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Structurally Engineered CNT-Confined MnxRu1-xO2 Catalysts for Efficient Acidic Oxygen Evolution at Low Ru Loading
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DOI：10.1039/D5SC04431F.png)
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Abstract
En 中文
Developing acidic oxygen evolution reaction (OER) catalysts with low noble metal loading and high activity remains a critical challenge for advancing proton exchange membrane water electrolyzers. Herein; we report a structurally engineered MnxRu1-xO2 catalysts confined on carbon nanotubes (CNTs); enabling highly dispersed active sites and remarkable catalytic activity at low Ru content. The uniform nanoscale coating of MnxRu1-xO2 along CNT sidewalls promotes Mn-O-Ru interfacial bonding and establishes an electron-bridge for enhances charge transfer. The optimized CNT-(Mn0.75Ru0.25)O2 catalyst delivers an ultra-low overpotential of 120 mV at 10 mA cm⁻2 and an exceptional mass activity of 5549 A gRu-1 at 270 mV—252 times that of commercial RuO2 (22 A gRu-1). Combined X-ray spectroscopy; in-situ Raman; and differential electrochemical mass spectrometry reveal that the electron-rich Ru centers stabilized by Mn-O bridges accelerate charge transfer and suppress Ru dissolution during OER. Moreover; the CNT substrate and Ru incorporation synergistically generate abundant oxygen vacancies; significantly enhancing the catalytic activity through an improved lattice oxygen-mediated mechanism. This work highlights the critical role of CNT confinement and interfacial electronic modulation in decoupling noble metal usage from performance; offering a versatile design strategy for next-generation acidic OER catalysts.
Journal
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7.4
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1.7W
Citations:
9.3W
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