The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/aenm.202103090.

No abstract

Microstructured honeycomb catalysts made of rhodium were manufactured and tested in the partial oxidation of methane under different experimental conditions. Even at operating pressures of up to 1.2 MPa with oxygen and up to 2.0 MPa with air, the catalyst was not found to be adversely affected by the reaction heat caused by the total oxidation taking place at the catalyst inlet. The high thermal conductivity of rhodium contributes to a good heat distribution in the flow direction, which is reflected by significantly increased conversions and CO and H 2 selectivities compared to those obtained by using a stack of commercial Pt/Rh gauzes. Increasing catalyst temperatures lead to an increase in the syngas yield. However, the thermodynamic equilibrium of the reaction was not reached in the experiments. Deactivitation of the catalyst was not observed during experimental operation.

Mn‐based hexacyanoferrate (Mn‐HCF) cathodes for Na‐ion batteries usually suffer from poor reversibility and capacity decay resulting from unfavorable phase transitions and structural degradation during cycling. To address this issue, the high‐entropy concept is here applied to Mn‐HCF materials, significantly improving the sodium storage capabilities of this system via a solid‐solution mechanism with minor crystallographic changes upon de‐/sodiation. Complementary structural, electrochemical, and computational characterization methods are used to compare the behavior of high‐, medium‐, and low‐entropy multicomponent Mn‐HCFs resolving, to our knowledge for the first time, the link between configurational entropy/compositional disorder (entropy‐mediated suppression of phase transitions, etc.) and cycling performance/stability in this promising class of next‐generation cathode materials.