Using nickel manganese oxide catalysts for efficient water oxidation

Menezes, Prashanth W.; Indra, Arindam; Levy, Ophir; Kailasam, Kamalakannan; Gutkin, Vitaly; Pfrommer, Johannes; Drieß, Matthias

doi:10.1039/c4cc09671a

Cited by 89 publications

(67 citation statements)

References 36 publications

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“…The O1s spectrum (Figure S6) could be deconvoluted into two (O1 and O2) main peaks. The peak at 530.4 eV (O1) can be correlated to the metal–oxygen bonds in Ag 3 PO 4 , whereas the peak at 532.2 eV (O2) is attributed to the −OH species absorbed on the surface either by surface hydroxides or by the substitution of oxygen atoms at the surface with hydroxyl groups …”

Section: Resultscontrasting

confidence: 48%

Morphology‐Dependent Activities of Silver Phosphates: Visible‐Light Water Oxidation and Dye Degradation

et al. 2016

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Conversion of sunlight to storable solar fuels offers a convenient and a promising route to renewable energy that is more important on account of the limited availability of fossil fuels and its global environmental benefits. One of the best ways to generate solar fuels is by splitting water into oxygen and hydrogen using visible‐light photocatalysts. Presented is a facile, scalable, and convenient strategy for the preparation of silver phosphate (Ag3PO4) particles with diverse morphology for visible‐light water oxidation and dye degradation. Changing the solvents in the reactions resulted in altered morphology such as ellipsoids, irregular shapes, polyhedra, and sphere‐type particles. These were then extensively characterized. Variation in the activity of photochemical water oxidation and dye degradation was observed during photocatalysis depending on the morphology, whereby the ellipsoids of Ag3PO4 displayed enhanced catalytic performance.

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Section: Resultscontrasting

confidence: 48%

Morphology‐Dependent Activities of Silver Phosphates: Visible‐Light Water Oxidation and Dye Degradation

et al. 2016

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“…[29] In many cases,t his transformation was restricted to the surface of the nanoparticles to form an amorphous shell or completely transformed into amorphous materials. [29] In many cases,t his transformation was restricted to the surface of the nanoparticles to form an amorphous shell or completely transformed into amorphous materials.…”

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Boosting Electrochemical Water Oxidation with Metal Hydroxide Carbonate Templated Prussian Blue Analogues

2017

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The development of efficient and stable catalyst systems with low-cost, abundant, and non-toxic materials is the primary demand for electrochemical water oxidation. A unique method is reported for the syntheses of metal hydroxide carbonate templated Prussian blue analogues (PBAs) on carbon cloth and their outstanding water oxidation activities in alkaline medium. The best water oxidation activity is obtained with cobalt hydroxide carbonate templated t-Co -Co with an overpotential as low as 240 mV to reach a current density of 10 mA cm . It produces constant current over 50 h in chronoamperometric measurements. Moreover, the catalysts outperform the activities of the PBAs prepared without any template and even the noble metal catalyst RuO . Spectroscopic and microscopic studies show that the PBAs are transformed into layered hydroxide-oxyhydroxide structures during electrochemical process and provide the active sites for the water oxidation.

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“…The development of improved Ni-based OER catalysts can be accelerated by an improved understanding of the intrinsic catalytic activity of materials and their dependence on catalyst composition and structure. The OER activity of Ni-based catalysts can be significantly enhanced by doping with other earth-abundant elements such as Co, Fe, Mn, and Zn171819202122. Therefore, a systematic study of the OER activities achieved when different dopants are added to Ni-based hydroxides would provide valuable insight into the synthesis of improved OER catalysts23.…”

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Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays

Tingting

Cao

Zhang

et al. 2017

Sci Rep

117

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Nickel-based hydroxide hierarchical nanoarrays (NiyM(OH)x HNAs M = Fe or Zn) are doped with non-noble transition metals to create nanostructures and regulate their activities for the oxygen evolution reaction. Catalytic performance in these materials depends on their chemical composition and the presence of nanostructures. These novel hierarchical nanostructures contain small secondary nanosheets that are grown on the primary nanowire arrays, providing a higher surface area and more efficient mass transport for electrochemical reactions. The activities of the NiyM(OH)x HNAs for the oxygen evolution reaction (OER) followed the order of Ni2.2Fe(OH)x > Ni(OH)2 > Ni2.1Zn(OH)x, and these trends are supported by density functional theory (DFT) calculations. The Fe-doped nickel hydroxide hierarchical nanoarrays (Ni2.2Fe(OH)x HNAs), which had an appropriate elemental composition and hierarchical nanostructures, achieve the lowest onset overpotential of 234 mV and the smallest Tafel slope of 64.3 mV dec−1. The specific activity, which is normalized to the Brunauer–Emmett–Teller (BET) surface area of the catalyst, of the Ni2.2Fe(OH)x HNAs is 1.15 mA cm−2BET at an overpotential of 350 mV. This is ~4-times higher than that of Ni(OH)2. These values are also superior to those of a commercial IrOx electrocatalyst.

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Using nickel manganese oxide catalysts for efficient water oxidation

Cited by 89 publications

References 36 publications

Morphology‐Dependent Activities of Silver Phosphates: Visible‐Light Water Oxidation and Dye Degradation

Morphology‐Dependent Activities of Silver Phosphates: Visible‐Light Water Oxidation and Dye Degradation

Boosting Electrochemical Water Oxidation with Metal Hydroxide Carbonate Templated Prussian Blue Analogues

Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays

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