Topic
Hydrazine
About: Hydrazine is a research topic. Over the lifetime, 11059 publications have been published within this topic receiving 121281 citations. The topic is also known as: diazane & tetrahydridodinitrogen.
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TL;DR: The discovery of a highly active Ni-Co alloy electrocatalyst for the oxidation of hydrazine (N(2)H(4)) is reported and evidence for competing electrochemical (faradaic) and chemical (nonfarADAic) reaction pathways is provided.
Abstract: We report the discovery of a highly active Ni−Co alloy electrocatalyst for the oxidation of hydrazine (N2H4) and provide evidence for competing electrochemical (faradaic) and chemical (nonfaradaic) reaction pathways. The electrochemical conversion of hydrazine on catalytic surfaces in fuel cells is of great scientific and technological interest, because it offers multiple redox states, complex reaction pathways, and significantly more favorable energy and power densities compared to hydrogen fuel. Structure−reactivity relations of a Ni60Co40 alloy electrocatalyst are presented with a 6-fold increase in catalytic N2H4 oxidation activity over today’s benchmark catalysts. We further study the mechanistic pathways of the catalytic N2H4 conversion as function of the applied electrode potential using differentially pumped electrochemical mass spectrometry (DEMS). At positive overpotentials, N2H4 is electrooxidized into nitrogen consuming hydroxide ions, which is the fuel cell-relevant faradaic reaction pathway....
274 citations
TL;DR: Rhodium nanoparticles effectively catalyze the decomposition of hydrous hydrazine to produce hydrogen under ambient reaction conditions and show higher catalytic activity in relation to hexadecyltrimethyl ammonium bromide.
Abstract: Rhodium nanoparticles (NPs) effectively catalyze the decomposition of hydrous hydrazine to produce hydrogen under ambient reaction conditions Rh(0) NPs with a particle size of approximately 5 nm prepared in the presence of hexadecyltrimethyl ammonium bromide show higher catalytic activity
268 citations
TL;DR: In this article, a polydisperse colloid that is stable for many months without addition of any stabilizing material is presented, based on the reduction of aqueous silver nitrate by hydrazine dihydrochloride in weakly alkaline solution.
Abstract: Reduction of aqueous silver nitrate by hydrazine dihydrochloride in weakly alkaline solution results in a polydisperse colloid that is stable for many months without addition of any stabilizing com...
266 citations
261 citations
TL;DR: In this paper, a novel electrochemical sensor was fabricated by electrodeposition of gold nanoparticle on pre-synthesized polypyrrole (PPy) nanowire, forming an Au/PPy composite matrix on glassy carbon electrode (Au/Py/GCE), which exhibited strongly catalytic activity toward the oxidation of hydrazine and hydroxylamine.
Abstract: A novel electrochemical sensor was fabricated by electrodeposition of gold nanoparticle on pre-synthesized polypyrrole (PPy) nanowire, forming an Au/PPy composite matrix on glassy carbon electrode (Au/PPy/GCE). Field emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) techniques were used for characterization of the composite. As an electrochemical sensor, the Au/PPy/GCE exhibited strongly catalytic activity toward the oxidation of hydrazine and hydroxylamine. The kinetic parameters such as the electron transfer coefficient (α) and charge transfer rate constant (k) for the oxidation of hydrazine and hydroxylamine were determined utilizing cyclic voltammetry (CV). The diffusion coefficient (D) of both two species was also estimated using chronoamperometry. Furthermore, the linear range, current sensitivity and detection limit for hydrazine and hydroxylamine were evaluated by differential pulse voltammetry (DPV). The detection limit of hydrazine and hydroxylamine was 0.20 and 0.21 μM (s/n = 3), respectively. In addition, the sensor showed excellent sensitivity, selectivity, reproducibility and stability properties.
257 citations