Structure and properties of precipitated nickel-iron hydroxides

Demourgues-Guerlou, L.; Delmas, Claude

doi:10.1016/0378-7753(93)80017-j

Cited by 81 publications

(35 citation statements)

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“…This means that both the removal of loosely bonded SOl-and the immediate transformation of the initial carboxylate groups play a crucial role in developing the persistent electrochromism of these films. This is because these groups help in the stabilisation of the ot-Ni(OH)2 phase [23,24] and assist the incorporation of OH-ions from the electrolyte. However, it is not possible to detect from our NGIA FT-IR spectra if the l/-NiOOH and r phases, expected according to the Bode scheme [25], co-exist in these films.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of these modes was detected in previous studies [22] but their role was overlooked mostly because of the inferior quality of the detected spectra. These modes were either attributed to the molecularly adsorbed O2 [22] or to CO32-species incorporated between the slabs by replacing the leaving SO 2-groups in pure turbostratic ot-Ni(OH)2 phase [6,19] or in 0~-Ni(OH)2 containing Fe s+ [23] and Co s+ [24].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Šurca

Orel

Pihlar

1997

J Sol-Gel Sci Technol

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Abstract. Electrochromic hydrated Ni-oxide films were prepared using a dip-coating technique from a nickel sulphate heptahydrate precursor in combination with glycerol, formamide and polyvinyalcohol. In-situ monochromatic (~ = 400 nm) spectroelectrochemical measurements using a potential of -0.4 V to 0.8 V in 0.1M LiOH electrolyte revealed that the electrochromic efficiency was 23.5 cm2/C. The observed colouring/bleaching transmittance of a 100 nm thick film changed during potential cycling (20 cycles) by 45%. Ex-situ FT-IR absorption/reflection measurements performed at near-grazing incidence angle conditions (80 ~ ) confirmed transformation of as-deposited ol-Ni(OH)2 phase to fl-Ni(OH)2 at cathodic (bleached state) and/~-NiOOH at anodic (coloured state) potentials during extended cycling (200 cycles). Clear evidence of the OH-ions insertion and release of SO42-ions from the as-deposited films when soaked (0.5 hour) in 0.1M LiOH are given. These processes are accompanied by the transformation of the residual CO0-groups originating from the peptisation with glacial acetic acid into CO Ispecies residing in the films during extensive potential cycling.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Šurca

Orel

Pihlar

1997

J Sol-Gel Sci Technol

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“…Both IR spectra show similar characteristics. The strong, sharp band centered at 3640 cm −1 corresponds to the O-H vibration, which is typical for ␤-Ni(OH) 2 [36].…”

Section: Xrdmentioning

confidence: 96%

Comparative structural and electrochemical study of high density spherical and non-spherical Ni(OH)2 as cathode materials for Ni–metal hydride batteries

Shangguan

Chang

Tang

et al. 2011

Journal of Power Sources

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:Nickel hydroxide High-density Nickel-metal hydride batteries High-rate discharge Cathode materials a b s t r a c tIn this paper we compare the behavior of non-spherical and spherical ␤-Ni(OH) 2 as cathode materials for Ni-MH batteries in an attempt to explore the effect of microstructure and surface properties of ␤-Ni(OH) 2 on their electrochemical performances. Non-spherical ␤-Ni(OH) 2 powders with a high-density are synthesized using a simple polyacrylamide (PAM) assisted two-step drying method. X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), thermogravimetric/differential thermal analysis (TG-DTA), Brunauer-Emmett-Teller (BET) testing, laser particle size analysis, and tap-density testing are used to characterize the physical properties of the synthesized products. Electrochemical characterization, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and a charge/discharge test, is also performed. The results show that the non-spherical ␤-Ni(OH) 2 materials exhibit an irregular tabular shape and a dense solid structure, which contains many overlapped sheet nano crystalline grains, and have a high density of structural disorder and a large specific surface area. Compared with the spherical ␤-Ni(OH) 2 , the non-spherical ␤-Ni(OH) 2 materials have an enhanced discharge capacity, higher discharge potential plateau and superior cycle stability. This performance improvement can be attributable to a higher proton diffusion coefficient (4.26 × 10 −9 cm 2 s −1 ), better reaction reversibility, and lower electrochemical impedance of the synthesized material.

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“…α-Ni(OH) 2 materials have been prepared with cationic substitutions of the lattice Ni with Al [16,[67][68][69][70][71][72][73][74][75], Mn [76,77], Fe [78,79], Co [14,69,74,75,[80][81][82], Cu [67,83], Zn [65,66,70,84,85], Y [86] and Yb [87]. In some of these examples, the bivalent Ni 2+ cation is replaced with a trivalent species (e.g.…”

Section: (Iii) Ionic Substitution and Foreign Ion Incorporationmentioning

confidence: 99%

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

et al. 2015

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This review article summarizes the last few decades of research on nickel hydroxide, an important material in physics and chemistry, that has many applications in engineering including, significantly, batteries. First, the structures of the two known polymorphs, denoted as α-Ni(OH) 2 and β-Ni(OH) 2 , are described. The various types of disorder, which are frequently present in nickel hydroxide materials, are discussed including hydration, stacking fault disorder, mechanical stresses and the incorporation of ionic impurities. Several related materials are discussed, including intercalated α-derivatives and basic nickel salts. Next, a number of methods to prepare, or synthesize, nickel hydroxides are summarized, including chemical precipitation, electrochemical precipitation, sol-gel synthesis, chemical ageing, hydrothermal and solvothermal synthesis, electrochemical oxidation, microwaveassisted synthesis, and sonochemical methods. Finally, the known physical properties of the nickel hydroxides are reviewed, including their magnetic, vibrational, optical, electrical and mechanical properties. The last section in this paper is intended to serve as a summary of both the potentially useful properties of these materials and the methods for the identification and characterization of 'unknown' nickel hydroxide-based samples.

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Structure and properties of precipitated nickel-iron hydroxides

Cited by 81 publications

References 9 publications

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Comparative structural and electrochemical study of high density spherical and non-spherical Ni(OH)2 as cathode materials for Ni–metal hydride batteries

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

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