Analysis of ferrate(VI) compounds and super-iron Fe(VI) battery cathodes: FTIR, ICP, titrimetric, XRD, UV/VIS, and electrochemical characterization

Licht, Stuart; Naschitz, Vera; Halperin, Leonid; Halperin, Nadezhda; Lin, Lin; Chen, Jianjun; Ghosh, Susanta; Liu, Bing

doi:10.1016/s0378-7753(01)00786-8

Cited by 132 publications

(127 citation statements)

References 12 publications

Supporting

Mentioning

117

Contrasting

Unclassified

Order By: Relevance

“…In this analysis, colloidal ferric oxide interference is minimized by a 385 nm baseline correction (Licht et al, 2001). Other reaction species such as iron(II) and iron(III) phosphate have no interference at 510 nm (Huang et al, 2001).…”

Section: Methodsmentioning

confidence: 99%

A study of the preparation and reactivity of potassium ferrate

2005

View full text Add to dashboard Cite

In the context of water treatment, the ferrate ([FeO 4 ] 2-) ion has long been known for its strong oxidizing power and for producing a coagulant from its reduced form (i.e. Fe(III)). However, it has not been studied extensively owing to difficulties with its preparation and its instability in water. This paper describes an improved procedure for preparing solid phase potassium ferrate of high purity (99%) and with a high yield (50-70%). The characteristics of solid potassium ferrate were investigated and from XRD spectra it was found that samples of the solid have a tetrahedral structure with a space group of D 2h ( Pnma) and a = 7.705 Å, b = 5.863 Å, and c = 10.36 Å. The aqueous stability of potassium ferrate at various pH values and different concentrations was investigated. It was found that potassium ferrate solution had a maximum stability at pH 9-10 and that ferrate solution at low concentration (0.25 mM) was more stable than at high concentration (0.51 mM). The aqueous reaction of ferrate with bisphenol A (BPA), a known endocrine disrupter compound, was also investigated with a molar ratio of Fe(VI):BPA in the range of 1:1-5:1. The optimal pH for BPA degradation was 9.4, and at this pH and a Fe(VI):BPA molar ratio of 5:1, approximately 90% of the BPA was degraded after 60 s.

show abstract

Section: Methodsmentioning

confidence: 99%

A study of the preparation and reactivity of potassium ferrate

2005

View full text Add to dashboard Cite

show abstract

“…Development Reference 1999 introduction of super-iron charge storage & super-iron alkaline battery [5] 2000** introduction of super-iron lithium primary (single discharge) battery [7] 2001 demonstration of the solid state stability of the hexavalent iron [8] 1999-5 chemical syntheses of an array of super-iron salts [5,7,[9][10][11][12][13][14][15][16] 2000-4 inexpensive, electrochemical syntheses of super-iron salts [17][18][19][20][21][22][23][24][25][26] 2003-5** electrolyte optimization for super-iron lithium batteries [27,28] 2003 reversibility of alkaline, nanothick (3 nm) Fe(VI) cathodes [29] 2006 rechargeable alkaline super-iron battery [30] 2006** reversibility of non-aqueous, nanothick (3 nm) Fe(VI) cathodes [31] 2007-8 zirconia encapsulation-stabilization of alkali super-irons [32][33][34][35] 2009** rechargeable super-iron lithium battery, 4 V cathode [6] **=lithium super-iron battery development.…”

Section: Yearmentioning

confidence: 99%

A High Capacity Li-Ion Cathode: The Fe(III/VI) Super-Iron Cathode

Licht

2010

Energies

Self Cite

View full text Add to dashboard Cite

A super-iron Li-ion cathode with a 3-fold higher reversible capacity (a storage capacity of 485 mAh/g) is presented. One of the principle constraints to vehicle electrification is that the Li-ion cathode battery chemistry is massive, and expensive. Demonstrated is a 3 electron storage lithium cathodic chemistry, and a reversible Li super-iron battery, which has a significantly higher capacity than contemporary Li-ion batteries. The super-iron Li-ion cathode consists of the hexavalent iron (Fe(VI)) salt, Na 2 FeO 4 , and is formed from inexpensive and clean materials. The charge storage mechanism is fundamentally different from those of traditional lithium ion intercalation cathodes. Instead, charge storage is based on multi-electron faradaic reduction, which considerably enhances the intrinsic charge storage capacity.

show abstract

“…Several efforts have been made to synthesize the ferrate (VI) solids [7][8][9][10][11][12][13][14]. However, it was all the time difficult to isolate the solid product from each of the resulting solutions and to stabilize it.…”

Section: Introductionmentioning

confidence: 99%