International Journal of Hydrogen Energy· 2026Q1
Directed construction of high-stability PtPd alloys for methanol electrooxidation
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- Q1SCImago
- 2026year
Short summary
Equimolar Pt3Pd3 alloy nanoparticles (1.94 nm) supported on nitrogen-doped carbon (NC) deliver 4892.0 mA mg−1 metal activity for methanol oxidation, retaining 93.3% performance after 500 cycles and avoiding CO poisoning via a formate pathway.
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Key points
- Equimolar Pt3Pd3/NC catalyst exhibits a small particle size of 1.94 nm.
- The catalyst delivers a high mass activity of 4892.0 mA mg−1 metal for methanol oxidation.
- Performance retention is 93.3% after 500 cycles and 2156.4 mA mg−1 metal after 10,800 s.
- In situ surface-enhanced Raman spectroscopy confirms a non-CO (formate) oxidation pathway.
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Abstract
Direct methanol fuel cells (DMFCs) suffer from the high Nost, CO poisoning, and insufficient durability of Pt-based anodes. Alloying Pt with Pd offers a promising route to enhance CO tolerance, yet the stability of PtPd nanoparticles under operating conditions remains a critical challenge. Here, we report composition-controlled Pt x Pd y (x + y = 6) alloy catalysts supported on ZIF-8-derived nitrogen-doped carbon (NC). The equimolar Pt 3 Pd 3 /NC exhibits the smallest particle size (1.94 nm), highest metallic Pt 0 (73.1%) and Pd 0 (79.8%), and strong electron donation from graphitic-N in NC. This catalyst delivers an exceptional mass activity of 4892.0 mA mg −1 metal for methanol oxidation in alkaline media, with 93.3% retention after 500 cycles and a retained current density of 2156.4 mA mg −1 metal after 10,800 s. In situ surface-enhanced Raman spectroscopy reveals a non-CO (formate) pathway, completely avoiding CO poisoning. This work establishes a composition-structure-activity-stability relationship for PtPd alloys and provides a rational design strategy for high-performance, durable DMFC anodes.
The authors' abstract, as published at the source. International Journal of Hydrogen Energy, 2026 · DOI ↗
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