Synthesis and characterization of electrocatalysts for the oxygen evolution in PEM water electrolysis

International audienceIrO$_2$, Ir$_x$Sn$_{(1−x)}$O$_2$ (x = 0.7, 0.5) and Ir$_x$Ru$_{(1−x)}$O$_2$ (x = 0.7, 0.5) electrocatalysts for the oxygen evolution reaction (OER) have been synthesized using the Adams fusion method. The metal oxides were characterized via X-ray diffraction, scanning electron microscopy, inductively coupled plasma–atomic emission spectrometry and nitrogen adsorption–desorption measurements to have information about their crystallographic structure, chemical composition and morphology, respectively. A controlled bulk molar fraction of Ru or Sn was introduced in the IrO2 lattice during the synthesis with no phase separation. The electrocatalytic activity of the synthesized oxides in the OER was studied in liquid electrolyte using porous rotating-disk electrodes, in “half-cell” configuration and in a 5 cm$^2$ proton-exchange membrane water electrolysis cell. An increase of the electrical performance was observed upon Ru insertion and a severe depreciation upon Sn insertion

Electrochemical activity of ruthenium and iridium based catalysts for oxygen evolution reaction

International audiencedecomposition process. The suitable heat treatment of the polymeric precursors allowed to recover metal oxides free from organic carbon, which can be oxidized to carbon dioxide during H2O splitting at elevated potentials. The materials were examined by various physicochemical techniques in order to understand their electrochemical behavior as anodes in a 5 cm(2) single proton exchange membrane water electrolyzer. Although the presence of Ir in the electrocatalyst composition contributes undoubtedly to its stability against ruthenium dissolution and the Faradaic efficiency of the PEM electrolysis cell, its great amount increases the overpotential value. The activity of the home made RuxIr1-xO2 anodes towards the oxygen evolution reaction occurs at ca. 1.5 Vat 25 degrees C

Efficient multi-metallic anode catalysts in a PEM water electrolyzer

International audienceAnode catalysts synthesized by the thermal decomposition method were used for splitting water in PEM electrolysis cells. Although the area resistance of the ternary anode materials increased, the Ti content in the ruthenium and iridium based catalysts have led to an energy consumption of 4.5 kWh/Nm(3)(H-2) at 60 degrees C. The Membrane Electrode Assemblies have given information on the strong dependence of the membrane thickness. The crossover of hydrogen through Nafion (R) 117 is two-fold lower than that measured in the presence of Nafion (R) 115. Life testing was attempted with supplying the electrolyzer by solar power source. Importantly, the proton exchange membrane water electrolyzer (PEMWE) cell has involved a constant cell voltage at 1 A cm(-2) over 800 h durability tests. Copyrigh

Correction: High performing AgNW transparent conducting electrodes with a sheet resistance of 2.5 Ω Sq−1 based upon a roll-to-roll compatible post-processing technique

From Crossref via Jisc Publications RouterArticle version: VoRCorrection for ‘High performing AgNW transparent conducting electrodes with a sheet resistance of 2.5 Ω Sq−1 based upon a roll-to-roll compatible post-processing technique’ by D. Kumar et al., Nanoscale, 2019, DOI: 10.1039/c8nr07974a