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Oxygen vacancy‐rich La 0.5 Sr 1.5 Ni 0.9 Cu 0.1 O 4–δ as a high‐performance bifunctional catalyst for symmetric ammonia electrolyzer

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Zhang, Mengfei, Zou, Peimiao, Jeerh, Georgina, Sun, Boyao, Walker, Marc and Tao, Shanwen (2022) Oxygen vacancy‐rich La 0.5 Sr 1.5 Ni 0.9 Cu 0.1 O 4–δ as a high‐performance bifunctional catalyst for symmetric ammonia electrolyzer. Advanced Functional Materials, 32 (38). 2204881. doi:10.1002/adfm.202204881 ISSN 1616-301X.

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Official URL: https://doi.org/10.1002/adfm.202204881

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Abstract

In this study, strontium and copper dual‐doped La2NiO4 annealed in Ar (La0.5Sr1.5Ni0.9Cu0.1O4‐δ‐Ar, LSNC‐Ar) with K2NiF4 structure is strategically designed as an ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) bifunctional catalyst for high‐efficiency ammonia electrolysis. The selective substitution of lanthanum with high content strontium improves the electronic conductivity and increases the oxygen vacancy concentration. Doping of Cu into the B‐site of the perovskite induces a synergistic interplay of Ni and Cu, leading to excellent AOR activity. Due to the excellent AOR and HER activity of doped La2NiO4, a symmetric ammonia electrolyzer based on LSNC‐Ar (SAE‐LSNC‐Ar) is assembled and investigated for the removal of ammonia. In addition, the performance of the SAE is comparable to the ammonia electrolyzer based on a PtIr/C anode and Pt/C cathode at low voltage. This is the first report using an oxide with the K2NiF4 structure as an efficient AOR catalyst. The assembled SAE‐LSNC‐Ar shows ≈95% ammonia removal efficiency in real landfill leachate, which is the highest among electrochemical removal of ammonia in landfill leachate. This study paves an attractive route to explore materials with the K2NiF4 structure as highly efficient AOR/HER bifunctional catalysts for the electrolysis of ammonia.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Ammonia -- Oxidation, Water -- Purification -- Oxidation
Journal or Publication Title: Advanced Functional Materials
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
ISSN: 1616-301X
Official Date: 19 September 2022
Dates:
DateEvent
19 September 2022Published
7 July 2022Available
15 July 2022Accepted
Volume: 32
Number: 38
Article Number: 2204881
DOI: 10.1002/adfm.202204881
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 1 August 2022
Date of first compliant Open Access: 1 August 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/G030995/1Innovate UKhttp://dx.doi.org/10.13039/501100006041
104010Innovate UKhttp://dx.doi.org/10.13039/501100006041
133714Innovate UKhttp://dx.doi.org/10.13039/501100006041
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