<i>In situ</i> X‐ray diffraction studies on the production process of rhenium

Keilholz, Simon; Kohlmann, Holger; Uhlenhut, Henning; Gabke, Andrea; García‐Schollenbruch, Marlený

doi:10.1002/zaac.202200232

Cited by 1 publication

(1 citation statement)

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“…The intensity of the potassium 2p lines in the overview spectrum of this sample barely exceeded the noise level. Low-intensity K2p The presence of the KReO 4 phase can be explained by a number of processes: (i) thermal decomposition of KMnO 4 with the formation of products containing potassium [47]; (ii) thermal decomposition of NH 4 ReO 4 with the formation of intermediate products, including ReO 2 [48]; (iii) the interaction of potassium-containing products with ReO 2 to form KReO 4 .…”

Section: Xpsmentioning

confidence: 99%

Composite Based on Multi-Walled Carbon Nanotubes and Manganese Oxide with Rhenium Additive for Supercapacitors: Structural and Electrochemical Studies

Корусенко

Несов

2022

Applied Sciences

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The structure and electrochemical characteristics of composites based on multi-walled carbon nanotubes (MWCNTs) and manganese oxide with the addition of rhenium oxide has been studied. It has shown that the decorating of the MWCNT surface with layers or nanoparticles of manganese oxide (Mn(III) + Mn(IV)) provides more than a twofold increase in the value of the specific capacitance at low potential scan rates. However, composites based only on manganese oxide exhibit poor electrochemical behavior and the value of the specific capacitance decreases rapidly with increasing potential scan rate due to the limitation of diffusion processes. The addition of rhenium oxide to composites significantly increases their electrochemical properties due to changes in the chemical composition and morphology of composites. Studies of the structure and chemical state have shown that an improvement in the specific capacitance is provided by increasing in the proportion of Mn(IV) oxide in such composites, which has the ability to rapidly and completely reverse redox reactions and has lower electrical resistance values, compared to Mn(III) oxide. A detailed analysis of the voltammetric data showed that an increase in the rate capability in composites with the addition of rhenium oxide can also be provided by increasing the availability of the electrode surface for electrolyte ions and increasing the amount of charge stored due to the formation of a double electric layer.

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Section: Xpsmentioning

confidence: 99%