Highly Selective TiN-Supported Highly Dispersed Pt Catalyst: Ultra Active toward Hydrogen Oxidation and Inactive toward Oxygen Reduction
| Autor: | Sanying Hou, Shijun Liao, Haibo Tang, Junming Luo, Li Du, Xiuhua Li, Xinlong Tian |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science chemistry.chemical_element 02 engineering and technology Electrolyte Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Anode chemistry Chemical engineering General Materials Science 0210 nano-technology Tin Platinum Selectivity Dissolution |
| Zdroj: | ACS Applied Materials & Interfaces. 10:3530-3537 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.7b15159 |
| Popis: | The severe dissolution of the cathode catalyst, caused by an undesired oxygen reduction reaction at the anode during startup and shutdown, is a fatal challenge to practical applications of polymer electrolyte membrane fuel cells. To address this important issue, according to the distinct structure-sensitivity between the σ-type bond in H2 and the π-type bond in O2, we design a HD-Pt/TiN material by highly dispersing Pt on the TiN surface to inhibit the unwanted oxygen reduction reaction. The highly dispersed Pt/TiN catalyst exhibits excellent selectivity toward hydrogen oxidation and oxygen reduction reactions. With a Pt loading of 0.88 wt %, our catalyst shows excellent hydrogen oxidation reaction activity, close to that of commercial 20 wt % Pt/C catalyst, and much lower oxygen reduction reaction activity than the commercial 20 wt % Pt/C catalyst. The lack of well-ordered Pt facets is responsible for the excellent selectivity of the HD-Pt/TiN materials toward hydrogen oxidation and oxygen reduction reac... |
| Databáze: | OpenAIRE |
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