Effects of Capping Agents on Shape, Stability, and Oxygen Evolution Reaction Activity of Copper Nanoparticles

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This study investigated the impact of silicon dioxide nanoparticle size on the viscosity and stability of nanofluids. A comprehensive study was conducted, including the synthesis and characterization of silicon dioxide nanoparticles of varying sizes, as well as the preparation and testing of nanofluids with different nanoparticle concentrations. The results show that nanoparticle size has a significant effect on both the viscosity and stability of nanofluids, with smaller nanoparticles leading to higher viscosity and improved stability. Silicon dioxide nanoparticles were dispersed in deionized water at mass fractions of 0.5% and 3% and average particle diameters of 12 and 40 nm using an ultrasonic disperser. The rheological properties of the obtained nanofluids at 304 K were studied depending on the mass concentration and linear size of nanoparticles in the liquid. An analysis of the results showed that the viscosity of the nanofluids increased with decreasing linear size of the nanoparticles. These findings have important implications for the development and optimization of nanofluid-based applications in various industries, such as electronics, energy, and biomedical engineering.

Section: ζ Potential Analysis Methodsmentioning

confidence: 99%

The Impact of Silicon Dioxide Nanoparticle Size on the Viscosity and Stability of Nanofluids: A Comprehensive Study

Payzullaev,

Allaev,

Mirzaev

et al. 2023

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“…This phenomenon suggests that the formation of diverse morphologies is influenced by the selective adsorption of capping agents onto specific crystal surfaces. [32][33][34] The capping agent, generated in an alkaline environment with a pH range of 7 to 13, is introduced into the system during particle development. The injected capping agent molecules tend to adsorb onto higher energy planes preferentially.…”

Section: Methodsmentioning

confidence: 99%

“…However, understanding the growth behavior of 111 facets and achieving precise control over the morphology of Cu 2 O growth on 111 planes remains challenging. 34 Based on experimental findings, introducing a strong alkali during the precipitation reaction plays a significant role in the synthesis process.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Growth Mechanism of Nano-Octahedrons: A Study on Cu₂O Core-Shell Structures for Oxygen Evolution Reaction

Parkash

2023

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This paper explores the process and growth mechanism involved in fabricating nano-octahedrons. Using two key components, CTAB and hydrazine hydrate, leads to the formation of octahedral shapes. A Cu2O octahedral core-shell structure was successfully created by employing a coating technique, and its performance in the oxygen evolution reaction (OER) was thoroughly evaluated. Due to its high dispersibility in ammonia solution, Cu2O serves as an excellent representative for other components. Additionally, this chapter provides a detailed account of the production of octahedral nanocages through the ammonia etching method. Notably, the Cu2O nano octahedra demonstrate superior OER performance compared to commercial RuO2, exhibiting a significantly low overpotential of only 370 mV at 10 mA cm-2. These findings bear important implications for designing stable core/shell nanostructures and hollow structures by implementing appropriate chemicals while also deepening our understanding of the formation of octahedral shapes.

“…For large-scale applications, efficient and low-cost catalysts are required to increase the reaction performance. 7 Therefore, many studies have been conducted to develop alternative catalysts to Pt. 8,9 The 3d transition metal catalysts afford advantages such as low cost, high efficiency, 10 and abundant reserves, and therefore, they show promise for reducing the cost and increasing the activity of the electrocatalytic HER.…”

mentioning

confidence: 99%

Performance of Low-Pressure-Plasma-Processed RuCo Electrocatalysts for Hydrogen Evolution Reaction

Tseng,

Su,

et al. 2023

RuCo/acid-treated nickel foam (ANF) has been reported to be an excellent electrocatalyst for the hydrogen evolution reaction (HER). In this study, we perform plasma treatment with Ar, Ar/H2 (95:5), and Ar/O2 (95:5) as working gases for surface modification to explore the effect on HER performance. The developed electrocatalysts are tested in an alkaline solution (1 M KOH); the results show that Ar/H2 (95:5) plasma treatment significantly improves the electrocatalytic activity of RuCo/ANF, achieving an overpotential of 98 mV at a current density of 10 mA cm−2. Electrochemical impedance spectroscopy and cyclic voltammetry analyses shSow a large reduction in the charge transfer impedance and a significant increase in the electric double-layer capacitance. This study provides a facile strategy to activate RuCo to improve HER performance.