[2E01-08] Vaccuum Science and Technology (VST)

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[2E07] Surface distribution of permeated hydrogen through nickel membrane measured with operando hydrogen microscope

*Akiko N. Itakura¹, Tomoko Kusawake¹, Naoya Miyauchi¹, Taro Yakabe¹, Hajime Yoshida², Teppei Kubota³, Takashi Oyama³, Yasutomo Kobayashi³ (1. National Institute for Materials Science (Japan), 2. National Institute of Advanced Industrial Science and Technology (Japan), 3. Murata Manufacturing Co., Ltd. (Japan))

We are developing materials for hydrogen storage and transport. Improving nickel performance in hydrogen environments requires microstructural control. Our newly developed operando hydrogen microscope can identify local hydrogen desorption and create images of hydrogen on the surface of a material by electron stimulation desorption mechanism (ESD). Nickel was annealed to obtain fine-grained and large-grained microstructures with grain sizes below 50 mm and exceeding 500 mm, respectively. Hydrogen was introduced from the opposite side of the nickel membrane, and the spatial distribution of permeated hydrogen was visualized using ESD mapping. ESD signals were accumulated for 250 h. The measurements revealed that intragranular diffusion was more pronounced than grain-boundary diffusion. Moreover, the observed hydrogen distribution reflected the grain morphology.

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