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Perovskite oxide LaMO3-δ (M = Fe, Co, Ni and Cu) cathode for efficient electroreduction of nitrate.

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Title: Perovskite oxide LaMO3-δ (M = Fe, Co, Ni and Cu) cathode for efficient electroreduction of nitrate.
Authors: Yang, Wen-Jian1 (AUTHOR), Yang, Li-Hui1 (AUTHOR), Peng, Han-Jun1 (AUTHOR), Lv, Si-Hao1 (AUTHOR), Muhammad Adeel Sharif, Hafiz2 (AUTHOR), Sun, Wei1 (AUTHOR), Li, Wei1 (AUTHOR), Yang, Cao1 (AUTHOR), Lin, Hui1 (AUTHOR) linhui@dgut.edu.cn
Source: Separation & Purification Technology. Aug2022, Vol. 295, pN.PAG-N.PAG. 1p.
Subjects: Electrolytic reduction, Cathodes, Oxidation-reduction reaction, Electron sources, Oxides, Catalytic activity, Perovskite
Abstract: [Display omitted] • Perovskite oxide LaMO 3-δ cathodes were applied for NO 3 –-N electroreduction. • La 2 CuO 4 exhibited best catalytic performance as its super electrochemical property. • The selectivity of NH 4 +-N and N 2 were 82.4 ± 2.2% and 9.4 ± 2.4%, respectively. • Both electron- and H*-mediated pathway occurred for NO 3 –-N electroreduction. • Oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) worked for NO 3 –-N reduction. Electroreduction removal of nitrate (NO 3 –-N) is considered as a promising approach to solve its adverse effects on environment and human health, where efficient and cheap catalysts are required. Perovskite-based catalysts showed a versatile catalytic ability for wide range of redox reactions, but seldom applied for NO 3 –-N reduction. Herein, four perovskite oxide cathodes, LaMO 3-δ (M = Fe, Co, Ni and Cu) were prepared and used for the reduction of NO 3 –-N. The Ruddlesden-Popper (RP) type La 2 CuO 4 exhibited the best NO 3 –-N catalytic activity among the four perovskite oxide cathodes, with a removal rate of 11.7 × 10-3 min−1. The high selectivity of NH 4 +-N (82.4 ± 2.2%) indicated that NH 4 +-N was the main final product for NO 3 –-N electroreduction at La 2 CuO 4 cathode, but 100% of N 2 selectivity could be obtained with addition of 1000 and 1500 mg/L Cl- as the electro-assisted chlorination process. The mechanism of NO 3 –-N electroreduction occurred by both electron- and H*-mediated pathway, and the oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) were proposed as the accommodation sties and direct electron sources for NO 3 –-N reduction. Generally, this study opens a novel avenue for the development of earth-abundant, cost-effective catalyst with effective NO 3 –-N electroreduction. [ABSTRACT FROM AUTHOR]
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Abstract:[Display omitted] • Perovskite oxide LaMO 3-δ cathodes were applied for NO 3 –-N electroreduction. • La 2 CuO 4 exhibited best catalytic performance as its super electrochemical property. • The selectivity of NH 4 +-N and N 2 were 82.4 ± 2.2% and 9.4 ± 2.4%, respectively. • Both electron- and H*-mediated pathway occurred for NO 3 –-N electroreduction. • Oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) worked for NO 3 –-N reduction. Electroreduction removal of nitrate (NO 3 –-N) is considered as a promising approach to solve its adverse effects on environment and human health, where efficient and cheap catalysts are required. Perovskite-based catalysts showed a versatile catalytic ability for wide range of redox reactions, but seldom applied for NO 3 –-N reduction. Herein, four perovskite oxide cathodes, LaMO 3-δ (M = Fe, Co, Ni and Cu) were prepared and used for the reduction of NO 3 –-N. The Ruddlesden-Popper (RP) type La 2 CuO 4 exhibited the best NO 3 –-N catalytic activity among the four perovskite oxide cathodes, with a removal rate of 11.7 × 10-3 min−1. The high selectivity of NH 4 +-N (82.4 ± 2.2%) indicated that NH 4 +-N was the main final product for NO 3 –-N electroreduction at La 2 CuO 4 cathode, but 100% of N 2 selectivity could be obtained with addition of 1000 and 1500 mg/L Cl- as the electro-assisted chlorination process. The mechanism of NO 3 –-N electroreduction occurred by both electron- and H*-mediated pathway, and the oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) were proposed as the accommodation sties and direct electron sources for NO 3 –-N reduction. Generally, this study opens a novel avenue for the development of earth-abundant, cost-effective catalyst with effective NO 3 –-N electroreduction. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2022.121278