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oai:riubu.ubu.es:10259/110972025-11-26T01:05:35Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Activity and stability studies of platinized multi-walled carbon nanotubes as fuel cell electrocatalysts Stamatin, Serban N. Borghei, Maryam Dhiman, Rajnish Andersen, Shuang Ma Ruiz Fernández, Virginia Kauppinen, Esko I. Skou, Eivind M. Oxygen reduction reaction Platinum nanoparticles Carbon nanotubes Electrochemical stability Electrocatálisis Electrocatalysis A non-covalent functionalization for multi-walled carbon nanotubes has been used as an alternative to the damaging acid treatment. Platinum nanoparticles with similar particle size distribution have been deposited on the surface modified multi-walled carbon nanotubes. The interaction between platinum nanoparticles and multi-walled carbon nanotubes functionalized with 1-pyrenecarboxylic acid is studied and its electrochemical stability investigated. This study reveals the existence of a platinum-support interaction and leads to three main conclusions. First, the addition of 1-pyrenecarboxylic acid is improving the dispersion of platinum nanoparticles, leading to an improved electrochemical activity towards oxygen reduction reaction. Second, the investigations regarding the electrochemical stability showed that the platinum-support interaction plays an important role in improving the long-term stability by as much as 20%. Third, post-mortem microscopy analysis showed a surprising effect. During the electrochemical stability investigations concerned with carbon corrosion it was found that the multi-walled carbon nanotubes were undergoing severe structural change, transforming finally into carbon spheres. The authors would like to acknowledge Casper F. Nørgaard for his help in improving the overall quality of the manuscript. This work has been supported by the Danish project: PEMFC Catalysts for Boosted Activity and Enhanced Durability (Energinet.dk project no. 2011-1-10669), PEM Durability and Lifetime Part III (Energinet.dk project no. 2013-1-12064), 4M Centre (The Danish Council for Strategic Research project no. 12-132710) Academy of Finland project: Novel carbon material networks as ultrasensitive/efficient platforms for analysis and electroanalysis (No. 130533) and made use of the Aalto University Nanomicroscopy Centre (Aalto-NMC) premises. 2025-11-25T09:34:47Z 2025-11-25T09:34:47Z 2015-01 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 0926-3373 https://hdl.handle.net/10259/11097 10.1016/j.apcatb.2014.07.005 eng Applied Catalysis B: Environmental. 2015, V. 162, p. 289-299 https://doi.org/10.1016/j.apcatb.2014.07.005 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier