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Enrico Verlato - One of the best experts on this subject based on the ideXlab platform.
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Porous oxide electrocatalysts for Oxygen Evolution Reaction prepared through a combination of hydrogen bubble templated deposition, oxidation and galvanic displacement steps
Electrochimica Acta, 2018Co-Authors: Nicola Comisso, Lidia Armelao, Sandro Cattarin, Paolo Guerriero, Luca Mattarozzi, Marco Musiani, Marzio Rancan, Lourdes Vázquez-gómez, Enrico VerlatoAbstract:Abstract Porous oxide layers active in the Oxygen Evolution Reaction (OER) were prepared with the following sequence of steps: (i) porous Pb was produced by cathodic hydrogen bubble templated electrodeposition; (ii) Pb was partially converted to its oxides; (iii) Co 3 O 4 shells were formed on the surface of lead/lead oxides nanowires by spontaneous galvanic displacement Reactions. The effect of deposition current density and charge on the porous Pb morphology was studied. Deposits with extended surface areas were obtained and then oxidized in neutral Na 2 SO 4 solutions. Pb and PbO 2 , initially coexisting in oxidized samples, underwent a spontaneous Reaction leading to the formation of Pb 3 O 4 . Both PbO 2 and Pb 3 O 4 spontaneously reacted with Co 2+ to yield Co 3 O 4 layers. Co-modified electrodes described in this work had higher activity in Oxygen Evolution Reaction (OER) than those obtained by submitting to galvanic displacement porous PbO 2 layers prepared by Oxygen bubble templated anodic deposition.
Marco Musiani - One of the best experts on this subject based on the ideXlab platform.
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Porous oxide electrocatalysts for Oxygen Evolution Reaction prepared through a combination of hydrogen bubble templated deposition, oxidation and galvanic displacement steps
Electrochimica Acta, 2018Co-Authors: Nicola Comisso, Lidia Armelao, Sandro Cattarin, Paolo Guerriero, Luca Mattarozzi, Marco Musiani, Marzio Rancan, Lourdes Vázquez-gómez, Enrico VerlatoAbstract:Abstract Porous oxide layers active in the Oxygen Evolution Reaction (OER) were prepared with the following sequence of steps: (i) porous Pb was produced by cathodic hydrogen bubble templated electrodeposition; (ii) Pb was partially converted to its oxides; (iii) Co 3 O 4 shells were formed on the surface of lead/lead oxides nanowires by spontaneous galvanic displacement Reactions. The effect of deposition current density and charge on the porous Pb morphology was studied. Deposits with extended surface areas were obtained and then oxidized in neutral Na 2 SO 4 solutions. Pb and PbO 2 , initially coexisting in oxidized samples, underwent a spontaneous Reaction leading to the formation of Pb 3 O 4 . Both PbO 2 and Pb 3 O 4 spontaneously reacted with Co 2+ to yield Co 3 O 4 layers. Co-modified electrodes described in this work had higher activity in Oxygen Evolution Reaction (OER) than those obtained by submitting to galvanic displacement porous PbO 2 layers prepared by Oxygen bubble templated anodic deposition.
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anodic deposition of pbo2 co3o4 composites and their use as electrodes for Oxygen Evolution Reaction
Chemical Communications, 1996Co-Authors: Marco MusianiAbstract:Anodically produced composites in which both the matrix and the dispersed phase are metal oxides (e.g. PbO2/Co3O4) are active electrocatalytic materials for the Oxygen Evolution Reaction.
Hong Yang - One of the best experts on this subject based on the ideXlab platform.
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porous perovskite type lanthanum cobaltite as electrocatalysts toward Oxygen Evolution Reaction
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Jaemin Kim, Xuxia Chen, Pei Chieh Shih, Hong YangAbstract:Porous lanthanum cobaltite (LaCoO3) was prepared by hydrothermal Reaction and converted into hollow nanospheres through heat treatment. These hollow spheres were examined as electrocatalysts toward Oxygen Evolution Reaction (OER) using the rotating disk electrode technique in an alkaline solution. The obtained mass-specific OER activity was 7.51 A/g for porous LaCoO3 particles and 12.58 A/g for hollow LaCoO3 nanospheres at 1.60 V. These values were more than 4–6 times higher than that of bulk LaCoO3 compound (1.87 A/g). The OER performance of these perovskite-type LaCoO3 compounds was characterized using the Tafel equation, which showed the hollow nanospheres had the fastest kinetics among the three morphologies. The amorphous surface of these porous structures could contribute to the enhanced OER performance. The electrocatalytic and structural analysis results show the porous nanostructures with amorphous surface layers are important to achieve high activity toward OER for water splitting.
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ca2mn2o5 as Oxygen deficient perovskite electrocatalyst for Oxygen Evolution Reaction
ChemInform, 2015Co-Authors: Jaemin Kim, Xi Yin, Kai Chieh Tsao, Shaohua Fang, Hong YangAbstract:Phase-pure O-deficient Ca2Mn2O5 as an electrocatalyst for Oxygen Evolution Reaction (OER) in alkaline media is prepared under mild conditions via reductive annealing (350 °C, 5% H2/Ar) of CaMnO3 which is derived by sol-gel processing of a HNO3 solution of CaCO3, Mn(NO3)2, and citric acid (80 °C, 5 h).
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ca2mn2o5 as Oxygen deficient perovskite electrocatalyst for Oxygen Evolution Reaction
Journal of the American Chemical Society, 2014Co-Authors: Jaemin Kim, Xi Yin, Kai Chieh Tsao, Shaohua Fang, Hong YangAbstract:This paper presents the use of Ca2Mn2O5 as an Oxygen-deficient perovskite electrocatalyst for Oxygen Evolution Reaction (OER) in alkaline media. Phase-pure Ca2Mn2O5 was made under mild Reaction temperatures through a reductive annealing method. This Oxygen deficient perovskite can catalyze the generation of Oxygen at ∼1.50 V versus (vs) reversible hydrogen electrode (RHE) electrochemically, and reach an OER mass activity of 30.1 A/g at 1.70 V (vs RHE). In comparison to the perovskite CaMnO3, Ca2Mn2O5 shows higher OER activities. The molecular level Oxygen vacancies and high spin electron configuration on manganese in the crystal structures are likely the contributing factors for the enhanced performance. This work demonstrates that Oxygen-deficient perovskite, A2B2O5, is a new class of high performance electrocatalyst for those Reactions that involve active Oxygen intermediates, such as reduction of Oxygen and OER in water splitting.
Arne Thomas - One of the best experts on this subject based on the ideXlab platform.
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cobalt exchanged poly heptazine imides as transition metal nx electrocatalysts for the Oxygen Evolution Reaction
Advanced Materials, 2020Co-Authors: Xiaojia Zhao, Nadezda V Tarakina, Christian Teutloff, Wing Ying Chow, Robert Bittl, Arne ThomasAbstract:Poly(heptazine imides) hosting cobalt ions as countercations are presented as promising electrocatalysts for the Oxygen Evolution Reaction (OER). A facile mixed-salt melt-assisted condensation is developed to prepare such cobalt poly(heptazine imides) (PHI-Co). The Co ions can be introduced in well-controlled amounts using this method, and are shown to be atomically dispersed within the imide-linked heptazine matrix. When applied to electrocatalytic OER, PHI-Co shows a remarkable activity with an overpotential of 324 mV and Tafel slope of 44 mV dec-1 in 1 m KOH.
Nicola Comisso - One of the best experts on this subject based on the ideXlab platform.
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Porous oxide electrocatalysts for Oxygen Evolution Reaction prepared through a combination of hydrogen bubble templated deposition, oxidation and galvanic displacement steps
Electrochimica Acta, 2018Co-Authors: Nicola Comisso, Lidia Armelao, Sandro Cattarin, Paolo Guerriero, Luca Mattarozzi, Marco Musiani, Marzio Rancan, Lourdes Vázquez-gómez, Enrico VerlatoAbstract:Abstract Porous oxide layers active in the Oxygen Evolution Reaction (OER) were prepared with the following sequence of steps: (i) porous Pb was produced by cathodic hydrogen bubble templated electrodeposition; (ii) Pb was partially converted to its oxides; (iii) Co 3 O 4 shells were formed on the surface of lead/lead oxides nanowires by spontaneous galvanic displacement Reactions. The effect of deposition current density and charge on the porous Pb morphology was studied. Deposits with extended surface areas were obtained and then oxidized in neutral Na 2 SO 4 solutions. Pb and PbO 2 , initially coexisting in oxidized samples, underwent a spontaneous Reaction leading to the formation of Pb 3 O 4 . Both PbO 2 and Pb 3 O 4 spontaneously reacted with Co 2+ to yield Co 3 O 4 layers. Co-modified electrodes described in this work had higher activity in Oxygen Evolution Reaction (OER) than those obtained by submitting to galvanic displacement porous PbO 2 layers prepared by Oxygen bubble templated anodic deposition.
