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Hace 5 días · Oxide ceramics are considered promising candidates as solid electrolytes (SEs) for sodium metal batteries. However, the high sintering temperature induced boundaries and pores between angular grains lead to high grain boundary resistance and pathways for dendrite growth. Herein, we report a grain boundary modification strategy, which in situ generates an amorphous matrix among Na5SmSi4O12 ...
Hace 3 días · Abstract：The power conversion efficiency and stability of polycrystalline perovskite solar cells are compromised by grain-boundary-dominated ion migration. Herein, the grain boundaries of CH3NH3PbI3
Hace 5 días · Abstract: Determining the full five-parameter grain boundary characteristics from experiments is essential for understanding grain boundaries impact on material properties, improving related models, and designing advanced alloys. However, achieving this is generally challenging, in particular at nanoscale, due to their 3D nature. In our study, we successfully determined the grain boundary ...
Hace 5 días · Figure 4. Rotation to coalescence of a single grain during coarsening. (a) Microscopy images of a small grain A, which rotates to coalesce with a larger adjacent grain B. (b) Particle coordinates from panel (a) colored by orientation (see key) with grain boundaries drawn in black.
Hace 5 días · As sulfur-based gas permeates through the grain boundaries, it is expected to interact with Li-ions. Analysis via EELS failed to detect elements like Ni, Mn, Co, and P within the grain, ruling out the formation of transition metal sulfides or phosphorous sulfides. Instead, the formation of lithiated sulfide is anticipated.
Hace 5 días · Lewis base molecules bind the undercoordinated lead atoms at interfaces and grain boundaries, leading to the high efficiency and stability of flexible perovskite solar cells (PSCs). We demonstrated a highly efficient, stable, and flexible PSC via interface passivation using a Lewis base of tri(o-tolyl)phosphine (TTP). It not only induced an ...
Hace 1 día · Zhao et al. found that the AlN particles pinning at the grain boundaries refined the β-Mg 17 Al 12 phase, significantly improving its distribution. The reduction in the grain and second phase sizes, as well as a more uniform distribution of the second phases, are beneficial for enhancing the mechanical properties of the composite.
