Volume 136, Issue 41 e202409799
Forschungsartikel

MOF-on-MOF Heterostructured Electrocatalysts for Efficient Nitrate Reduction to Ammonia

Yingying Zou

Yingying Zou

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Yuechen Yan

Yuechen Yan

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Qingsong Xue

Qingsong Xue

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Chaoqi Zhang

Chaoqi Zhang

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Tong Bao

Tong Bao

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Xinchan Zhang

Xinchan Zhang

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Ling Yuan

Ling Yuan

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

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Sicong Qiao

Sicong Qiao

National Synchrotron Radiation Laboratory, Key Laboratory of Precision and Intelligent Chemistry, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029 P. R. China

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Li Song

Li Song

National Synchrotron Radiation Laboratory, Key Laboratory of Precision and Intelligent Chemistry, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029 P. R. China

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Prof. Jin Zou

Prof. Jin Zou

Materials Engineering and Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, Queensland, 4072 Australia

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Prof. Chengzhong Yu

Corresponding Author

Prof. Chengzhong Yu

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072 Australia

State Key Laboratory of Petroleum Molecular and Process Engineering, SKLPMPE, East China Normal University, Shanghai, 200062 P. R. China

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Prof. Chao Liu

Corresponding Author

Prof. Chao Liu

School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241 P. R. China

State Key Laboratory of Petroleum Molecular and Process Engineering, SKLPMPE, East China Normal University, Shanghai, 200062 P. R. China

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First published: 22 July 2024

Abstract

Electrocatalytic nitrate reduction reaction (NO3RR) is an important route for sustainable NH3 synthesis and environmental remediation. Metal–organic frameworks (MOFs) are one family of promising NO3RR electrocatalysts, however, there is plenty of room to improve in their performance, calling for new design principles. Herein, a MOF-on-MOF heterostructured electrocatalyst with interfacial dual active sites and build-in electric field is fabricated for efficient NO3RR to NH3 production. By growing Co-HHTP (HHTP=2,3,6,7,10,11-hexahydroxytriphenylene) nanorods on Ni-BDC (BDC=1,4-benzenedicarboxylate) nanosheets, experimental and theoretical investigations demonstrate the formation of Ni−O−Co bonds at the interface of MOF-on-MOF heterostructure, leading to dual active sites tailed for NO3RR. The Ni sites facilitate the adsorption and activation of NO3, while the Co sites boost the H2O decomposition to supply active hydrogen (Hads) for N-containing intermediates hydrogenation on adjacent Ni sites, cooperatively reducing the energy barriers of NO3RR process. Together with the accelerated electron transfer enabled by built-in electric field, remarkable NO3RR performance is achieved with an NH3 yield rate of 11.46 mg h−1 cm−2 and a Faradaic efficiency of 98.4 %, outperforming most reported MOF-based electrocatalysts. This work provides new insights into the design of high-performance NO3RR electrocatalysts.

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.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.