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Preparation of MOF-derived molybdenum-carbide-modified PtCu nano-alloy catalysts and their methanol oxidation performance.
- Source :
- New Journal of Chemistry; 5/7/2024, Vol. 48 Issue 17, p7964-7971, 8p
- Publication Year :
- 2024
-
Abstract
- Direct methanol fuel cells (DMFC) are a promising new energy source. However, the lack of high-performance and low-cost methanol oxidation electrocatalysts hinders their commercial application. Firstly, we successfully prepared NENU-5-derived molybdenum carbide material (Cu-MoC) via a co-precipitation and high-temperature carbonization method using a material composed of a copper-based metal–organic skeleton and a molybdenum-based carbide as the main body. Secondly, PtCu nano-alloy catalysts (Pt/Cu-MoC) were prepared using a unique, spontaneous single replacement reaction after metal–organic skeleton (MOF) carbonization. Through the synergistic effect between Pt and Cu and the strong interaction between Mo<subscript>2</subscript>C and PtCu, the electronic structure of the Pt is modified, the energy of the d-band center is reduced, electron exchange is accelerated, and catalytic activity is enhanced. Compared with a commercial Pt/C catalyst in alkaline environments, the Pt<subscript>0.10</subscript>/Cu-MoC catalyst has a better MOR catalytic activity (563.25 mA mg<subscript>Pt</subscript><superscript>−1</superscript>), which is 1.5 times higher than that of commercial Pt/C (376.67 mA mg<subscript>Pt</subscript><superscript>−1</superscript>). The Pt<subscript>0.10</subscript>/Cu-MoC catalyst has an onset potential for CO oxidation that is 16 mV lower than that of commercial Pt/C, indicating better resistance to CO poisoning. Exploring carbon materials derived from MOFs with excellent junction support and using them as carriers to prepare Pt-based catalysts is a practical and feasible approach. It provides a way to develop new Pt-based catalysts that perform efficient MOR. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 48
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 176911858
- Full Text :
- https://doi.org/10.1039/d3nj05511f