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Inside Cover: The Effect of Platinum Nanoparticle Distribution on Oxygen Electroreduction Activity and Selectivity (ChemCatChem 5/2014)
Author(s) -
Fabbri Emiliana,
Taylor Susan,
Rabis Annett,
Levecque Pieter,
Conrad Olaf,
Kötz Rüdiger,
Schmidt Thomas J.
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201490028
Subject(s) - selectivity , platinum , catalysis , nanoparticle , platinum nanoparticles , dispersion (optics) , electrochemistry , chemistry , chemical engineering , inorganic chemistry , materials science , nanotechnology , organic chemistry , electrode , physics , engineering , optics
Dispersion determines platinum activity and selectivity The cover picture shows the change in the Pt specific activity towards the oxygen reduction reaction (ORR) on increasing the electrochemical surface area (ECSA). As E. Fabbri et al. present in their Full Paper on p. 1410 ff. , the transition from extended layers to dispersed nanoparticles leads to an increase in the ECSA but a decrease in the specific ORR activity. The data of specific activity versus the ECSA follow a "master curve" obtained by comparing normalized Pt activities from different studies. The transition from dispersed Pt nanoparticles to extended layers also influences the Pt selectivity. At increased interparticle distance, a significant increase in the H 2 O 2 production is also observed, which indicates the important role of a H 2 O 2 as an intermediate in the ORR reaction on Pt nanoparticles.