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Electrochemical nitrate reduction reaction (NO3RR) towards ammonia, as an emerging and appealing technology alternative to the energy-intensive Haber–Bosch process and inefficient nitrogen reduction reaction, has recently aroused wide concern and research. However, the current research of the NO3RR towards ammonia lacks the overall performance comparison of various electrocatalysts. Given this, we here make a comparison of 12 common transition metal oxide catalysts for the NO3RR under a high cathodic current density of 0.25 A·cm−2, wherein Co3O4 catalyst displays the highest ammonia Faradaic efficiency (85.15%) and moderate activity (ca. −0.25 V vs. reversible hydrogen electrode). Other external factors, such as nitrate concentrations in the electrolyte and applied potential ranges, have also been specifically investigated for the NO3RR.


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Screening of transition metal oxides for electrocatalytic nitrate reduction to ammonia at large currents

Show Author's information Qiongfei Wu1,§Weijie Zhu1,§Dongxu Ma1Chao Liang2Zhoucheng Wang1Hanfeng Liang1( )
State Key Laboratory of Physical Chemistry of Solid Surfaces, Tan Kah Kee Innovation Laboratory, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
College of Chemical Engineering, Tianjin University, Tianjin 300072, China

§ Qiongfei Wu and Weijie Zhu contributed equally to this work.

Abstract

Electrochemical nitrate reduction reaction (NO3RR) towards ammonia, as an emerging and appealing technology alternative to the energy-intensive Haber–Bosch process and inefficient nitrogen reduction reaction, has recently aroused wide concern and research. However, the current research of the NO3RR towards ammonia lacks the overall performance comparison of various electrocatalysts. Given this, we here make a comparison of 12 common transition metal oxide catalysts for the NO3RR under a high cathodic current density of 0.25 A·cm−2, wherein Co3O4 catalyst displays the highest ammonia Faradaic efficiency (85.15%) and moderate activity (ca. −0.25 V vs. reversible hydrogen electrode). Other external factors, such as nitrate concentrations in the electrolyte and applied potential ranges, have also been specifically investigated for the NO3RR.

Keywords: transition metal oxides, Co3O4, nitrate reduction reaction, ammonia production

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Publication history
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Acknowledgements

Publication history

Received: 10 October 2023
Revised: 24 November 2023
Accepted: 28 November 2023
Published: 12 January 2024
Issue date: May 2024

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© Tsinghua University Press 2023

Acknowledgements

Acknowledgement

This work was supported by the Fundamental Research Funds for the Central Universities, China (No. 20720210010), the National Natural Science Foundation of China (Nos. 22001081 and 22075236), and the Science and Technology Projects of Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM, No. HRTP-[2022]-7).

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