Study of IrxRu1−xO2 oxides as anodic electrocatalysts for solid polymer electrolyte water electrolysis

Investigations on degradation of the long-term proton exchange membrane water electrolysis stack

“…Moreover, the arc diameter of the cell using MEA-7800 represents charge transfer resistance R ct [18], which is also bigger than that of MEA-0 and MEA-7800 Renewed. The R U and R ct can be obtained through simulation with R U (R 1 Q 1 ) (R ct Q dl ) equivalent circuit [19] and listed in Table 1. As shown in Table 1, both R U and R ct of MEA-7800 (Fig.…”

Screening Bifunctional Pt Based NSTF Catalysts for Durability with the Rotating Disk Electrode: The Effect of Ir and Ru

“…It is well know Ru rapidly dissolves to soluble RuO 4 above 1.4 V RHE 39 and that Ru that can be stabilized in Ru-Ir mixtures to yield a more active catalyst than Ir alone. [8][9][10][11][12][13][14] For the following discussion, let it be assumed that the Ir overlayer has particle-like morphology, and particle size equivalent increases with Ir loading. If Ru mixes well with the Ir overlayer, and as a result yields a bigger particle size equivalent for the discontinuous OER catalyst layer, Ru should have a positive effect on durability.…”

“…Figure 1 shows the deposition scheme. It should be stated that the Ir and/or Ru on Pt catalyst material was not deposited as films, as Figure 1 may seem to suggest, but more akin to nanoparticles because of the high roughness factor (10)(11)(12)(13)(14)(15) 21 of NSTF.…”

“…Ru is thus often mixed with Ir to balance the activity, stability and cost properties of an OER-in-acid catalyst. [8][9][10][11][12][13][14] Therefore the addition of Ru to Ir is performed in this study with the hope of finding similarly durable catalysts with lower Ir loadings. Further motivation to include Ru in this study is the strong possibility that the NSTF support has a stabilizing effect on Ru.…”

The influence of sodium ion on the solid polymer electrolyte water electrolysis

“…Fig.3 shows the effects of 0.05 mol L À1 sodium sulfate in anode poisoning for different cathode catalysts. The cell voltages increase by about 0.730 V. Although RuO 2 hydrogen evolution catalyst is insensitive to poisoning by metal ions and suppresses metal ion UPD [16,24], it does not improve the cell performance when sodium ion poisoning. The possible reason is that sodium ion has very negative Nernst potential and can not be reduced at the cathode or precipitate as hydroxides.…”