Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions

Kato, Shintaro; Ito, Shotaro; Nakahata, Shoko; Kurihara, Ryo; Harada, Takashi; Nakanishi, Shuji; Kamiya, Kazuhide

doi:https://doi.org/10.1002/cssc.202401013

Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions

Kato, Shintaro; Ito, Shotaro; Nakahata, Shoko et al.

ChemSusChem, 2024, 17(22), e202401013

アクセス数:875件（2025-07-06 17:49 集計）

固定URL: https://hdl.handle.net/11094/98296

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タイトル	Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions
著者	著者名 Kato, Shintaro
	著者名 Ito, Shotaro
	著者名 Nakahata, Shoko
	著者名 Kurihara, Ryo
	NRID 1000000379314 1000000379314 researchmap permalink rcsecharada rcsecharada 著者名 Harada, Takashi
	NRID 1000040333447 1000040333447 ORCID 0000-0002-3313-2689 0000-0002-3313-2689 researchmap permalink read0191166 read0191166 Scopus Author ID 7402706228 7402706228 著者名 Nakanishi, Shuji
	NRID 1000050716016 1000050716016 ORCID 0000-0002-6018-9277 0000-0002-6018-9277 researchmap permalink kamiya0908 kamiya0908 Scopus Author ID 24178005800 24178005800 著者名 Kamiya, Kazuhide
キーワード等	alkali metal cations
	CO2 electrolysis
	membrane electrode assembly electrolyzer
	multi-carbon products
	quantitative analysis
内容	Kato S., Ito S., Nakahata S., et al. Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions. ChemSusChem, (2024); https://doi.org/10.1002/cssc.202401013.
抄録	The stable operation of the CO₂ reduction reaction (CO₂RR) in membrane electrode assembly (MEA) electrolyzers is known to be hindered by the accumulation of bicarbonate salt, which are derived from alkali metal cations in anolytes, on the cathode side. In this study, we conducted a quantitative evaluation of the correlation between the CO₂RR activity and the transported alkali metal cations in MEA electrolyzers. As a result, although the presence of transported alkali metal cations on the cathode surface significantly contributes to the generation of C₂₊ compounds, the rate of K⁺ ion transport did not match the selectivity of C₂₊, suggesting that a continuous supply of high amount of K⁺ to the cathode surface is not required for C₂₊ formation. Based on these findings, we achieved a faradaic efficiency (FE) and a partial current density for C₂₊ of 77 % and 230 mA cm⁻², respectively, even after switching the anode solution from 0.1 M KHCO₃ to a dilute K⁺ solution (<7 mM). These values were almost identical to those when 0.1 M KHCO₃ was continuously supplied. Based on this insight, we successfully improved the durability of the system against salt precipitation by intermittently supplying concentrated KHCO₃, compared with the continuous supply.
出版者	John Wiley and Sons Inc
収録物名	ChemSusChem
巻(号)	17(22)
ページ	e202401013
刊行年月	2024-08-07
言語	英語
ハンドルURL	https://hdl.handle.net/11094/98296
PISSN	18645631
eISSN	1864564X
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1002/cssc.202401013
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	ChemSusChem. 2024, 17(22), p. e202401013
DC.title	Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions
DC.creator	Kato, Shintaro
	Ito, Shotaro
	Nakahata, Shoko
	Kurihara, Ryo
	Harada, Takashi
	Nakanishi, Shuji
	Kamiya, Kazuhide
DC.publisher	John Wiley and Sons Inc
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-08-07
DC.identifier	https://doi.org/10.1002/cssc.202401013
DC.subject	alkali metal cations
	CO2 electrolysis
	membrane electrode assembly electrolyzer
	multi-carbon products
	quantitative analysis
DC.description	Kato S., Ito S., Nakahata S., et al. Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions. ChemSusChem, (2024); https://doi.org/10.1002/cssc.202401013.
DCTERMS.abstract	The stable operation of the CO₂ reduction reaction (CO₂RR) in membrane electrode assembly (MEA) electrolyzers is known to be hindered by the accumulation of bicarbonate salt, which are derived from alkali metal cations in anolytes, on the cathode side. In this study, we conducted a quantitative evaluation of the correlation between the CO₂RR activity and the transported alkali metal cations in MEA electrolyzers. As a result, although the presence of transported alkali metal cations on the cathode surface significantly contributes to the generation of C₂₊ compounds, the rate of K⁺ ion transport did not match the selectivity of C₂₊, suggesting that a continuous supply of high amount of K⁺ to the cathode surface is not required for C₂₊ formation. Based on these findings, we achieved a faradaic efficiency (FE) and a partial current density for C₂₊ of 77 % and 230 mA cm⁻², respectively, even after switching the anode solution from 0.1 M KHCO₃ to a dilute K⁺ solution (<7 mM). These values were almost identical to those when 0.1 M KHCO₃ was continuously supplied. Based on this insight, we successfully improved the durability of the system against salt precipitation by intermittently supplying concentrated KHCO₃, compared with the continuous supply.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	98296
citation_title	Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions
citation_author	Kato, Shintaro
	Ito, Shotaro
	Nakahata, Shoko
	Kurihara, Ryo
	Harada, Takashi
	Nakanishi, Shuji
	Kamiya, Kazuhide
citation_publisher	John Wiley and Sons Inc
citation_language	英語
citation_date	2024-08-07
citation_journal_title	ChemSusChem
citation_volume	17
citation_issue	22
citation_firstpage	e202401013
citation_doi	https://doi.org/10.1002/cssc.202401013
citation_public_url	https://hdl.handle.net/11094/98296

Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions

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