Enhancing the electro catalytic activity of manganese ferrite through cerium substitution for oxygen evolution in KOH solutions

Pandiarajan, T.; Ravichandran, S.; Berchmans, L. John

doi:10.1039/c4ra09806d

Cited by 22 publications

(9 citation statements)

References 30 publications

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“…The catalyst mixed with conductive carbon at a mass ratio of 1:1 was uniformly casted on the surface of glassy carbon (5 mm in diameter) with a loading of 0.25 mg/cm 2 (More details are described in Experimental Section in SI). During the process of oxygen evolution under oxygen environment, the redox of Mn 2+ in aqueous solution to Mn 3+ -oxyhydroxide has been observed even before the oxygen generation occurred, ,, where the formed metal hydroxide would contribute to the enhanced activity. The polarization curves (Figure a) show that all the resulting MnFe 2 O 4 electrodes exhibited good performances for water oxidation.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Mesoporous Manganese–Iron Nanorod Arrays Efficient for Water Oxidation

Yan

Jin

2016

ACS Sustainable Chem. Eng.

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Water splitting for the production of oxygen is a promising strategy to advance many renewable energy conversion systems, while the cost-effective and green synthesis of a high-performance catalyst composed of earth-abundant elements is still a big challenge. A facile and green synthesis of nonprecious MnFe2O4 nanorod arrays at low temperature is developed here, where the as-obtained hierarchical MnFe2O4 nanorod arrays exhibit mesoporous structure, large surface area and nice dispersion. These fabricated mesoporous MnFe2O4 nanorod arrays are efficient for water oxidation in 0.1 M NaOH, giving rise to a low overpotential of ∼0.315 VRHE at 10.0 mA cm–2, a high current density (10 times higher than that of commercial 20 wt % Pt/C catalyst at 1.80 VRHE) and largely enhanced stability. These performances are much superior to previously reported electro-oxidation catalysts as well as the state-of-the-art RuO2 and precious 20 wt % Pt/C catalysts. In particular, this preparation method of MnFe2O4 nanorods is amenable to fast and cost-effective production and shows promising applications in water splitting and other clean energy systems.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Mesoporous Manganese–Iron Nanorod Arrays Efficient for Water Oxidation

Yan

Jin

2016

ACS Sustainable Chem. Eng.

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“…In our previous work, 46 we performed the initial screening of catalysts in a standard three-electrode system using various concentrations of KOH electrolytes and showed that 0.2 M cerium substitution enhances the electrocatalytic activity of MnFe 2 O 4 for OER in alkaline solution.…”

Section: Half-cell Studiesmentioning

confidence: 99%

Fabrication of spinel ferrite based alkaline anion exchange membrane water electrolysers for hydrogen production

2015

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“…Among Fe, Co, and Ni (hydr)oxide systems, the oxides and hydroxides of Ni and Co are well-documented ones in literature. − Fe alone was reported as its oxyhydroxide, where Fe is in 3+ oxidation state for efficiently catalyzing OER in alkaline solutions. , When these metals are considered alone as hydroxides in its divalent state, the Ni 2+ is the highly active catalyst than the others in the same series due to its OER favoring d-electron configuration as per the reports of Subbaraman et al However, when a combination of more than one of these metals are considered, there are many catalyst systems that had been reported to be showing better activity than Ni(OH) 2 . − Among them, the cobaltates − (MCo 2 O 4 , M = Ni and Fe) and ferrites − (MFe 2 O 4 , M = Ni and Co) are the frequently reported ones. Between these two, the ferrites are better than cobaltates .…”

Section: Introductionmentioning

confidence: 99%

High-Performance Oxygen Evolution Anode from Stainless Steel via Controlled Surface Oxidation and Cr Removal

Anantharaj

Venkatesh

Salunke

et al. 2017

ACS Sustainable Chem. Eng.

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Improving the water oxidation performance of abundantly available materials, such as stainless steel (SS), with notable intrinsic electrocatalytic oxygen evolution reaction (OER) activity due to the presence of Ni and Fe is highly anticipated in water splitting. A new method for promoting the corrosion of stainless steel (304) was found which assisted the uniform formation of oxygen evolution reaction (OER) enhancing NiO incorporated Fe2O3 nanocrystals with the simultaneous reduction in the surface distribution of OER inactive Cr. An equimolar combination of KOH and hypochlorite was used as the corroding agent at 180 °C. The effect of corrosion time on the OER activity was studied and found that better water oxidation performance was observed when the corrosion time was 12 h (SS-12). The SS-12 showed an abnormal enhancement in OER activity compared to the untreated SS and other optimized versions of the same by requiring very low overpotentials of 260, 302, and 340 mV at the current densities of 10, 100, and 500 mA cm–2 along with a very low Tafel slope in the range of 35.6 to 43.5 mV dec–1. These numbers have certainly shown the high-performance electrocatalytic water oxidizing ability of SS-12. The comparative study revealed that the state-of-the-art IrO2 had failed to compete with our performance improved catalytic water oxidation anode “the SS-12”. This fruitful finding indicates that the SS-12 has the potential to be an alternate anode material to precious IrO2/RuO2 for alkaline water electrolyzers in future.

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Enhancing the electro catalytic activity of manganese ferrite through cerium substitution for oxygen evolution in KOH solutions

Abstract: Alkaline water electrolysis (AWE) is the simplest way of producing hydrogen, an attractive fuel for the future.

Cited by 22 publications

References 30 publications

Facile Synthesis of Mesoporous Manganese–Iron Nanorod Arrays Efficient for Water Oxidation

Facile Synthesis of Mesoporous Manganese–Iron Nanorod Arrays Efficient for Water Oxidation

Fabrication of spinel ferrite based alkaline anion exchange membrane water electrolysers for hydrogen production

High-Performance Oxygen Evolution Anode from Stainless Steel via Controlled Surface Oxidation and Cr Removal

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