Volume 135, Issue 13 e202217635
Zuschrift

Pulsed Electrocatalysis Enabling High Overall Nitrogen Fixation Performance for Atomically Dispersed Fe on TiO2

Mingxia Guo

Mingxia Guo

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

These authors contributed equally to this work.

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Long Fang

Long Fang

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

These authors contributed equally to this work.

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Linlin Zhang

Corresponding Author

Linlin Zhang

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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Mingzhu Li

Mingzhu Li

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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Meiyu Cong

Meiyu Cong

State Key Laboratory of Fine Chemicals, Dalian University of Technology (DUT), Dalian, 116024 Liaoning, P. R. China

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Xiping Guan

Xiping Guan

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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Chuanwei Shi

Chuanwei Shi

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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ChunLei Gu

ChunLei Gu

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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Xia Liu

Corresponding Author

Xia Liu

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

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Yong Wang

Yong Wang

Technische Universität München Department Chemie, Lichtenbergstr. 4, 85748 Garching, Germany

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Xin Ding

Corresponding Author

Xin Ding

College of Chemistry and Chemical Engineering Institution Qingdao University, Qingdao, 266071 Shandong, P. R. China

State Key Laboratory of Fine Chemicals, Dalian University of Technology (DUT), Dalian, 116024 Liaoning, P. R. China

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Dedicated to Professor Licheng Sun on the occasion of his 60th birthday
First published: 06 February 2023

Abstract

Atomically dispersed Fe was designed on TiO2 and explored as a Janus electrocatalyst for both nitrogen oxidation reaction (NOR) and nitrogen reduction reaction (NRR) in a two-electrode system. Pulsed electrochemical catalysis (PE) was firstly involved to inhibit the competitive hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Excitingly, an unanticipated yield of 7055.81 μmol h−1 g−1cat. and 12 868.33 μmol h−1 g−1cat. were obtained for NOR and NRR at 3.5 V, respectively, 44.94 times and 7.8 times increase in FE than the conventional constant voltage electrocatalytic method. Experiments and density functional theory (DFT) calculations revealed that the single-atom Fe could stabilize the oxygen vacancy, lower the energy barrier for the vital rupture of N≡N, and result in enhanced N2 fixation performance. More importantly, PE could effectively enhance the N2 supply by reducing competitive O2 and H2 agglomeration, inhibit the electrocatalytic by-product formation for longstanding *OOH and *H intermediates, and promote the non-electrocatalytic process of N2 activation.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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