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Bimetallic electrocatalysts supported on TiO2 for PEM water electrolyzer

: Fuentes, R.E.; Rau, S.; Smolinka, T.; Weidner, J.W.


Lvov, S. ; Electrochemical Society -ECS-:
Electrochemical Technologies for Hydrogen Production : 217th ECS Meeting, April 25 - April 30, 2010, Vancouver, Canada
Pennington, NJ: ECS, 2010 (ECS transactions 28.2010, Nr.26)
ISBN: 978-1-60768-202-8
ISSN: 1938-5862
Symposium "Electrochemical Technologies for Hydrogen Production" <2010, Vancouver>
Electrochemical Society (Meeting) <217, 2010, Vancouver>
Fraunhofer ISE ()
Energietechnik; Wasserstoff- und Brennstoffzellentechnologie; Wasserstofftechnologie; Wasserstofferzeugung durch Wasserelektrolyse; Wasserstofferzeugung und -speicherung

TiO2 was investigated as a support for several multi-metallic electrocatalysts. Particle size distribution from High Resolution Transmission Electron Microscopy (HRTEM) images showed less than 2 nm average particle sizes. For unsupported Ir-Ru, HRTEM images showed nanoparticles closer than supported Ir-Ru on anatase TiO2 that tend to agglomerate. The electrocatalysts supported on anatase TiO2 showed higher activity towards the oxygen evolution reaction (OER) than those supported on rutile TiO2. Overall, Ir-Ru had the highest current per gram of metal than other metal combinations studied and the optimum ratio was 1:1 Ir:Ru. For the unsupported case, the OER activity was about 41% lower than supported.