Platinized titanium nitride/graphene ternary hybrids for direct methanol fuel cells and titanium nitride/graphene composites for high performance supercapacitors
| Autor: | Yun Suk Huh, Walter Voit, Yuvaraj Haldorai, David Arreaga-Salas, Young-Kyu Han, Choe Sang Rak |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Nanocomposite
Materials science Graphene General Chemical Engineering Oxide chemistry.chemical_element Nanotechnology 02 engineering and technology Nitride 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Titanium nitride 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Electrochemistry 0210 nano-technology Tin Platinum |
| Zdroj: | Electrochimica Acta. 220:465-474 |
| ISSN: | 0013-4686 |
| Popis: | A titanium nitride/reduced graphene oxide nanocomposite (TiN/rGO) was fabricated by a two-step process. The resulting TiN particles had a mean diameter of less than 10 nm and were densely decorated onto the rGO surface. The TiN/rGO composite was used as a support matrix to anchor platinum (Pt) nanoparticles by the polyol method to fabricate a Pt@TiN/rGO ternary hybrid catalyst for methanol oxidation. An increase in the methanol oxidation current density was observed for Pt@TiN/rGO when compared to Pt/rGO and Pt/Vulcan, confirming that the inclusion of TiN along with rGO improved the electrocatalytic activity. The electrochemical surface area was also significantly higher for the Pt@TiN/rGO catalyst (84.5 m2 g−1) than for Pt/rGO (51.7 m2 g−1) and Pt/Vulcan (33.7 m2 g−1), highlighting the importance of TiN. The Pt@TiN/rGO hybrid showed excellent electrocatalytic activity, long-term stability, and better carbon monoxide tolerance for the electrooxidation of methanol when compared to more traditional catalysts, namely Pt/rGO and Pt/Vulcan with same Pt content. Conversely, the TiN/rGO composite (without Pt) showed a higher capacitance of 415 F g‐1 and a long cycle life, with 7.0% capacitance loss after 10,000 cycles. The capacitance was as high as 275 F g‐1 at a current density of 5 A g‐1. |
| Databáze: | OpenAIRE |
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