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Engineering oxygen vacancies in perovskite oxides by in-situ electrochemical activation for highly efficient nitrate reduction.

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Title: Engineering oxygen vacancies in perovskite oxides by in-situ electrochemical activation for highly efficient nitrate reduction.
Authors: Yang, Li-Hui1 (AUTHOR), Lin, Ze-Qin1 (AUTHOR), Liao, Man-Ting1 (AUTHOR), Yang, Wen-Jian1 (AUTHOR), Pan, Jian-Xin1 (AUTHOR), Li, Wei1 (AUTHOR), Yang, Cao1 (AUTHOR), Wu, Yan-Juan2 (AUTHOR), Wang, Guang-Zhao1,2 (AUTHOR) wyj1207022@163.com, Lv, Si-Hao1 (AUTHOR) 23817001@qq.com
Source: Applied Surface Science. Dec2023, Vol. 639, pN.PAG-N.PAG. 1p.
Subjects: Denitrification, Perovskite, Electrolytic reduction, Oxides, Oxygen, Catalytic activity, Electrocatalysts
Abstract: [Display omitted] • Electrochemical activation (EA) was developed for oxygen vacancies (OVs) creation in La 0.9 FeO 3. • NO 3 −-N removal rate increased 2.6-fold on activated La 0.9 FeO 3 compared to pristine La 0.9 FeO 3. • More OVs increased the adsorption energy of NO 3 − and promotes atomic H* formation. • Stability experiment and general test demonstrated the practicality of the EA strategy. Perovskite oxides have emerged as a new category of catalysts for NO 3 RR, yet their low intrinsic catalytic activity results in unsatisfactory performance. Oxygen vacancy engineering has recently been found to be effective for improving the NO 3 RR performance of perovskite oxides. Herein, a novel and efficient strategy of electrochemical activation for in-situ oxygen vacancies (OVs) creation in perovskite oxide La 0.9 FeO 3-δ was reported. The results showed that the NO 3 −-N removal rate increased 2.6-fold on activated La 0.9 FeO 3-δ in comparison to pristine La 0.9 FeO 3-δ. The enhanced NO 3 RR performance was attributed to the presence of more OVs, which served to increase the adsorption energy of NO 3 − while also promoting atomic H* formation for NO 3 −-N hydrogenation. Furthermore, a continuous experiment lasting 240 h found the activated La 0.9 FeO 3-δ exhibited extremely high stability. Additionally, we demonstrated that the electrochemical activation method was applicable to other typical perovskite oxides, such as LaCoO 3 , indicating its generalizability. This study provides a simple and scalable approach for the preparation of a high-performance perovskite oxide-type electrocatalysts for NO 3 RR. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • Electrochemical activation (EA) was developed for oxygen vacancies (OVs) creation in La 0.9 FeO 3. • NO 3 −-N removal rate increased 2.6-fold on activated La 0.9 FeO 3 compared to pristine La 0.9 FeO 3. • More OVs increased the adsorption energy of NO 3 − and promotes atomic H* formation. • Stability experiment and general test demonstrated the practicality of the EA strategy. Perovskite oxides have emerged as a new category of catalysts for NO 3 RR, yet their low intrinsic catalytic activity results in unsatisfactory performance. Oxygen vacancy engineering has recently been found to be effective for improving the NO 3 RR performance of perovskite oxides. Herein, a novel and efficient strategy of electrochemical activation for in-situ oxygen vacancies (OVs) creation in perovskite oxide La 0.9 FeO 3-δ was reported. The results showed that the NO 3 −-N removal rate increased 2.6-fold on activated La 0.9 FeO 3-δ in comparison to pristine La 0.9 FeO 3-δ. The enhanced NO 3 RR performance was attributed to the presence of more OVs, which served to increase the adsorption energy of NO 3 − while also promoting atomic H* formation for NO 3 −-N hydrogenation. Furthermore, a continuous experiment lasting 240 h found the activated La 0.9 FeO 3-δ exhibited extremely high stability. Additionally, we demonstrated that the electrochemical activation method was applicable to other typical perovskite oxides, such as LaCoO 3 , indicating its generalizability. This study provides a simple and scalable approach for the preparation of a high-performance perovskite oxide-type electrocatalysts for NO 3 RR. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2023.158208