An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

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 wit...

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Autores principales:	Mengfei Zhang, Hao Li, Xiuyun Duan, Peimiao Zou, Georgina Jeerh, Boyao Sun, Shigang Chen, John Humphreys, Marc Walker, Kui Xie, Shanwen Tao
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	ammonia oxidation reaction ammonia removal bifunctional hydrogen evolution reaction perovskites symmetric ammonia electrolyzer Science Q
Acceso en línea:	https://doaj.org/article/c18cf7ca087f4693b7d386f59b2c1b71
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spelling	oai:doaj.org-article:c18cf7ca087f4693b7d386f59b2c1b712021-11-17T08:40:31ZAn Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis2198-384410.1002/advs.202101299https://doaj.org/article/c18cf7ca087f4693b7d386f59b2c1b712021-11-01T00:00:00Zhttps://doi.org/10.1002/advs.202101299https://doaj.org/toc/2198-3844Abstract 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.Mengfei ZhangHao LiXiuyun DuanPeimiao ZouGeorgina JeerhBoyao SunShigang ChenJohn HumphreysMarc WalkerKui XieShanwen TaoWileyarticleammonia oxidation reactionammonia removalbifunctionalhydrogen evolution reactionperovskitessymmetric ammonia electrolyzerScienceQENAdvanced Science, Vol 8, Iss 22, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ammonia oxidation reaction ammonia removal bifunctional hydrogen evolution reaction perovskites symmetric ammonia electrolyzer Science Q
spellingShingle	ammonia oxidation reaction ammonia removal bifunctional hydrogen evolution reaction perovskites symmetric ammonia electrolyzer Science Q Mengfei Zhang Hao Li Xiuyun Duan Peimiao Zou Georgina Jeerh Boyao Sun Shigang Chen John Humphreys Marc Walker Kui Xie Shanwen Tao An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
description	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.
format	article
author	Mengfei Zhang Hao Li Xiuyun Duan Peimiao Zou Georgina Jeerh Boyao Sun Shigang Chen John Humphreys Marc Walker Kui Xie Shanwen Tao
author_facet	Mengfei Zhang Hao Li Xiuyun Duan Peimiao Zou Georgina Jeerh Boyao Sun Shigang Chen John Humphreys Marc Walker Kui Xie Shanwen Tao
author_sort	Mengfei Zhang
title	An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
title_short	An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
title_full	An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
title_fullStr	An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
title_full_unstemmed	An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis
title_sort	efficient symmetric electrolyzer based on bifunctional perovskite catalyst for ammonia electrolysis
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/c18cf7ca087f4693b7d386f59b2c1b71
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An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

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