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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
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WRAP-Efficient-symmetric-electrolyzer-bifunctional-perovskite-ammonia-electrolysis-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2563Kb) | Preview |
Official URL: https://doi.org/10.1002/advs.202101299
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 | ||||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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| 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 | ||||||||
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| 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 | ||||||||
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