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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
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Polyoxometalate-based complex@graphene composite electrodes for efficient nitrate reduction to ammonia.

Nan Zhao1, Xinming Wang1, Shuang Rong2

  • 1Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, P. R. China. wangxinming20@126.com.

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New polyoxometalate (POM)-based catalysts offer a greener alternative for ammonia synthesis. These nickel/cobalt composites on graphene oxide (GO) show high efficiency in converting nitrate to ammonia via electrocatalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Traditional ammonia synthesis is energy-intensive and pollutes the environment.
  • Developing efficient and sustainable electrocatalysts for ammonia production is crucial.
  • Electrocatalytic nitrate reduction to ammonia (e-NO3RR) offers a promising alternative.

Purpose of the Study:

  • To design and synthesize novel polyoxometalate (POM)-based nickel/cobalt metal-organic composite catalysts.
  • To evaluate the electrocatalytic performance of these catalysts for nitrate reduction to ammonia.
  • To investigate the effect of graphene oxide (GO) support on catalyst conductivity and reaction efficiency.

Main Methods:

  • Synthesis of two POM-based catalysts: Ni-P4Mo6/GO and Co-P4Mo6/GO, utilizing {P4Mo6} units, Ni/Co metal nodes, and π-conjugated organic linkers.
  • Electrochemical characterization in acidic and neutral electrolytes to assess ammonia yield and Faradaic efficiency (FE).
  • Loading catalysts onto graphene oxide (GO) to enhance electrical conductivity and reaction contact area.

Main Results:

  • Ni-P4Mo6/GO demonstrated superior performance in acidic media, achieving an ammonia yield of 2.62 mg h⁻¹ mg⁻¹cat. at -0.6 V and 83.9% FE at -0.5 V.
  • Under neutral conditions, Ni-P4Mo6/GO reached an ammonia yield of 11.6 mg h⁻¹ mg⁻¹cat. with 88.4% FE, significantly outperforming Co-P4Mo6/GO.
  • Both catalysts exhibited enhanced performance under neutral conditions, surpassing many existing electrocatalysts for e-NO3RR.

Conclusions:

  • The developed POM-based Ni/Co catalysts supported on GO are highly efficient for electrocatalytic nitrate reduction to ammonia.
  • These catalysts present a viable, greener alternative to traditional ammonia synthesis methods.
  • This study offers a novel strategy for designing advanced electrocatalysts for sustainable ammonia production.