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High-Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H$_2$O Ternary Electrolyte
Shahid, Usman Kwon, Yongjun Yuan, Yuan Gu, Shuang Shao, Minhua
Shahid, Usman
Kwon, Yongjun
Yuan, Yuan
Gu, Shuang
Shao, Minhua
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Shahid, Usman
Kwon, Yongjun
Yuan, Yuan
Gu, Shuang
Shao, Minhua
Kwon, Yongjun
Yuan, Yuan
Gu, Shuang
Shao, Minhua
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2024
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Shahid, U.B., Kwon, Y., Yuan, Y., Gu, S., Shao, M. High-Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H$_2$O Ternary Electrolyte. (2024). Angewandte Chemie - International Edition. DOI: 10.1002/anie.202403633
Abstract
A glut of dinitrogen-derived ammonia (NH$_3$) over the past century has resulted in a heavily imbalanced nitrogen cycle and consequently, the large-scale accumulation of reactive nitrogen such as nitrates in our ecosystems has led to detrimental environmental issues. Electrocatalytic upcycling of waste nitrogen back into NH$_3$ holds promise in mitigating these environmental impacts and reducing reliance on the energy-intensive Haber–Bosch process. Herein, we report a high-performance electrolyzer using an ultrahigh alkalinity electrolyte, NaOH−KOH−H$_2$O, for low-cost NH$_3$ electrosynthesis. At 3,000 mA/cm$^2$, the device with a Fe−Cu−Ni ternary catalyst achieves an unprecedented faradaic efficiency (FE) of 92.5±1.5 % under a low cell voltage of 3.83 V; whereas at 1,000 mA/cm$^2$, an FE of 96.5±4.8 % under a cell voltage of only 2.40 V was achieved. Techno-economic analysis revealed that our device cuts the levelized cost of ammonia electrosynthesis by ~40 % (30.68 dollars for Fe−Cu−Ni vs. 48.53 dollars for Ni foam per kmol-NH$_3$). The NaOH−KOH−H$_2$O electrolyte together with the Fe−Cu−Ni ternary catalyst can enable the high-throughput nitrate-to-ammonia applications for affordable and scalable real-world wastewater treatments. © 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.
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© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
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John Wiley and Sons Inc
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Angewandte Chemie - International Edition
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1433-7851