1.56 V with 99.9 % purity of produced H2.

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Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH

Abstract

Bibliographical note

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UN SDGs

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