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Trace Ru-Doped PtCuRu@PtRu Core-Shell Electrocatalyst for CO-Resilient Methanol Oxidation
Tianrui Xue1, Shiyue Xing1, Zhongliang Liu1
1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology, Shanghai, P. R. China.
Abstract:
To overcome the limited water dissociation capability and transition metal dissolution in Pt-based binary alloys during methanol oxidation reaction (MOR), a PtCuRu-0.05@PtRu core-shell electrocatalyst with trace Ru doping was synthesized via liquid-phase reduction followed by in-situ electrochemical dealloying. The design leverages three synergistic mechanisms: oxophilic Ru sites in the Pt-rich shell facilitate water dissociation to generate *OH for efficient *CO oxidation; lattice mismatch between the ternary PtCuRu core and trace Ru-doped Pt-rich shell induces compressive strain, downshifting the Pt d-band center to weaken *CO adsorption; and the Pt-rich shell acts as a diffusion barrier suppressing Cu dissolution. As a result, PtCuRu-0.05@PtRu delivers the highest mass activity of 1.208 A mgPt -1, surpassing PtCu@Pt and commercial Pt/C samples. Moreover, PtCuRu-0.05@PtRu exhibits superior durability, maintaining the highest current density during 3600 s chronoamperometry and showing only 3.31% activity decay after five consecutive stability tests (18,000 s), with preserved structural integrity. This work provides a viable strategy for simultaneously enhancing MOR activity and durability via synergistic composition and structure engineering.
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