Cu-doped Ag2BiI5 (Cu:SBI) powders with 0–10 mol% doping concentrations were synthesized by a solid-state method in an evacuated glass tube. While doping of Cu did not appreciably modify the crystallographic...
A hierarchical electrode consisting of edge-exposed 1T phase WS2, grown on an array of surface-modified WO3 nanohelixes (NHs), and its enhanced catalytic performance in the hydrogen evolution reaction (HER) are presented.
Although smart windows
have received wide attention as energy-saving
devices, conventional metal-to-insulator materials such as VO2 hinder their commercial usage because of their high transition
temperature and low solar energy modulation. Further development can
be achieved by finding a new material system that can effectively
overcome these limitations. In this study, first-principles density
functional theory calculations are used to investigate the possibility
of exploiting a spin-polarized band gap material for smart window
applications. Halide cuprite perovskites (A2CuX4) were chosen because they have a spin-polarized band gap that can
be tuned by element selection at sites A and X. Our study shows that
the optical transmittance of the insulating phase is increased by
a violation of the selection rule. The spin-polarized band gap is
closely related to the metal-to-insulator transition temperature and
can be modulated by chemical engineering, strain engineering, or both.
Therefore, A2CuX4 is a promising candidate for
smart windows.
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