Polyoxometalate-derived bimetallic catalysts for the nitrogen reduction reaction

Facile design of low-cost and efficient electrocatalysts is one of the urgent problems to be solved for the electrocatalytic nitrogen reduction reaction (NRR) in a mild environment. Among them, polyoxometalates (POMs) are promising catalysts due to their advantages of abundant transition metal sites...

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Bibliographic Details
Published in:Materials chemistry frontiers 2023-02, Vol.7 (4), p.72-727
Main Authors: Li, Xiaohan, Xue, Cong, Zhou, Xinru, Wei, Yuao, Yu, Yingjie, Fu, Yu, Liu, Wenjing, Lan, Yaqian
Format: Article
Language:English
Subjects:
Ammonia
Bimetals
Catalysts
Chemical reduction
Electrocatalysts
Hydrogen evolution
Iron oxides
Low voltage
Nanocomposites
Particulate composites
Polyoxometallates
Transition metals
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Summary:Facile design of low-cost and efficient electrocatalysts is one of the urgent problems to be solved for the electrocatalytic nitrogen reduction reaction (NRR) in a mild environment. Among them, polyoxometalates (POMs) are promising catalysts due to their advantages of abundant transition metal sites, defined structures, and excellent redox ability. Here, we report the use of a molecule-to-particle strategy for fabricating bimetallic composites as NRR catalysts by utilizing iron-oxo Keggin as the precursor. This bimetallic POM-derived Bi/BiClO/Fe 3 O 4 -600 composite offers ample dispersed metal sites, a porous structure and enhanced conductivity. In addition, the problem of easy hydrogen evolution of Fe species (Fe 3 O 4 ) can be effectively suppressed due to the hydrogen-repellent properties of Bi species (Bi/BiClO). In 0.1 M KOH, Bi/BiClO/Fe 3 O 4 -600 achieved an ammonia yield of 12.82 μg h −1 mg −1 cat . with a faradaic efficiency of 15.22% at low voltage (−0.1 V vs. RHE). The bimetallic composite also demonstrated excellent stability and reproducibility during the whole electrocatalytic NRR process. Such a molecule-to-particle strategy expands possibilities for constructing efficient well-defined metallic nanocomposites for catalytic fields. The application of iron-bridged polyoxometalates has firstly been studied. We propose a new molecule-to-particle synthetic strategy to synthesize a family of bimetallic composites as NRR catalysts with excellent stability and reproducibility.
ISSN:2052-1537
2052-1537
DOI:10.1039/d2qm01131j