IrxRu1-XO2 Electrocatalysts for PEM Water Electrolysis
Complete physicochemical characterisation of the synthesised materials was performed regarding their structure, morphology, specific surface area as well as surface composition using X-ray Diffraction (XRD), BET analysis, High Resolution Transmission Electron Microscopy (HTTEM) and X-ray Photoelectron Spectroscopy (XPS). The electrochemical performance and stability of the prepared electrocatalysts, casted on glassy carbon (GC), were evaluated with repetitive cyclic voltammetry in a typical three-cell electrode configuration using 0.5 M H2SO4solution. Furthermore, the mixed oxides have been used as anodes in Nafion® based MEAs and evaluated in a PEM electrolysis cell.
The results have shown that the synthesis method leads to the formation of rutile structure oxides with high surface area (90-127 m2/g) and nano-level particle size (5-7 nm). The stability of the mixed oxides during potentiostatic cycling has been proven remarkable, while the best performing MEA with an anode of Ir0.4Ru0.6O2 reached a current density of 320 mA/cm2at 1.7 V.
The work is supported by the European Space Agency (ESA).
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