Oxygen Electrocatalysis at MnIII–Ox–C Hybrid Heterojunction: An Electronic Synergy or Cooperative Catalysis?
| Autor: | Rui Huang, Xin Tan, Ling-Yun Jang, Ian R. Gentle, Xing Huang, Dang Sheng Su, Peter Kappen, Hassan A. Tahini, Dawei Wang, Sean C. Smith, Kuang-Hsu Wu, Wei Qi, Rose Amal, Yuxiao Ding |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
chemistry.chemical_element Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Oxygen 0104 chemical sciences Catalysis Metal chemistry Chemical engineering Transmission electron microscopy visual_art visual_art.visual_art_medium General Materials Science Absorption (chemistry) 0210 nano-technology Carbon |
| Zdroj: | ACS Applied Materials & Interfaces. 11:706-713 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b16325 |
| Popis: | The interface at the metal oxide-carbon hybrid heterojunction is the source to the well-known "synergistic effect" in catalysis. Understanding the structure-function properties is key for designing more advanced catalyst-support systems. Using a model MnIII-O x single-layer catalyst on carbon, we herein report a full elucidation to the catalytic synergism at the hybrid heterojunction in the oxygen reduction reaction (ORR). The successful fabrication of the single-layer catalyst from bottom-up is fully characterized by the X-ray absorption fine structure and high-resolution transmission electron microscopy. For oxygen electrocatalysis over this model hybrid heterostructure, our results, from both theory and experiment, show that the synergistic ORR truly undergoes a cooperated two-step electrocatalysis with catalytic promotion (Δ Eonset = 60 mV) near the heterojunction and over the single-layer catalyst through an interfacial electronic interplay, rather than an abstruse transition towards a one-step dissociative pathway. Finally, we report a superior peroxide-reducing activity of 432.5 mA cm-2 mg(M)-1 over the MnIII-O x single-layer. |
| Databáze: | OpenAIRE |
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