Using high pressure to investigate the stability of a high entropy wurtzite structured (MnFeCuAgZnCd)S.

High entropy metal chalcogenides are an emergent class of materials that have shown exceptional promise in applications such as energy storage, catalysis, and thermoelectric energy conversion. However, the stability of these materials to factors other than temperature are as yet unknown. Here we set out to assess the stability of the high entropy metal sulfide (MnFeCuAgZnCd)S with high pressure (up to 9 GPa), compared to an enthalpically stabilised AgCuS, and a quasi-stable (MnFeZnCd)S.

Improving CO Oxidation Catalysis Over High Entropy Spinels by Increasing Disorder.

Enhancing the activity and stability of earth-abundant, heterogeneous catalysts remains a key challenge, requiring new materials design strategies to replace platinum-group metals. Herein, it is demonstrated that increasing the configurational disorder of spinel metal oxides (MO, where M is a combination of Cr, Mn, Fe, Co, Ni, Cu, and Zn) leads to significant improvements in carbon monoxide (CO) oxidation performance. A substantial 63% decrease in the T value (temperature to reach 10% CO oxidation) is observed by systematically increasing the number of first-row transition metals within the spinel oxide.