Mixed layered Ni–Mn–Co hydroxides: Crystal structure, electronic state of ions, and thermal decomposition

Косова, Н. В.; Devyatkina, E. T.; Каичев, В. В.

doi:10.1016/j.jpowsour.2007.06.109

Cited by 130 publications

(63 citation statements)

References 30 publications

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“…The energy separation of 2p 3/2 to 2p 1/2 and satellite structure of Co 2p spectrum are characterized to identify the chemical state of cobalt [25,26]. The binding energy of Co 2p 3/2 and Co 2p 1/2 are 780.41 and 795.63 eV, respectively, and the 2p 3/2 -2p 1/2 spin orbit splitting (DE) is 15.1 ± 0.1 eV, which are in good agreement with the reference data of Co 3 O 4 [19,27]. In addition, the weak satellite lines correspond well to the character of Co(III).…”

Section: Catalyst Characterizationsupporting

confidence: 75%

Catalytic degradation of bisphenol A by CoMnAl mixed metal oxides catalyzed peroxymonosulfate: Performance and mechanism

Zhu

et al. 2015

Chemical Engineering Journal

160

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Section: Catalyst Characterizationsupporting

confidence: 75%

Catalytic degradation of bisphenol A by CoMnAl mixed metal oxides catalyzed peroxymonosulfate: Performance and mechanism

Zhu

et al. 2015

Chemical Engineering Journal

160

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“…The couple bands at about 1470 cm −1 and 1380 cm −1 in both IR spectra can be assigned to c o vibration of the adsorbed CO 2 molecules due to the open system used for synthesis [38]. The band at about 1125 cm −1 corresponds to the vibration of SO 4 2− [39]. At low wave numbers, the bands at 460 cm −1 and 520 cm −1 are assigned to the bending vibration of Ni-O and stretching vibration of Ni-OH , respectively [40].…”

Section: Ir Spectramentioning

confidence: 91%

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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“…For x=0.00, there is the formation of a pure CoO phase, as shown in the XRD. As Ni and Mn are introduced into our samples (increasing x) and heated to 500°C in He there is a change in the diffraction pattern to what is probably a mixture of CoO, MnO, and NiO phases [4,7,8]. When x=0.45, the diffraction pattern presents a significant change compared to samples with x<0.45 and its main [4].…”

Section: Resultsmentioning

confidence: 86%

A novel coprecipitation method towards the synthesis of NixMnxCo(1–2x)(OH)2 for the preparation of lithium metal oxides

Rodrigues

Wontcheu

MacNeil

2011

J Solid State Electrochem

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A series of mixed metal hydroxide (Ni x Mn x Co (1-2x) (OH) 2 ) precursors for the preparation of lithiated mixed metal oxides (LiNi x Mn x Co (1-2x) O 2 ) were prepared using a novel coprecipitation approach based on the thermal decomposition of urea. Three different methods were used to achieve the temperature required to decompose urea and subsequently precipitate the hydroxides. The first two methods consisted of either a hydrothermal or microwaveassisted hydrothermal synthesis at 180°C and elevated pressures. The final method was an aqueous reflux at 100°C. A complete series (x=0.00-0.50) was prepared for each method and fully characterized before and after converting the materials to lithiated metal oxides (LiNi x Mn x Co (1-2x) O 2 ). We observed the formation of a complex structure after the coprecipitation of the hydroxides. Scanning electron micrographs images demonstrate that the morphology and particle size of the hydroxide particles varied significantly from x=0.00-0.50 under hydrothermal synthesis conditions. There is also a significant change in particle morphology as the urea decomposition method is varied. The X-ray diffraction profiles of the oxides synthesized from these hydroxide precursors all demonstrated phase pure oxides that provided good electrochemical performance.

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Mixed layered Ni–Mn–Co hydroxides: Crystal structure, electronic state of ions, and thermal decomposition

Cited by 130 publications

References 30 publications

Catalytic degradation of bisphenol A by CoMnAl mixed metal oxides catalyzed peroxymonosulfate: Performance and mechanism

Catalytic degradation of bisphenol A by CoMnAl mixed metal oxides catalyzed peroxymonosulfate: Performance and mechanism

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

A novel coprecipitation method towards the synthesis of NixMnxCo(1–2x)(OH)2 for the preparation of lithium metal oxides

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