Volume 63, Issue 24 e202405493
Research Article

Synergistic Al−Al Dual-Atomic Site for Efficient Artificial Nitrogen Fixation

Sudip Biswas

Sudip Biswas

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

These authors contributed equally

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Jingwen Zhou

Jingwen Zhou

Institute of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

These authors contributed equally

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Xue-Lu Chen

Xue-Lu Chen

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Chen Chi

Chen Chi

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Yi-An Pan

Yi-An Pan

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Peixin Cui

Peixin Cui

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 China

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Jian Li

Corresponding Author

Jian Li

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Chungen Liu

Corresponding Author

Chungen Liu

Institute of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Xing-Hua Xia

Corresponding Author

Xing-Hua Xia

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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First published: 11 April 2024
Citations: 10

Graphical Abstract

A metal-metal bonded dual-atomic Al−Al site was designed and synthesized on a nitrogen-doped porous carbon matrix for the electrocatalytic conversion of N2 to NH3. The catalyst with the bonded Al2-pair site exhibited high Faradaic efficiency and selective NH3 generation. The mechanism follows a six-electrons transfer pathway for the selective generation of NH3, as revealed by operando surface-enhanced IR spectroelectrochemistry.

Abstract

Synthesis of ammonia by electrochemical nitrogen reduction reaction (NRR) is a promising alternative to the Haber–Bosch process. However, it is commonly obstructed by the high activation energy. Here, we report the design and synthesis of an Al−Al bonded dual atomic catalyst stabilized within an amorphous nitrogen-doped porous carbon matrix (Al2NC) with high NRR performance. The dual atomic Al2-sites act synergistically to catalyze the complex multiple steps of NRR through adsorption and activation, enhancing the proton-coupled electron transfer. This Al2NC catalyst exhibits a high Faradaic efficiency of 16.56±0.3 % with a yield rate of 29.22±1.2 μg h−1 mgcat−1. The dual atomic Al2NC catalyst shows long-term repeatable, and stable NRR performance. This work presents an insight into the identification of synergistic dual atomic catalytic site and mechanistic pathway for the electrochemical conversion of N2 to NH3.

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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