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Zhukova, O. S.; Lazareva, L. P.; Artemyanov, Andrey P.

doi:10.1023/a:1016678820188

Cited by 4 publications

(2 citation statements)

References 4 publications

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“… , Interestingly, hydrazine was the only substance that showed quite great electrocatalytical activity even on the purified samples. However, some of the previous works have reported that the oxidation of hydrazine can take place on the bare carbon electrodes. , The first oxidation peak maximum ranging from 0.7 to 0.9 V was followed by the second one between 1.4–1.8 V. A similar behavior has been previously reported, and the less-positive peak was associated with the direct oxidation of N 2 H 4 , while the second peak was interpreted in terms of a more-complex reaction mechanism involving radical intermediate formation . However, the changes of electrochemical activity were clearly visible on the oxidation of hydrazine, where the lowering of oxidation over-potential was clearly indicated for several unpurified graphene samples.…”

Section: Resultssupporting

confidence: 77%

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

et al. 2019

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Graphene and its derivatives have been reported in many articles as “metal-free” carbon electrocatalytic materials. Its synthesis procedures are generally based on the chemical oxidation of graphite and subsequent thermal or chemical reduction. Because graphene oxide has a large surface area and typically contains a variety of oxygen functionalities, metallic ions (impurities) from reaction mixtures can be adsorbed on its surface. These impurities can significantly enhance the electrocatalytic activity and thus lead to data misinterpretation; such impure samples are referred to as “metal-free” catalysts. In this paper, we report the synthesis of impurity-free graphene, which is compared with graphene prepared by standard methods based on the thermal and chemical reduction of two graphene oxides. Detailed analysis of graphene prepared by standard methods shows a direct relation between metallic impurities and the electrocatalytic activity of graphene. In contrast, impurity-free graphene exhibits poor electrocatalytic activity.

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Section: Resultssupporting

confidence: 77%

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

et al. 2019

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“…Concerted research work has been carried out to search for active electrocatalysts for hydrazine oxidation mainly with the aim of developing high‐performance hydrazine fuel cells . Pt‐based alloys have been considered the most active electrocatalyst for this reaction.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanostructured Co–Mo alloy electrodes and investigation of their electrocatalytic activity for hydrazine oxidation in alkaline medium

Abdolmaleki¹,

Bodaghi

Hosseini

et al. 2018

J Chinese Chemical Soc

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Funding informationOffice of the Vice-Chancellor in charge of research of Sayyed Jamaleddin Asadabadi University Cobalt and cobalt-molybdenum alloy electrodes are prepared by galvanic deposition on copper substrates. In this paper, we report a study on the influence of alloying cobalt with molybdenum for the oxidation of hydrazine in 1 M NaOH aqueous solutions. The electrocatalytic properties of the electrodes are studied by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS,) and inductively coupled plasma (ICP) analysis demonstrate that the structural features and compositions of the as-prepared Co-Mo coatings vary with the deposition conditions. Electrochemical characterization indicates that the electrochemical properties and the electrocatalytic activity of the investigated alloys were strongly dependent on the microstructural features obtained under different deposition conditions. The overall experimental data indicate that alloying cobalt with molybdenum metal leads to an increase of the electrocatalytic activity in hydrazine electroxidation compared to when using the pure cobalt electrode. High catalytic efficiencies were achieved on Co/25 at.% Mo and Co/33 at.% Mo electrodes, the latter being the best electrocatalyst for hydrazine electroxidation. K E Y W O R D Scyclic voltammetry, electrocatalytic activity, electrochemical impedance spectroscopy, electrodeposition, hydrazine electroxidation, nanostructured Co-Mo

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Group IV Organometallic Compounds Based on Dianionic “Pincer” Ligands: Synthesis, Characterization, and Catalytic Activity in Intramolecular Hydroamination Reactions

Luconi

Rossin

Motta

et al. 2013

Chemistry A European J

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Neutral Zr(IV) and Hf(IV) diamido complexes stabilized by unsymmetrical dianionic N,C,N' pincer ligands have been prepared through the simplest and convenient direct metal-induced Caryl-H bond activation. Simple ligand modification has contributed to highlight the non-innocent role played by the donor atom set in the control of the cyclometallation kinetics. The as-prepared bis-amido catalysts were found to be good candidates for the intramolecular hydroamination/cyclization of primary aminoalkenes. The ability of these compounds to promote such a catalytic transformation efficiently (by providing, in some cases, fast and complete substrate conversion at room temperature) constitutes a remarkable step forward toward catalytic systems that can operate at relatively low catalyst loading and under milder reaction conditions. Kinetic studies and substrate-scope investigations, in conjunction with preliminary DFT calculations on the real systems, were used to elucidate the effects of the substrate substitution on the catalyst performance and to support the most reliable mechanistic path operative in the hydroamination reaction.

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Untitled

Cited by 4 publications

References 4 publications

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

Preparation of nanostructured Co–Mo alloy electrodes and investigation of their electrocatalytic activity for hydrazine oxidation in alkaline medium

Group IV Organometallic Compounds Based on Dianionic “Pincer” Ligands: Synthesis, Characterization, and Catalytic Activity in Intramolecular Hydroamination Reactions

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