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Structural Analysis of K4Fe(CN)6·3H2O, K3Fe(CN)6 and Prussian Blue

Journal Article · · ECS Journal of Solid State Science and Technology
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [3]
  1. Naval Surface Warfare Center, Carderock Division, West Bethesda, MD (United States)
  2. University of Miami, Coral Gables, FL (United States)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
XRD and XAS were used to characterize the bulk structure, while XPS was used to characterize the surface structure, of commercially obtained nominally K4Fe(CN)6·3H2O, K3Fe(CN)6 and our synthesized Prussian Blue (PB) material. K4Fe(CN)6·3H2O was found to consist of a fully hydrated phase, which crystallizes in the monoclinic form and a less hydrated or anhydrous phase which crystallizes in the orthorhombic form. K3Fe(CN)6 was found to consist of the well-established orthorhombic form rather than the monoclinic form. The structure of our synthesized Prussian Blue (PB) was found to be consistent with that reported for (KOH)0.7Fe(III)1.33Fe(II)(CN)6·4.0H2O which crystallizes in the cubic form. XPS and XAS confirmed the presence of ferrous Fe(II) at the surface and bulk levels in K4Fe(CN)6·xH2O. However, XPS revealed the presence of Fe(II) (~30%) and Fe(III) (~70%) in the surface region of K3Fe(CN)6 while XAS confirmed the presence of mostly Fe(III) at the bulk level. Both XPS and XANES confirmed the presence of Fe(II) and Fe(III) in the surface and bulk regions of PB. We report that this ex situ XAS study will be used to support the analysis of an in situ XAS data collected on a PB containing supercapacitor to understand the mechanistic origin of pseudocapacitance in these devices.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Office of Naval Research (ONR); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1842289
Alternate ID(s):
OSTI ID: 1824687
OSTI ID: 1825770
Journal Information:
ECS Journal of Solid State Science and Technology, Journal Name: ECS Journal of Solid State Science and Technology Journal Issue: 10 Vol. 10; ISSN 2162-8769
Publisher:
Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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