New analysis shows ion slowdown in fuel cell material

Dislocations in oxides seen as promising electrolytes create a “traffic jam” for charged ions. Learn more from the MIT News Office.

Simulations show the effects of dislocations in cerium dioxide on the redistribution of differently sized dopant atoms, replacing a cerium atom in the crystal lattice. The results reveal different amounts of segregation around the dislocation caused by the differently sized elements. The sizes of the other atoms are compared to a cesium atom (left, in black). The white dashed line shows the plane of the dislocation caused by strain. Image courtesy of the researchers

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