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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Lewis-Basic Lanthanide Metal-Organic Framework-Derived Versatile Multi-Active-Site Synergistic Catalysts for Oxygen
Zhong Zhang1, Shumei Liu1, Xiaohui Li1
1Key Laboratory of Polyoxometalate Science of the Ministry of Education, College of Chemistry , Northeast Normal University , Jilin 130024 , P. R. China.
ACS Applied Materials & Interfaces
|June 12, 2018
Summary
Researchers developed novel dual lanthanide metal-organic framework catalysts for the oxygen reduction reaction (ORR). These non-platinum catalysts exhibit superior performance to Pt/C, offering a promising alternative for fuel cell applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- The oxygen reduction reaction (ORR) is crucial for fuel cell technology.
- Developing efficient and stable non-precious metal catalysts is essential to replace platinum-based catalysts.
- Lanthanide metal-organic frameworks (MOFs) offer tunable properties for catalytic applications.
Purpose of the Study:
- To synthesize and characterize novel catalysts for ORR based on Ce/La dual lanthanide MOFs.
- To investigate the synergistic effects of oxygen vacancies and Fe-Nx sites on ORR performance.
- To evaluate the potential of these catalysts as alternatives to platinum in fuel cells.
Main Methods:
- Synthesis of Ce/La dual lanthanide MOFs with functional Lewis-basic sites.
- Characterization of the synthesized materials using various analytical techniques.
- Electrochemical evaluation of the catalysts for ORR activity and stability, including half-wave potential and current density measurements.
Main Results:
- A series of excellent ORR catalysts derived from Ce/La dual lanthanide MOFs were successfully synthesized.
- The synergistic effect of high oxygen vacancies (La-embedded CeO2) and Fe-Nx sites, along with a porous structure, resulted in superior ORR performance compared to Pt/C.
- The catalyst achieved a half-wave potential (E1/2) of 0.870 V and a current density (j) of 5.43 mA/cm2.
- The catalysts also demonstrated effectiveness in non-electrocatalytic reactions.
Conclusions:
- The developed Ce/La dual lanthanide MOF catalysts show significant promise as efficient and stable non-platinum electrocatalysts for ORR in fuel cells.
- The strategy of stabilizing oxygen vacancies in a carbon matrix provides a versatile approach for designing catalysts for various applications.
- This research contributes to the advancement of sustainable energy technologies by offering a viable alternative to precious metal catalysts.
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