Prussian white (PW) also referred to as Berlin White (BW) or Everett’s Salt (ES), is the totally reduced and sodiated form of the pigment known as Prussian Blue. The basic building blocks of Prussian White are sodium, iron, carbon, and nitrogen. It is the hexacyanoferrate based sodium rich iron analogue (Na2Fe[Fe(CN)6]) used as a positive electrode material in sodium-ion batteries.
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Prussian White (PW) cathode materials have been shown to have an extremely high theoretical capacity of 170 mAh g−1, an improved high rate performance at normal temperatures, and insignificant fluctuations in volume after being cycled. The plentiful and massive interstitial sodium (Na+) ion storage sites found in PW are able to efficiently decrease the stress and strain generated by the Na+ deintercalation/intercalation process, which ultimately results in a stable host structure even after lengthy cycling.
In addition, the presence of three-dimensional (3D) ion transport routes, a weak interaction between Na+ and the host structure, as well as open and stiff frameworks, ensures a rapid kinetics of ion transfer even at subzero temperatures.
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