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Insights into the multiple active sites in Bi-Co bimetallic oxide for a deeper understanding of nitrate electroreduction to ammonia.

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Title: Insights into the multiple active sites in Bi-Co bimetallic oxide for a deeper understanding of nitrate electroreduction to ammonia.
Authors: Yang, Li-Hui1 (AUTHOR) yanglh2@126.com, Liao, Man-Ting1 (AUTHOR), Chen, Jun-Tao2 (AUTHOR), Li, Wei1 (AUTHOR), Yang, Cao1 (AUTHOR), Wang, An-Qi1 (AUTHOR), Lv, Si-Hao1 (AUTHOR)
Source: Separation & Purification Technology. Feb2025:Part 8, Vol. 354, pN.PAG-N.PAG. 1p.
Subjects: Oxygen vacancy, Denitrification, Electrolytic reduction, Radiolabeling, Catalytic activity
Abstract: [Display omitted] • A Bi-Co alloy oxide (BCO) was constructed for NO 3 RR, exhibiting excellent performance. • A phenomenon of structure evolution for BCO during NO 3 RR was observed. • Bi0, OVs, and amorphous Co oxide were suggested to be the active sites. • The critical role of multiple active sites in bimetallic oxide were put forward. The electrochemical nitrate reduction reaction (NO 3 RR) is a promising approach for nitrate removal and NH 3 production at ambient conditions. The development of various types of efficient electrocatalysts, especially bimetallic oxides with the advantages of superior durability and excellent catalytic activity, have become a research focus. However, the analysis of active sites for bimetallic oxide catalysts either emphasizes the role of bimetallic interactions or focuses on the role of oxygen vacancies (OVs), resulting in a lack of thoroughness. Herein, a Bi-Co bimetallic oxide (BCO) was constructed for NO 3 RR, illustrating 1.5∼7.8 folds higher NH 3 yield rate than those of commercial single metal oxide (Bi 2 O 3 , Co 3 O 4). The NO 3 RR pathway by BCO was explored according to H* capture test, DEMS, and isotope labeling experiment. An in-situ Raman test showed the structure evolution of BCO during NO 3 RR, and therefore the catalytic sites of BCO were further identified according to physical characteristics before and after NO 3 RR. Results suggest that Bi0, OVs and amorphous Co oxide as the real active sites play a vital role in nitrate electroreduction. Furthermore, research on 25 articles also indicates the presence of multiple catalytic sites in bimetallic oxides for NO 3 RR. This study provides a new and comprehensive insight into the active sites identification for the type of bimetallic oxide NO 3 RR electrocatalysts. [ABSTRACT FROM AUTHOR]
Copyright of Separation & Purification Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Group: Ti
  Data: Insights into the multiple active sites in Bi-Co bimetallic oxide for a deeper understanding of nitrate electroreduction to ammonia.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Li-Hui%22">Yang, Li-Hui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yanglh2@126.com</i><br /><searchLink fieldCode="AR" term="%22Liao%2C+Man-Ting%22">Liao, Man-Ting</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Jun-Tao%22">Chen, Jun-Tao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Wei%22">Li, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Cao%22">Yang, Cao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+An-Qi%22">Wang, An-Qi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lv%2C+Si-Hao%22">Lv, Si-Hao</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Separation+%26+Purification+Technology%22">Separation & Purification Technology</searchLink>. Feb2025:Part 8, Vol. 354, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Oxygen+vacancy%22">Oxygen vacancy</searchLink><br /><searchLink fieldCode="DE" term="%22Denitrification%22">Denitrification</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytic+reduction%22">Electrolytic reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Radiolabeling%22">Radiolabeling</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+activity%22">Catalytic activity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: [Display omitted] • A Bi-Co alloy oxide (BCO) was constructed for NO 3 RR, exhibiting excellent performance. • A phenomenon of structure evolution for BCO during NO 3 RR was observed. • Bi0, OVs, and amorphous Co oxide were suggested to be the active sites. • The critical role of multiple active sites in bimetallic oxide were put forward. The electrochemical nitrate reduction reaction (NO 3 RR) is a promising approach for nitrate removal and NH 3 production at ambient conditions. The development of various types of efficient electrocatalysts, especially bimetallic oxides with the advantages of superior durability and excellent catalytic activity, have become a research focus. However, the analysis of active sites for bimetallic oxide catalysts either emphasizes the role of bimetallic interactions or focuses on the role of oxygen vacancies (OVs), resulting in a lack of thoroughness. Herein, a Bi-Co bimetallic oxide (BCO) was constructed for NO 3 RR, illustrating 1.5∼7.8 folds higher NH 3 yield rate than those of commercial single metal oxide (Bi 2 O 3 , Co 3 O 4). The NO 3 RR pathway by BCO was explored according to H* capture test, DEMS, and isotope labeling experiment. An in-situ Raman test showed the structure evolution of BCO during NO 3 RR, and therefore the catalytic sites of BCO were further identified according to physical characteristics before and after NO 3 RR. Results suggest that Bi0, OVs and amorphous Co oxide as the real active sites play a vital role in nitrate electroreduction. Furthermore, research on 25 articles also indicates the presence of multiple catalytic sites in bimetallic oxides for NO 3 RR. This study provides a new and comprehensive insight into the active sites identification for the type of bimetallic oxide NO 3 RR electrocatalysts. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Separation & Purification Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.seppur.2024.129425
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        Text: English
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      – SubjectFull: Oxygen vacancy
        Type: general
      – SubjectFull: Denitrification
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      – SubjectFull: Electrolytic reduction
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      – SubjectFull: Radiolabeling
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      – SubjectFull: Catalytic activity
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      – TitleFull: Insights into the multiple active sites in Bi-Co bimetallic oxide for a deeper understanding of nitrate electroreduction to ammonia.
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              M: 02
              Text: Feb2025:Part 8
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              Y: 2025
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