Platinum Nanoparticle Inclusion into a Carbonized Polymer of Intrinsic Microporosity: Electrochemical Characteristics of a Catalyst for Electroless Hydrogen Peroxide Production.
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2018
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Abstract
The one-step vacuum carbonization synthesis of a platinum nano-catalyst embedded in a microporous heterocarbon (Pt@cPIM) is demonstrated. A nitrogen-rich polymer of an intrinsic microporosity (PIM) precursor is impregnated with PtCl₆ to give (after vacuum carbonization at 700 °C) a nitrogen-containing heterocarbon with embedded Pt nanoparticles of typically 1⁻4 nm diameter (with some particles up to 20 nm diameter). The Brunauer-Emmett-Teller (BET) surface area of this hybrid material is 518 m² g (with a cumulative pore volume of 1.1 cm³ g) consistent with the surface area of the corresponding platinum-free heterocarbon. In electrochemical experiments, the heterocarbon-embedded nano-platinum is observed as reactive towards hydrogen oxidation, but essentially non-reactive towards bigger molecules during methanol oxidation or during oxygen reduction. Therefore, oxygen reduction under electrochemical conditions is suggested to occur mainly via a 2-electron pathway on the outer carbon shell to give H₂O₂. Kinetic selectivity is confirmed in exploratory catalysis experiments in the presence of H₂ gas (which is oxidized on Pt) and O₂ gas (which is reduced on the heterocarbon surface) to result in the direct formation of H₂O₂.
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| Reference Key |
adamik2018platinumnanomaterials
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| Authors | Adamik, Robert K;Hernández-Ibáñez, Naiara;Iniesta, Jesus;Edwards, Jennifer K;Howe, Alexander G R;Armstrong, Robert D;Taylor, Stuart H;Roldan, Alberto;Rong, Yuanyang;Malpass-Evans, Richard;Carta, Mariolino;McKeown, Neil B;He, Daping;Marken, Frank; |
| Journal | Nanomaterials |
| Year | 2018 |
| DOI |
E542
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| URL | |
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