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A novel high-nuclear cobalt-added polyoxometalate (CoAP) was synthesized, forming the first inorganic chain structure of its kind. This CoAP material demonstrates high efficiency as an electrocatalyst for oxygen evolution reactions.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Polyoxometalates (POMs) are versatile nanoscale metal-oxide clusters with diverse applications.
  • High-nuclearity POMs offer unique structural and electronic properties.
  • Developing efficient electrocatalysts for oxygen evolution reactions (OERs) is crucial for energy conversion technologies.

Purpose of the Study:

  • To synthesize and characterize a novel high-nuclear cobalt-added polyoxometalate (CoAP).
  • To investigate the structural features of the synthesized CoAP, particularly its chain formation.
  • To evaluate the electrocatalytic activity of the CoAP in oxygen evolution reactions (OERs).

Main Methods:

  • Hydrothermal synthesis was employed to prepare the high-nuclear CoAP.
  • Structural characterization was performed using X-ray diffraction and other analytical techniques.
  • Electrochemical methods were utilized to assess the OER performance of the synthesized material.

Main Results:

  • A new high-nuclear CoAP, H14.5K9Na7.5-{[Co8(μ2-OH)(μ3-OH)2(H2O)2(Co(H2O)GeW6O26)(B-α-GeW9O34)2][BO(OH)2][Co12(μ2-OH)(μ3-OH)5(H2O)3(Co(H2O)GeW6O26)(GeW6O26)(B-α-GeW9O34)]}·46H2O (1), was successfully synthesized.
  • Compound 1 features a large Co20 cluster and forms a one-dimensional (1D) inorganic chain structure via CoO6 double bridges, representing the first example of its kind.
  • The synthesized CoAP (1) exhibited efficient electrocatalytic activity in oxygen evolution reactions (OERs).

Conclusions:

  • The successful synthesis of a high-nuclear CoAP-based inorganic chain demonstrates a new structural motif in POM chemistry.
  • This work presents the first example of a 1D chain constructed from high-nuclear CoAP.
  • The material shows promise as an efficient electrocatalyst for oxygen evolution reactions, contributing to advancements in energy storage and conversion.