Figure 2 (IMAGE)

Tohoku University

Figure 2

Caption

Optical micrographs of the polyaniline layer on pure Ni. Because hydrogen atoms diffuse in pure Ni with time, the flow of hydrogen atoms is visualized as a color change of the polyaniline layer (from purple to white). The color-changed area of the polyaniline layer corresponded to the grain boundaries of pure Ni, meaning that the grain boundaries are the preferential hydrogen diffusion path in pure Ni.

Credit

Acta Materialia

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CC BY

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