Volume 63, Issue 2 e202314408
Research Article

Defects-Induced Single-Atom Anchoring on Metal–Organic Frameworks for High-Efficiency Photocatalytic Nitrogen Reduction

Guangmin Ren

Guangmin Ren

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Jianyong Zhao

Jianyong Zhao

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Zehui Zhao

Zehui Zhao

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Zizhen Li

Zizhen Li

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Liang Wang

Liang Wang

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Zisheng Zhang

Zisheng Zhang

Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, Ottawa, Ontario, K1N6N5 Canada

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Chunhu Li

Chunhu Li

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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Xiangchao Meng

Corresponding Author

Xiangchao Meng

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100 China

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First published: 15 November 2023
Citations: 97

Graphical Abstract

A photochemical strategy was applied to fabricate the defects on MOFs. And the defects further induced the anchoring of Ru single atoms. The photocatalytic activity in N2 reduction to produce ammonia has been greatly improved to 53.28 μmol g−1 h−1 on Ru1/d-UiO-66 with an apparent quantum efficiency of 0.34 % at 300 nm and 0.04 % at 420 nm.

Abstract

Aiming to improve the photocatalytic activity in N2 fixation to produce ammonia, herein, we proposed a photochemical strategy to fabricate defects, and further deposition of Ru single atoms onto UiO-66 (Zr) framework. Electron-metal-support interactions (EMSI) were built between Ru single atoms and the support via a covalently bonding. EMSI were capable of accelerating charge transfer between Ru SAs and UiO-66, which was favorable for highly-efficiently photocatalytic activity. The photocatalytic production rate of ammonia improved from 4.57 μmol g−1 h−1 to 16.28 μmol g−1 h−1 with the fabrication of defects onto UiO-66, and further to 53.28 μmol g−1 h−1 with Ru-single atoms loading. From the DFT results, it was found that d-orbital electrons of Ru were donated to N2 π✶-antibonding orbital, facilitating the activation of the N≡N triple bond. A distal reaction pathway was probably occurred for the photocatalytic N2 reduction to ammonia on Ru1/d-UiO-66 (single Ru sites decorated onto the nodes of defective UiO-66), and the first step of hydrogenation of N2 was the reaction determination step. This work shed a light on improving the photocatalytic activity via feasibly anchoring single atoms on MOF, and provided more evidences to understand the reaction mechanism in photocatalytic reduction of N2.

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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