Frontispiz: Using Surface Segregation To Design Stable Ru‐Ir Oxides for the Oxygen Evolution Reaction in Acidic Environments

Abstract

Oberflächenanalyse N. M. Markovic et al. schildern in der Zuschrift auf wie sich die Sauerstoffentwicklungsaktivität von Dimetalloxidmaterialien durch Erzeugung nanosegregierter Domänen der Elemente an der Oberfläche einstellen lässt.

Highly active anode electrocatalysts derived from electrochemical leaching of Ru from metallic Ir 0.7 Ru 0.3 for proton exchange membrane electrolyzers

“…This can be explained by two possible reasons: i) either membrane thinning due to radical attack [36]; or ii) an increase of the number of catalytically active sites. The most plausible interpretation is that the fast dissolution of Ru leads to surface roughening and thus increase in the number of active sites [16,17,37]. For a reliable conclusion on degradation effects of these materials, further investigation is required, which is ongoing.…”

“…In recent years, highly active electrochemically oxidized OER catalysts have been explored [10,14,15]. Markovic and coworkers reported an inverse relationship between activity and stability through investigating monometallic and bimetallic Ir-and Ru-oxides [16,17] Ir showed the highest dissolution rate but not the highest OER activity [19]. The IrRu oxide developed by employing Ir surface segregation showed a four-times improved stability while keeping the same activity as the best commercial Ru-Ir alloy anode catalysts.…”

Boosting H2 Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

“…In general, the overall water electrolysis consists of two half reactions—hydrogen evolution reaction (HER) at the cathode and oxygen evolution reaction (OER) at the anode. Nonetheless, the efficiency of water‐splitting is severely hampered by the OER process due to the high energy barrier for cleavage of OH bond and formation of OO bond . In order to alleviate the above‐mentioned issue, two approaches are generally adopted.…”

Quasi-single-crystalline CoO hexagrams with abundant defects for highly efficient electrocatalytic water oxidation

“…Electrocatalytic water oxidation is a key process in artificial photosynthesis 9–12. Recently, first-row transition metal oxides have been found to be active water oxidation catalysts (WOCs),13–38 but their efficiencies are required to be further improved.…”