Synthesis and structure refinement of layered double hydroxides of Co, Mg and Ni with Ga

Manohara, G. V.; Kamath, P. Vishnu

doi:10.1007/s12034-010-0050-8

Cited by 23 publications

(17 citation statements)

References 24 publications

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“…The calculated peaks are well consistent with the experimental one, confirming the rationality of the simulation (Figure b). In addition, the lattice parameters are similar to those reported CoGa LDH in the literature except for the Co/Ga ratio . The formula of the CoGa LDH in this work was thus determined to be [Co 3.8 Ga(OH) 9.6 ](CO 3 ) 0.5 · x H 2 O.…”

Section: Resultssupporting

confidence: 77%

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

et al. 2018

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smtd.201800286. Developing highly efficient and earth-abundant electrocatalysts is urgent for oxygen evolution reaction (OER), and layered double hydroxides (LDHs) show great potentials as advanced electrocatalysts toward OER. However, the catalytic activity of LDHs is normally limited by their poor electronic conductivity and low electrochemical active areas. Herein, a novel sputtering-painting-alloying-dealloying strategy is reported to synthesize CoGa LDH anchored on stainless steel mesh (CoGa LDH/stainless steel mesh, SSM), in which abundant oxygen vacancies are introduced into the ultrathin CoGa LDH nanosheets. Owing to the unique painting-like operation, the nanosheet-decorated CoGa LDH/SSM electrode can be fabricated on a large scale (8 × 8 cm 2 for instance), and possesses excellent flexibility and self-supported feature. Free of any conducting/binder agents, the CoGa LDH/SSM electrode shows excellent electrocatalytic activity toward OER in an alkaline solution (low overpotential of 258 mV @ 10 mA cm −2 , small Tafel slope of 34. 1 mV dec −1 , long-term stability of 70 h), which is superior to that of stateof-the-art Co-based electrocatalysts. More importantly, the electrode needs only an overpotential of 198 mV to reach 10 mA cm −2 at 335 K. The OER performance of CoGa LDH/SSM can be rationalized by numerous oxygen vacancies, ultrathin nanosheet morphology, self-supported nature, and low activation energy barrier. Oxygen Evolution

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Section: Resultssupporting

confidence: 77%

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

et al. 2018

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“…The projection on the isotropic dimension (F1) shows a single peak in the region for octahedral Ga, i.e. a single site, as is expected for MgGa LDH's [26]. The line shape in the anisotropic (F2) dimension is distorted in the 3QMAS spectrum due to the fairly large quadrupole interaction.…”

Section: Pxrd and Irmentioning

confidence: 54%

Local environment and composition of magnesium gallium layered double hydroxides determined from solid-state 1H and 71Ga NMR spectroscopy

Petersen

Lipton

Zorin

et al. 2014

Journal of Solid State Chemistry

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Ordering of gallium(III) in a series of magnesium gallium (MgGa) layered double hydroxides (LDH's), [Mg1-xGax(OH)2(NO3)x yH2O] was investigated using solid-state 1 H and 71 Ga NMR spectroscopy as well as powder X-ray diffraction. Three different proton environments from Mg3-OH, Mg2Ga-OH and intergallery water molecules were assigned and quantified using { 1 H, 71 Ga} HETCOR and 1 H MAS NMR. A single 71 Ga site originating from the unique Ga site in the MgGa LDH's was observed in 71 Ga MAS and 3QMAS NMR spectra. Both 1 H MAS NMR spectra recorded at 21.1 T (900MHz) and elemental analysis show that the synthesized MgGa LDH's had a lower

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“…Mn-LDH and finally because the ionic radius of Ga 3+ (0.76 Å)75 is close to that of Mn 3+ (0.78Å). As shown by the authors of this previous study,74 the strength of the coulombic attraction and hydrogen bonding between the layer and…”

mentioning

confidence: 53%

“…The refined M−OH 2.0410( 7 74 The comparison with the Co 4 Ga 2 (OH) 12 CO 3 •3H 2 O sample is particularly interesting, first, because of the presence of cobalt, second because the M 2+ /M 3+ ratio is equal to 2 like in Co 3 Mn-LDH, and finally because the ionic radius of Ga 3+ (0.76 Å) 75 is close to that of Mn 3+ (0.78 Å). As shown by the authors of this previous study, 74 All these characterizations converge to highlight a unique result never reported so far. Many papers on Co R Mn-LDH have investigated a wide range of Co/Mn ratios, but most of them have neither been reported nor discussed their chemical compositions in terms of oxidation states.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Insights into the Structure and the Electrochemical Reactivity of Cobalt-Manganese Layered Double Hydroxides: Application to H₂O₂ Sensing

et al. 2020

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A series of Co R Mn-LDH (R = 1, 2, 3, 4, 5) was synthesized by the coprecipitation method. The formation of layered double hydroxides (LDH) phases is confirmed by powder X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The energy dispersive X-ray analysis (EDX) shows the total coprecipitation of Co and Mn. The X-ray photoelectron spectroscopy (XPS) gives evidence of the joint presence of Co(II), Co(III) and Mn(III) in the LDH structures in proportion depending on the initial R value. The Rietveld refinement of the structure using the XRD data reveals that the sample with a CoMn ratio 3:1 displays a pure LDH phase containing mainly Co(II) and Mn(III) with a M(II)/M(III) of nearly 2.1, in agreement with the X-ray absorption spectroscopy (XAS) results at the Co and Mn K-edges, strong hydrogen bonding network involving CO 3 2-/OHcharge compensating anions in the interlayers. When compared with the other Co R Mn-LDH, the Co 3 Mn-LDH displays the best redox properties in an alkaline medium (0.1 M NaOH) and in a neutral pH (Tris buffer). An indepth study of the Co 3 Mn-LDH obtained after electrochemical oxidation was also performed. The evolution of Co and Mn oxidation state under electrochemical oxidation were evidenced by XPS. Finally, the performance of the Co 3 Mn-LDH modified electrode was determined for the electrocatalytic detection of hydrogen peroxide.

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Synthesis and structure refinement of layered double hydroxides of Co, Mg and Ni with Ga

Cited by 23 publications

References 24 publications

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

Local environment and composition of magnesium gallium layered double hydroxides determined from solid-state 1H and 71Ga NMR spectroscopy

Insights into the Structure and the Electrochemical Reactivity of Cobalt-Manganese Layered Double Hydroxides: Application to H₂O₂ Sensing

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Synthesis and structure refinement of layered double hydroxides of Co, Mg and Ni with Ga

Cited by 23 publications

References 24 publications

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst

Local environment and composition of magnesium gallium layered double hydroxides determined from solid-state 1H and 71Ga NMR spectroscopy

Insights into the Structure and the Electrochemical Reactivity of Cobalt-Manganese Layered Double Hydroxides: Application to H2O2 Sensing

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Insights into the Structure and the Electrochemical Reactivity of Cobalt-Manganese Layered Double Hydroxides: Application to H₂O₂ Sensing