In Situ Confined Synthesis of Ti4O7 Supported Platinum Electrocatalysts with Enhanced Activity and Stability for the Oxygen Reduction Reaction
作者： Alemayehu Dubale Duma , Yi-Chen Wu , Wei-Nien Su , Chun-Jern Pan , Meng-Che Tsai
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摘要: Herein an in-situ confined synthesis of highly conductive titanium oxide supported Pt catalysts is successfully synthesized. The method involves crystallization and formation TiO2 particles inside the inert silica shell introduced via Hexamethyldisilazane (HMDS). conductivity titania found to be greatly enhanced by increased annealing temperature, whereas inevitable decrease in specific surface area was effectively inhibited derived from HMDS. optimal catalyst (20Pt 850 FHST), exhibited better ORR activity with a maximum current density 0.049 mA cm-2 at 0.9 V (vs. NHE) onset potential 0.86 NHE). prolonged cycling test demonstrated superior stability as compared Pt/C (JM 20). Moreover, X-ray absorption spectroscopy asserts that electron population 5d-orbital, emanating strong metal support interaction, improves electrochemical performance ORR. HMDS-assisted can also extended other catalytic systems.
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