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Platinum-Tellurium Heterojunction Nanosheet Assemblies for Efficient Direct Formic Acid Electrooxidation Catalysis
Chengyuan Dong1, Biao Zhang1, Huijun Song2
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS Nano
|March 29, 2024
Summary
Researchers developed novel 2D platinum-tellurium heterojunction nanosheet assemblies (Pt-PtTe2 HJNSAs) for enhanced catalysis. These materials exhibit superior formic acid oxidation reaction (FAOR) activity and stability, significantly outperforming commercial catalysts.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Two-dimensional (2D) heterojunction nanomaterials possess unique electronic structures beneficial for catalysis.
- Synthesizing uniform 2D platinum (Pt)-based nanomaterials with controlled crystalline phases is challenging.
- Developing efficient catalysts for reactions like formic acid oxidation is crucial for fuel cell technology.
Purpose of the Study:
- To synthesize advanced 2D platinum-tellurium heterojunction nanosheet assemblies (Pt-PtTe2 HJNSAs).
- To investigate the catalytic performance of these novel heterostructures for the formic acid oxidation reaction (FAOR).
- To understand the structure-property relationships governing their enhanced catalytic activity.
Main Methods:
- Synthesis of 2D Pt-PtTe2 HJNSAs integrating trigonal PtTe2 (t-PtTe2) and cubic Pt (c-Pt) phases.
- Electrocatalytic testing for FAOR activity and stability.
- Characterization using aberration-corrected high-angle annular dark field scanning transmission electron microscopy (AC-HAADF-STEM).
- Theoretical analysis using density functional theory (DFT) calculations.
Main Results:
- Successful synthesis of Pt-PtTe2 HJNSAs with integrated t-PtTe2 and c-Pt phases.
- Achieved exceptional FAOR specific activity (8.4 mA cm-2) and mass activity (6.1 A mgPt-1), significantly exceeding commercial Pt/C.
- Demonstrated excellent stability and CO tolerance attributed to favorable electronic structure and dehydrogenation pathways.
- AC-HAADF-STEM confirmed a well-ordered atomic arrangement and coherent intergrowth structure.
Conclusions:
- The developed 2D Pt-PtTe2 HJNSAs offer a promising platform for high-performance electrocatalysis.
- The heterojunction design facilitates efficient electron transport and optimizes surface electronic properties.
- This study provides a pathway for designing advanced Pt-based nanomaterials for fuel cell applications and beyond.
