Prussian
white (PW), due to its low cost, easy synthesis, open
structure, and fast ion extraction/interaction, is introduced to the
electrochromic field. The PW films were successfully grown on indium
tin oxide (ITO) glass by a facial hydrothermal method. Impressively,
the PW film exhibits excellent electrochemical cycling stability without
obvious decay over 10 000 cycles and a high coloration efficiency
of 149.3 cm2 C–1. The film also provides
the large optical transmittance contrast (over 70%) in a wide wavelength
range of 650–800 nm. Furthermore, the PW film shows the rapid
coloration and bleaching response. These results suggest that PW is
a promising practical candidate of high-performance electrochromic
material.
Core-level spectroscopy and valence-band photoelectron spectroscopy were used to study the Ge( lOO)2X 1 surface dosed with 0.5-100 L H 2 0 at 160 K. It is determined that H 2 0 adsorbs molecularly at 160 K and forms ice. The H 2 0 molecules dissociate into Hand OH radicals on the Ge(100)2X 1 surface when the sample is heated to 300 K. A simple adsorption model that accounts for the calculated Hand OH coverages is proposed.
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