Unraveling the Mixing Entropy-Activity Relationship in High Entropy Alloy Catalysts: The More, The Better?

The variety of publications reporting high-entropy alloy (HEA) catalysts with exceptional activities creates a survivor bias, implying that the mixing entropy directly increases the activity. However, many screening studies show a different picture. In a multielement composition-activity space, often a low to medium entropic 2- or 3-element composition emerges as the most active catalyst. In this work, we investigate the relationship between the complexity of an alloy, which can be expressed in mixing entropy, and its maximum possible activity using theory and statistical modeling. Based on our analysis, we propose a hypothesis for the surface complexity-activity relationship of HEA catalysts. Namely, the…

• DG
  Danmarks Grundforskningsfond

  Award: DNRF149