Volume 63, Issue 6 e202318792
Research Article

Aqueous Electroreduction of Nitric Oxide to Ammonia at Low Concentration via Vacancy Engineered FeOCl

Xiaoxi Guo

Xiaoxi Guo

School of Materials Science and Engineering, Central South University, Changsha, 410083 Hunan, P. R. China

Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, Changsha, 410083 Hunan, P. R. China

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Pai Wang

Pai Wang

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 Sichuan, P. R. China

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Prof. Tongwei Wu

Corresponding Author

Prof. Tongwei Wu

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 Sichuan, P. R. China

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Zhiqiang Wang

Zhiqiang Wang

Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Prof. Jiong Li

Prof. Jiong Li

Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 P. R. China

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Dr. Kang Liu

Dr. Kang Liu

Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, Changsha, 410083 Hunan, P. R. China

School of Metallurgy and Environment, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Junwei Fu

Prof. Junwei Fu

Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Min Liu

Prof. Min Liu

College of Nuclear Science and Technology, University of South China, Hengyang, 421001 Hunan, P. R. China

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Dr. Jun Wu

Corresponding Author

Dr. Jun Wu

School of Metallurgy and Environment, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Dr. Zhang Lin

Prof. Dr. Zhang Lin

School of Metallurgy and Environment, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Liyuan Chai

Prof. Liyuan Chai

School of Metallurgy and Environment, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Zhenfeng Bian

Corresponding Author

Prof. Zhenfeng Bian

MOE Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, 200234 P. R. China

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Prof. Hengfeng Li

Corresponding Author

Prof. Hengfeng Li

School of Materials Science and Engineering, Central South University, Changsha, 410083 Hunan, P. R. China

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Prof. Min Liu

Corresponding Author

Prof. Min Liu

Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, Changsha, 410083 Hunan, P. R. China

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First published: 20 December 2023
Citations: 27

Graphical Abstract

A Cl vacancy strategy results in a lower Fe oxidation state with sharp d-states characteristics to enhance the adsorption and activation of NO, which overcomes the sluggish kinetics of NORR and competitive HER over FeOCl-VCl, especially at low concentrations of NO, and improves the catalytic activity and selectivity towards NORR.

Abstract

Electroreduction of nitric oxide (NO) to NH3 (NORR) has gained extensive attention for the sake of low carbon emission and air pollutant treatment. Unfortunately, NORR is greatly hindered by its sluggish kinetics, especially under low concentrations of NO. Herein, we developed a chlorine (Cl) vacancy strategy to overcome this limitation over FeOCl nanosheets (FeOCl-VCl). Density functional theory (DFT) calculations revealed that the Cl vacancy resulted in defective Fe with sharp d-states characteristics in FeOCl-VCl to enhance the absorption and activation of NO. In situ X-ray absorption near-edge structure (XANES) and attenuated total reflection-infrared spectroscopy (ATR-IR) verified the lower average oxidation state of defective Fe to enhance the electron transfer for NO adsorption/activation and facilitate the generation of key NHO and NHx intermediates. As a result, the FeOCl-VCl exhibited superior NORR activities with the NH3 Faradaic efficiency up to 91.1 % while maintaining a high NH3 yield rate of 455.4 μg cm−2 h−1 under 1.0 vol % NO concentration, competitive with those of previously reported literatures under higher NO concentration. Further, the assembled Zn-NO battery utilizing FeOCl-VCl as cathode delivered a record peak power density of 6.2 mW cm−2, offering a new route for simultaneous NO removal, NH3 production, and energy supply.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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