Pt Decorated Free-Standing TiO2 Nanotube Arrays: Highly Active and Durable Electrocatalyst for Oxygen Reduction and Methanol Oxidation Reactions
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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Document Type: Research Article
Centre for Fuel Cell Technology, International Advanced Research Centre for Powder Metallurgy and New Materials, IITM Research Park, Chennai 600113, India
Department of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi-shi, Ishikawa-ken 923-1292, Japan
National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
Crystal Growth Centre, Anna University, Chennai 600025, Tamil Nadu, India
August 1, 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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