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Structural Framework-Guided Universal Design of High-Entropy Compounds for Efficient Energy Catalysis
1School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin300350, P. R. China.
Journal of the American Chemical Society
|December 26, 2022
Summary
Researchers developed a novel strategy for creating stable high-entropy compounds by using bimetallic sites to stabilize diverse elements. This approach enables the synthesis of complex materials like high-entropy perovskite hydroxides (HEPHs) with potential for electrocatalysis.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- High-entropy compounds (HECs) offer unique properties from multiple elements but face synthesis and stability challenges.
- The complexity of multicomponent mixing hinders the universal design of stable HECs with diverse compositions and structures.
Purpose of the Study:
- To propose a general design strategy for achieving stability and synthesis of high-entropy compounds.
- To demonstrate the applicability of this strategy across various compound families.
Main Methods:
- A design strategy utilizing bimetallic sites within compound frameworks to stabilize additional elements.
- Synthesis of several typical metal compounds with bimetallic sites, including perovskite hydroxides, layered double hydroxides, spinel sulfides, perovskite fluorides, and spinel oxides.
- Characterization of synthesized high-entropy compounds, focusing on high-entropy perovskite hydroxides (HEPHs).
Main Results:
- Successful synthesis of various high-entropy compounds using the proposed bimetallic site stabilization strategy.
- Demonstration of HEPHs synthesized with a wide range of components, including septenary compositions.
- Observed significant oxygen evolution activity in the synthesized HEPHs.
Conclusions:
- The proposed design strategy provides a general platform for developing stable high-entropy compounds.
- This approach facilitates the creation of novel high-entropy compound systems with significant potential for applications, particularly in electrocatalysis.
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