Extended Data Fig. 2: Morphology and structure characterizations.
From: A room temperature rechargeable all-solid-state hydride ion battery
a,b, SEM images of the ball milled 3CeH3-BaH2 and CeH3 samples, respectively. The 3CeH3-BaH2 sample has a larger particle size, mainly in the rage from 0.5 to 1 μm. The particle size of the ball milled CeH3 is smaller, mainly in 0.2 to 0.6 μm. c, SEM image and corresponding EDS mapping of the 3CeH3-BaH2 sample. The green and red dots represent cerium and barium, respectively. In the micrometre scale, Ba and Ce are uniformly distributed. d, HRTEM images of the 3CeH3-BaH2 sample. Red parallel lines mark the observed crystal plane spacings. These crystal plane data match well with CeH3 crystals \(({Fm}\overline{3}m)\), no crystallines related to BaH2 (Pnma) can been found. e, TEM image of the 3CeH3@BaH2 sample and its corresponding SAED pattern. The diffraction pattern corresponds to the CeH3 crystal, and the innermost ring belongs to the CeH3 (111) plane. No crystalline BaH2 was detectable (if there exists BaH2 crystal in the particle, the innermost ring radius of the diffraction pattern should be much smaller because the crystal plane spacing of orthorhombic BaH2 is larger than 0.32 nm). f, TEM and EELS mapping of the 3CeH3@BaH2 sample. The upper-left image shows the microscopic image of the particle edge, and the green box shows the scanning area. Other figures show the corresponding distribution of Ba and Ce elements. It is evident that particles with core-shell structures are clustered together.
