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An efficient symmetric electrolyzer based on bifunctional perovskite catalyst for ammonia electrolysis

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Zhang, Mengfei, Li, Hao, Duan, Xiuyun, Zou, Peimiao, Jeerh, Georgina, Sun, Boyao, Chen, Shigang, Humphreys, John, Walker, Marc, Xie, Kui and Tao, Shanwen (2021) An efficient symmetric electrolyzer based on bifunctional perovskite catalyst for ammonia electrolysis. Advanced Science, 8 (22). 2101299. doi:10.1002/advs.202101299 ISSN 2198-3844.

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Official URL: https://doi.org/10.1002/advs.202101299

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Abstract

Ammonia is a natural pollutant in wastewater and removal technique such as ammonia electro‐oxidation is of paramount importance. The development of highly efficient and low‐costing electrocatalysts for the ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) associated with ammonia removal is subsequently crucial. In this study, for the first time, the authors demonstrate that a perovskite oxide LaNi0.5Cu0.5O3‐δ after being annealed in Ar (LNCO55‐Ar), is an excellent non‐noble bifunctional catalyst towards both AOR and HER, making it suitable as a symmetric ammonia electrolyser (SAE) in alkaline medium. In contrast, the LNCO55 sample fired in air (LNCO55‐Air) is inactive towards AOR and shows very poor HER activity. Through combined experimental results and theoretical calculations, it is found that the superior AOR and HER activities are attributed to the increased active sites, the introduction of oxygen vacancies, the synergistic effect of B‐site cations and the different active sites in LNCO55‐Ar. At 1.23 V, the assembled SAE demonstrates ≈100% removal efficiency in 2210 ppm ammonia solution and >70% in real landfill leachate. This work opens the door for developments towards bifunctional catalysts, and also takes a profound step towards the development of low‐costing and simple device configuration for ammonia electrolysers.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Journal or Publication Title: Advanced Science
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
ISSN: 2198-3844
Official Date: 17 November 2021
Dates:
DateEvent
17 November 2021Published
8 October 2021Available
19 July 2021Accepted
Volume: 8
Number: 22
Article Number: 2101299
DOI: 10.1002/advs.202101299
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 28 October 2021
Date of first compliant Open Access: 28 October 2021
Related URLs:
  • http://creativecommons.org/licenses/by/4...

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