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Synthesis of Iridium Nanocatalysts for Water Oxidation in Acid: Effect of the Surfactant
Author(s) -
ArminioRavelo José Alejandro,
Quinson Jonathan,
Pedersen Mads A.,
Kirkensgaard Jacob J. K.,
Arenz Matthias,
EscuderoEscribano María
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201902190
Subject(s) - nanomaterial based catalyst , ethylene glycol , catalysis , nanoparticle , overpotential , pulmonary surfactant , chemical engineering , chemistry , iridium , green chemistry , oxygen evolution , materials science , nanotechnology , inorganic chemistry , organic chemistry , electrochemistry , reaction mechanism , electrode , engineering
Proton exchange membrane water electrolysers are very promising renewable energy conversion devices to produce hydrogen from sustainable feedstocks. These devices are mainly limited by the sluggish kinetics of the oxygen evolution reaction (OER). Therefore, efficient catalysts in acidic media that allow operating at low overpotential are necessary. Ir‐based nanoparticles are both active and stable for the OER. Surfactants are widely used in the preparation of nanoparticle colloids. A severe drawback for catalysis is the need to remove surfactants by typically costly, hazardous, time and/or energy consuming steps. Herein we present a modified approach of the polyol synthesis that consists of a simple surfactant‐free and NaOH‐free synthesis of Ir nanoparticles in ethylene glycol leading to colloidal nanoparticles of ca . 2.5 nm in diameter. The benefits and drawbacks of the surfactant‐free synthesis are illustrated by comparison with commercial Ir black nanoparticles and Ir nanoparticles obtained using surfactant for the electrocatalytic OER in acidic media.