X-ray spectroscopic analysis of stochastic, periodic precipitation in Co–Fe-Based Prussian blue analogues

2018 ◽  
Vol 33 (6) ◽  
pp. 957-966 ◽  
Author(s):  
Hisashi Hayashi ◽  
Yui Sato ◽  
Hitoshi Abe
Keyword(s):  
Prussian Blue ◽  
Water Glass ◽  
Spectroscopic Analysis ◽  
X Ray ◽  
Periodic Precipitation ◽  
Prussian Blue Analogues

Stochastic, ripening-induced, periodic precipitation of Co–Fe-based Prussian blue analogues in water-glass gels was analyzed by XRF and XANES spectroscopies.

In situ XRF analysis of Cs adsorption by the precipitation bands of Prussian blue analogues formed in agarose gels

2019 ◽  
Vol 34 (5) ◽  
pp. 979-985 ◽  
Author(s):  
Hisashi Hayashi ◽  
Yui Sato ◽  
Saya Aoki ◽  
Mao Takaishi
Keyword(s):  
Prussian Blue ◽  
Agarose Gel ◽  
X Ray ◽  
Agarose Gels ◽  
Xrf Analysis ◽  
Prussian Blue Analogues ◽  
Xrf Spectroscopy

The measurement of Cs adsorption by the precipitation bands of Mn-based Prussian blue analogues (PBAs), Co-based PBAs, and Prussian blue (PB), which were spontaneously formed in agarose gel, was carried out using in situ X-ray fluorescence (XRF) spectroscopy.

scholarly journals Synchrotron-Radiation X-Ray Investigation of Li+/Na+Intercalation into Prussian Blue Analogues

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
Yutaka Moritomo ◽  
Masamitsu Takachi ◽  
Yutaro Kurihara ◽  
Tomoyuki Matsuda
Keyword(s):  
Synchrotron Radiation ◽  
Prussian Blue ◽  
Cathode Materials ◽  
Structural Investigation ◽  
Lithium Ion ◽  
X Ray ◽  
Prussian Blue Analogues ◽  
The Stability ◽  
X Ray Absorption ◽  
Discharge Curves

Prussian blue analogies (PBAs) are promising cathode materials for lithium ion (LIB) and sodium ion (SIB) secondary batteries, reflecting their covalent and nanoporous host structure. With use of synchrotron-radiation (SR) X-ray source, we investigated the structural and electronic responses of the host framework of PBAs against Li+and Na+intercalation by means of the X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS). The structural investigation reveals a robust nature of the host framework against Li+and Na+intercalation, which is advantageous for the stability and lifetime of the batteries. The spectroscopic investigation identifies the redox processes in respective plateaus in the discharge curves. We further compare these characteristics with those of the conventional cathode materials, such as, LiCoO2, LiFePO4, and LiMn2O4.

scholarly journals Metal-to-ligand and ligand-to-metal charge transfer in thin films of Prussian blue analogues investigated by X-ray absorption spectroscopy

2008 ◽  
Vol 10 (38) ◽  
pp. 5882 ◽  
Author(s):  
Sébastien Bonhommeau ◽  
Niko Pontius ◽  
Saioa Cobo ◽  
Lionel Salmon ◽  
Frank M. F. de Groot ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Prussian Blue ◽  
Absorption Spectroscopy ◽  
Metal Charge ◽  
X Ray ◽  
Prussian Blue Analogues ◽  
X Ray Absorption ◽  
Metal Charge Transfer

scholarly journals Detailing the Self-Discharge of a Cathode Based on a Prussian Blue Analogue

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 4027
Author(s):  
Elisa Musella ◽  
Angelo Mullaliu ◽  
Thomas Ruf ◽  
Paula Huth ◽  
Domenica Tonelli ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Photoelectron Spectroscopy ◽  
Degradation Products ◽  
Redox System ◽  
The Self ◽  
Chemical Information ◽  
Discharge Process ◽  
X Ray ◽  
Electrode Surfaces ◽  
Prussian Blue Analogues

Prussian Blue analogues (PBAs) are a promising class of electrode active materials for batteries. Among them, copper nitroprusside, Cu[Fe(CN)5NO], has recently been investigated for its peculiar redox system, which also involves the nitrosyl ligand as a non-innocent ligand, in addition to the electroactivity of the metal sites, Cu and Fe. This paper studies the dynamics of the electrode, employing surface sensitive X-ray Photoelectron spectroscopy (XPS) and bulk sensitive X-ray absorption spectroscopy (XAS) techniques. XPS provided chemical information on the layers formed on electrode surfaces following the self-discharge process of the cathode material in the presence of the electrolyte. These layers consist mainly of electrolyte degradation products, such as LiF, LixPOyFz and LixPFy. Moreover, as evidenced by XAS and XPS, reduction at both metal sites takes place in the bulk and in the surface of the material, clearly evidencing that a self-discharge process is occurring. We observed faster processes and higher amounts of reduced species and decomposition products in the case of samples with a higher amount of coordination water.

X-ray spectroscopic analysis of Liesegang patterns in Mn–Fe-based Prussian blue analogs

2016 ◽  
Vol 31 (8) ◽  
pp. 1658-1672 ◽  
Author(s):  
Hisashi Hayashi ◽  
Hitoshi Abe
Keyword(s):  
Prussian Blue ◽  
Spectroscopic Analysis ◽  
Time Resolved ◽  
Edge Structure ◽  
X Ray ◽  
Prussian Blue Analogs ◽  
X Ray Absorption

We performed time-resolved X-ray fluorescence (XRF) and position-dependent X-ray absorption near-edge structure (XANES) measurements on Liesegang patterns in Mn–Fe-based Prussian blue analogs.

scholarly journals Comparing electrochemical analysis and particle induced X-ray emission measurements of Prussian Blue Analogue deposits

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Scott D. Joffre ◽  
Paul A. DeYoung ◽  
Jennifer R. Hampton
Keyword(s):  
Prussian Blue ◽  
Electrochemical Measurement ◽  
Electrochemical Analysis ◽  
Charge Storage ◽  
Nickel Hexacyanoferrate ◽  
Prussian Blue Analogue ◽  
X Ray ◽  
Prussian Blue Analogues ◽  
Major Interest ◽  
Electrochemically Active

AbstractPrussian Blue Analogues are of major interest for their use in alternative battery technologies due to their charge storing ability with a long life cycle. In this work the Prussian Blue Analogue nickel hexacyanoferrate (Ni-HCF) was produced using an all electrochemical method. Creating charge storing materials with electrochemical processes provides a new approach to the development of battery-like materials. These methods have not been commonly employed because the charge storing material yield is not directly known. The charge storage of the Ni-HCF was characterized with two different methods which provided a measure of the electrochemically active Fe present. These were then compared with the Particle Induced X-ray Emission (PIXE) method which measured the total amount of Fe present. By comparing the electrochemical measurement of active Fe to the total Fe as measured by PIXE, the percentage of material that is active in the charge storage was determined. This enables an independent calculation of the specific charge capacity of the material for comparison to other battery technologies.

scholarly journals A Reaction–Diffusion–Reaction System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues

2021 ◽  
Vol 11 (11) ◽  
pp. 5000
Author(s):  
Hisashi Hayashi ◽  
Tomoko Suzuki
Keyword(s):  
Prussian Blue ◽  
Reaction System ◽  
Reaction Diffusion ◽  
Diffusion Reaction ◽  
Ion Diffusion ◽  
Periodic Precipitation ◽  
Precipitation Patterns ◽  
Prussian Blue Analogues ◽  
Potential Applications ◽  
Alternating Voltage

We propose a simple and novel system to form precipitation patterns of Cu-Fe-based Prussian blue analogues (Cu-Fe PBA) in agarose gel through coupled electrochemical reactions, reactant ion diffusion influenced by electric field, and precipitation reactions. The spatiotemporal evolution, spatial distribution, and crystallite morphologies of the precipitates were investigated by visual inspection, Fe Kα intensity distribution measurements, and optical and scanning electron microscope observations. The observed precipitation patterns and their evolution depended on the applied voltage. Multicolored periodic precipitation bands were stochastically formed under cyclic alternating voltage (4 V for 1 h and then 1 V for 4 h per cycle). The distances between adjacent bands were randomly distributed (0.30 ± 0.25 mm). The sizes and shapes of the crystallites generated in the gel were position-dependent. Cubic but fairly irregular crystallites (0.1–0.8 μm) were formed in the periodic bands, whereas definitely cube-shaped crystallites (1–3 μm) appeared close to the anode. These cube-like reddish–brown crystallites were assigned to Cu-FeII PBA. In some periodic bands, plate-like blue crystallites (assigned to Cu(OH)2) were also present. Future issues for potential applications of the observed periodic banding for selective preparation of Cu-Fe PBA crystallites were discussed.

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