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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]
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Database: Engineering Source
Description
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]
ISSN:13835866
DOI:10.1016/j.seppur.2024.129425