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Pt Decorated Free-Standing TiO2 Nanotube Arrays: Highly Active and Durable Electrocatalyst for Oxygen Reduction and Methanol Oxidation Reactions

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Free standing TiO2 nanotubes (TiO2-NT) have been synthesized by anodization method and Platinum (Pt) nanoparticles deposited uniformly over TiO2 nanotubes (Pt/TiO2-NT) by chemical impregnation method. Hard X-ray Photoelectron Spectroscopy (HAXPES) and photoluminescence (PL) studies revealed the oxygen defects on the surface of TiO2-NT. The electrochemical performance of Pt/TiO2-NT has been compared with TiO2 nanoparticles supported Pt (Pt/TiO2-NP) and commercial carbon supported Pt (Pt/C). This Pt/TiO2-NT exhibit enhanced electro catalytic activity for both oxygen reduction as well as methanol oxidation reaction (ORR and MOR). The onset potential for ORR shows a considerable shift of 50 mV towards higher side and exhibited 12% increase in specific activity compared with state-of-art Pt/C electrocatalyst. Pt/TiO2-NT also displayed strikingly better mass activity, which is 17-fold higher than that of Pt/C and 3.4–fold more than that of Pt/TiO2-NP. The Accelerated Durability Test (ADT) (durability of catalyst after 10000 cycles) showed that Pt/TiO2-NT retained higher electrochemical surface area compared to other samples: 12% reduction from the initial value for Pt/TiO2-NT; 40% reduction for Pt/TiO2-NP and 76% for Pt/C. Pt/TiO2-NT exhibited long term stability towards ORR compare to both Pt/TiO2-NP and Pt/C. The anode oxidation capability of Pt/TiO2-NT has been tested and it showed enhanced electro catalytic activity for MOR compared to both Pt/TiO2-NP and Pt/C electrocatalysts in terms of activity and CO-poisoning tolerance. The enhanced performance by Pt/TiO2-NT can be imputed to the increased oxygen defects as deciphered from HAXPES, favoring the interface charge transfer between Pt and TiO2-NT. These results together demonstrate Pt/TiO2-NT a candidate catalytic material for cathode as well as anode catalysts in polymer-electrolyte membrane fuel cells (PEMFCs).
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Keywords: Electrocatalyst Support; Methanol Oxidation; Oxygen Reduction; TiO2 Nanotubes

Document Type: Research Article

Affiliations: 1: Centre for Fuel Cell Technology, International Advanced Research Centre for Powder Metallurgy and New Materials, IITM Research Park, Chennai 600113, India 2: Department of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi-shi, Ishikawa-ken 923-1292, Japan 3: National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan 4: Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan 5: Crystal Growth Centre, Anna University, Chennai 600025, Tamil Nadu, India

Publication date: 01 August 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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