Volume 137, Issue 5 e202417631
Forschungsartikel

Reversible Hydrogen Acceptor–Donor Enables Relay Mechanism for Nitrate-to-Ammonia Electrocatalysis

Yuefei Li

Yuefei Li

Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Youyi Road No. 127, Xi'an, 710072 China

These authors contributed equally to this work.

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Ye Liu

Ye Liu

State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, 030024 China

These authors contributed equally to this work.

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Mingkai Zhang

Mingkai Zhang

School of Science, Xi'an University of Technology, Xi'an, 710048 China

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Linsen Li

Linsen Li

School of Chemical Engineering, Xi'an Jiaotong University, Xianning West Road No. 28, Xi'an, 710048 China

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Prof. Zhao Jiang

Prof. Zhao Jiang

School of Chemical Engineering, Xi'an Jiaotong University, Xianning West Road No. 28, Xi'an, 710048 China

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Dr. Bingying Han

Corresponding Author

Dr. Bingying Han

State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, 030024 China

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Prof. Baojun Wang

Prof. Baojun Wang

State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, 030024 China

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Prof. Jiayuan Li

Corresponding Author

Prof. Jiayuan Li

Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Youyi Road No. 127, Xi'an, 710072 China

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First published: 21 October 2024

Abstract

Electrocatalytic nitrate reduction is a crucial process for sustainable ammonia production. However, to maximize ammonia yield efficiency, this technology inevitably operates at the potentials more negative than 0 V vs. RHE, leading to high energy consumption and competitive hydrogen evolution. To eradicate this issue, hydrogen tungsten bronze (HxWO3) as reversible hydrogen donor-acceptor is partnered with copper (Cu) to enable a relay mechanism at potentials positive than 0 V vs. RHE, which involves rapid intercalation of H into HxWO3 lattice, prompt de-intercalation of the lattice H and transfer onto Cu, and spontaneous H-mediated nitrate-to-ammonia conversion on Cu. The resulting catalysts demonstrated a high ammonia yield rate of 3332.9±34.1 mmol gcat−1 h−1 and a Faraday efficiency of ~100 % at 0.10 V vs. RHE, displaying a record-low estimated energy consumption of 17.6 kWh kgammonia−1. Using these catalysts, we achieve continuous ammonia production in an enlarged flow cell at a real energy consumption of 17.0 kWh kgammonia−1.

Conflict of Interests

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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