Synthesis and Pigmental Properties of Nickel Phosphates by the Substitution with Tetravalent Cerium Cation

Onoda, Hiroaki; Sakumura, Takeshi

doi:10.4236/msa.2011.211211

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…Thermogravimetric analysis (TGA) and differential thermogravimetric analysis (DTA) were performed in the temperature range of 25–750 °C to determine the hydration numbers of CPO and NPO. Only endothermic events (dehydration of adsorbed water and water of crystallization) were observed for CPO (Figure S2), whereas NPO exhibited a broad exothermic peak at 400 °C likely to be caused by the condensation of NiHPO 4 to Ni 2 P 2 O 7 with some dehydration . XRD measurements indicated that both CPO and NPO remained amorphous after the TGA measurements.…”

Section: Resultsmentioning

confidence: 99%

Activity of Transition‐Metal (Manganese, Iron, Cobalt, and Nickel) Phosphates for Oxygen Electrocatalysis in Alkaline Solution

et al. 2015

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Although transition‐metal oxides are common non‐platinum group metal catalysts for the industrially important oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), the performance gap between transition‐metal oxides and platinum group metal catalysts is still substantial and there is a continuing need to search for alternatives. In this study, transition‐metal (Mn, Fe, Co, and Ni) phosphates prepared by a solution chemistry method under ambient conditions are found to display interesting electrocatalytic properties for the ORR and OER in alkaline solution. Among them, manganese phosphate is more active than most state‐of‐the‐art manganese oxides for the ORR, and nickel phosphate is as active as the best Ni‐based catalysts for the OER. Hence these phosphates can be used as tandem catalysts for rechargeable metal–air batteries in which both the ORR and OER take place. The good performance may be attributed to the stabilization of the catalytic centers by the phosphate framework. This study establishes phosphates as yet another class of highly active low‐cost non‐platinum group metal alternatives for oxygen electrocatalysis in alkaline solution.

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Section: Resultsmentioning

confidence: 99%

Activity of Transition‐Metal (Manganese, Iron, Cobalt, and Nickel) Phosphates for Oxygen Electrocatalysis in Alkaline Solution

et al. 2015

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“…Transition metal phosphates have a weak point to solve in acidic and basic solutions. In previous work [14], the substitution with rare earth cation inhibited the elution of phosphates. Therefore, rare earth substituted iron phosphates have a possibility to use as a catalyst in solutions.…”

Section: Introductionmentioning

confidence: 85%

Synthesis and catalytic properties of iron - cerium phosphates with surfactant

Onoda

Sakumura

2013

Cerâmica

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Iron phosphate was prepared from iron nitrate and phosphoric acid with a surfactant, pentaethylene glycol mono dodecyl ether. The chemical composition of the obtained samples was estimated from ICP and XRD measurements. Particle shape and size distribution were observed by SEM images and laser diffraction / scattering methods. Further, the catalytic activity was studied with the decomposition of the complex between formaldehyde, ammonium acetate, and acetylacetone. The peaks of FePO4 were observed in XRD patterns of samples prepared in Fe/Ce=10/0 and then heated at 600 ºC. Other samples were amorphous in XRD patterns. Iron-cerium phosphates had high catalytic activity for the decomposition of the complex.

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“…In previous work [13], the substitution with rare earth cation inhibited the elution of phosphates. Therefore, rare-earth-substituted iron phosphates have a possibility to use as a catalyst in solutions.…”

Section: Introductionmentioning

confidence: 85%

Preparation and Catalytic Properties of Iron-Cerium Phosphates with Sodium Dodecyl Sulfate

Onoda

Sakumura

2012

ISRN Ceramics

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Iron phosphate was prepared from iron nitrate and phosphoric acid with sodium dodecyl sulfate at various stirring hours. The chemical composition of the obtained samples was estimated from ICP and XRD measurements. Particle shape and size distribution were observed by SEM images and laser diffraction/scattering methods. Further, the catalytic activity was studied with the decomposition of the complex between formaldehyde, ammonium acetate, and acetylacetone. The peaks of FePO 4 were observed in XRD patterns of samples prepared in Fe/Ce = 10/0 and then heated at 600• C. Other samples were amorphous in XRD patterns. Iron-cerium phosphates had high catalytic activity for the decomposition of the complex.

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Synthesis and Pigmental Properties of Nickel Phosphates by the Substitution with Tetravalent Cerium Cation

Cited by 6 publications

References 21 publications

Activity of Transition‐Metal (Manganese, Iron, Cobalt, and Nickel) Phosphates for Oxygen Electrocatalysis in Alkaline Solution

Activity of Transition‐Metal (Manganese, Iron, Cobalt, and Nickel) Phosphates for Oxygen Electrocatalysis in Alkaline Solution

Synthesis and catalytic properties of iron - cerium phosphates with surfactant

Preparation and Catalytic Properties of Iron-Cerium Phosphates with Sodium Dodecyl Sulfate

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