Oxygen-vacancy-containing Nb<sub>2</sub>O<sub>5</sub> nanorods with modified semiconductor character for boosting selective nitrate-to-ammonia electroreduction

Cao, Boxuan; Xu, Xun; Hong, Zhuozheng; Liao, Junzhi; Li, Ping; Zhang, Hao; Duo, Shuwang

doi:10.1039/d1se01855h

Cited by 9 publications

(10 citation statements)

References 43 publications

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“…Huang et al [5c] found that OVs derived from Zn 2+ doping remarkably reduced charge-transfer resistance and boosted the charge transfer rate for NO 3 − RR of 3D flower-like ZnCo 2 O 4 from EIS analysis. The same trend was also observed by Cao et al [154] who explored that OVs can facilitate charge transport of Nb 2 O 5 from UV-vis DRS, VB-XPS, and EIS data. Based on the Kubelka-Munk, the calculated bandgap of Nb 2 O 5−x was 2.25 eV, which is much lower than that of Nb 2 O 5 , ≈2.72 eV.…”

Section: Enhancing Transport Propertiessupporting

confidence: 82%

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

et al. 2023

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Sluggish reaction kinetics and the undesired side reactions (hydrogen evolution reaction and self‐reduction) are the main bottlenecks of electrochemical conversion reactions, such as the carbon dioxide and nitrate reduction reactions (CO2RR and NO3RR). To date, conventional strategies to overcome these challenges involve electronic structure modification and modulation of the charge‐transfer behavior. Nonetheless, key aspects of surface modification, focused on boosting the intrinsic activity of active sites on the catalyst surface, are yet to be fully understood. Engingeering of oxygen vacancies (OVs) can tune surface/bulk electronic structure and improve surface active sites of electrocatalysts. The continuous breakthroughs and significant progress in the last decade position engineering of OVs as a potential technique for advancing electrocatalysis. Motivated by this, the state‐of‐the‐art findings of the roles of OVs in both the CO2RR and the NO3RR are presented. The review starts with a description of approaches to constructing and techniques for characterizing OVs. This is followed by an overview of the mechanistic understanding of the CO2RR and a detailed discussion on the roles of OVs in the CO2RR. Then, insights into the NO3RR mechanism and the potential of OVs on NO3RR based on early findings are highlighted. Finally, the challenges in designing CO2RR/NO3RR electrocatalysts and perspectives in studying OV engineering are provided.

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Section: Enhancing Transport Propertiessupporting

confidence: 82%

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

et al. 2023

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“…This could be attributed to the promotion of nitrate reduction by the presence of oxygen vacancies, which was consistent with previous reports. 3,25–29 It was worth noting that the current density of L 0.9 F in the electrolyte without nitrate was remarkably lower than that of LF. This proved that the oxygen vacancies could even suppress the competitive HER.…”

Section: Resultsmentioning

confidence: 97%

“…L 0.9 F showed the prominent faradaic efficiency among iron-based catalysts, 5,6 perovskite catalysts 12,13 or oxygen vacancy-rich catalysts. 25–27…”

Section: Resultsmentioning

confidence: 99%

“…This proved that the oxygen vacancies could even suppress the competitive HER. 26 The experimental results of electrocatalytically reducing nitrate on La x FeO 3Àd (x ¼ 1, 0.95, 0.9) catalysts at À0.7 V are presented in Fig. 4(b) (see Fig.…”

Section: Electrochemical Experimentsmentioning

confidence: 99%

“…L 0.9 F showed the prominent faradaic efficiency among iron-based catalysts, 5,6 perovskite catalysts 12,13 or oxygen vacancy-rich catalysts. [25][26][27] In addition to NH 3 , the electrocatalytic reduction reaction of nitrate also produced a small amount of the byproduct, NO 2 À . Fig.…”

Section: Electrochemical Experimentsmentioning

confidence: 99%

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Electrochemical ammonia synthesisvianitrate reduction on perovskite La_xFeO_3−δwith enhanced efficiency by oxygen vacancy engineering

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Nanostructured Ceria–Niobia Catalyst for Selective Synthesis of N‐Benzylideneanilines

Putla,

Swapna,

Kumar

et al. 2024

ChemCatChem

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The shape and structure engineering of metal oxide nanomaterials are the potential strategies to optimize surface‐active sites with tunable selectivity for heterogeneous catalysis. This work reports the synthesis of two types of nanostructured CeO2‐Nb2O5 catalysts: (i) one‐pot hydrothermal synthesis of CeO2‐Nb2O5 (CeNb2O5‐HTS) and (ii) CeO2 impregnation on hydrothermally synthesized Nb2O5 nanorods (CeNb2O5‐WI) to elucidate the role of particle shape and CeO2 addition in the structure‐activity efficacy of Nb2O5 nanocatalyst for the selective oxidative C‐N coupling of benzyl alcohol with aniline to produce N‐benzylideneaniline (NBA). The characterization studies showed nanorod morphology of Nb2O5 and high dispersion of CeO2 on Nb2O5 nanorods in the CeNb2O5‐WI catalyst with strong acidic sites and more oxygen vacancies. Consequently, a significantly enhanced catalytic activity was achieved with CeNb2O5‐WI nanocatalyst in the coupling of benzyl alcohol and aniline with 96% yield to NBA, whereas 62% conversion of aniline with 92% selectivity to NBA was obtained with pure Nb2O5 nanorods. In contrast, the CeNb2O5‐HTS catalyst gave 37% conversion of aniline only. The versatile efficiency of the CeNb2O5‐WI nanocatalyst is showcased by synthesizing various functional NBA products. The CeNb2O5‐WI catalyst can be recycled 5 times without much variation in NBA selectivity by achieving reasonably good conversion of aniline.

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Oxygen-vacancy-containing Nb₂O₅ nanorods with modified semiconductor character for boosting selective nitrate-to-ammonia electroreduction

Abstract: The Nb2O5−x nanorods with changeable semiconductor character and band structure could serve as an efficient catalyst for sustainable nitrate-to-ammonia electroreduction.

Cited by 9 publications

References 43 publications

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

Electrochemical ammonia synthesisvianitrate reduction on perovskite La_xFeO_3−δwith enhanced efficiency by oxygen vacancy engineering

Nanostructured Ceria–Niobia Catalyst for Selective Synthesis of N‐Benzylideneanilines

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Oxygen-vacancy-containing Nb2O5 nanorods with modified semiconductor character for boosting selective nitrate-to-ammonia electroreduction

Abstract: The Nb2O5−x nanorods with changeable semiconductor character and band structure could serve as an efficient catalyst for sustainable nitrate-to-ammonia electroreduction.

Cited by 9 publications

References 43 publications

Defective Metal Oxides: Lessons from CO2RR and Applications in NOxRR

Defective Metal Oxides: Lessons from CO2RR and Applications in NOxRR

Electrochemical ammonia synthesisvianitrate reduction on perovskite LaxFeO3−δwith enhanced efficiency by oxygen vacancy engineering

Nanostructured Ceria–Niobia Catalyst for Selective Synthesis of N‐Benzylideneanilines

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Product

Resources

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Oxygen-vacancy-containing Nb₂O₅ nanorods with modified semiconductor character for boosting selective nitrate-to-ammonia electroreduction

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

Defective Metal Oxides: Lessons from CO₂RR and Applications in NO_xRR

Electrochemical ammonia synthesisvianitrate reduction on perovskite La_xFeO_3−δwith enhanced efficiency by oxygen vacancy engineering