Towards a designed synthesis of metallic nanoparticles in polyols – elucidation of the redox scheme in a cobalt–ethylene glycol system

Takahashi, K.; Yokoyama, S.; Matsumoto, Takatoshi; Huaman, Jhon L. Cuya; Kaneko, H.; Piquemal, Jean‐Yves; Miyamura, Hiroshi; Jeyadevan, Balachandran

doi:10.1039/c6nj01738j

Cited by 41 publications

(31 citation statements)

References 33 publications

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“…In another work, a detailed investigation of the mechanism by which Co NPs are formed using cobalt(II)‐ethylene glycole (EG) was reported [255] . The structural and spectral analyses such as XRD, nuclear magnetic resonance (NMR), Fourier‐transform infrared spectroscopy (FTIR) and electrospray ionisation time‐of‐flight mass spectrometry (ESI‐TOF‐MS) were used for monitoring and identifying the products formed during the redox process.…”

Section: Preparation Of Cobalt Nanoparticlesmentioning

confidence: 99%

Preparation of Cobalt Nanoparticles

et al. 2021

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The development of modern chemistry is currently proceeding in several priority areas including investigations focused on the synthesis, stabilisation, and application of transition metal nanoparticles (NPs), which are widely used in physical, chemical, engineering, and biomedical processes. A special place among known transition metal NPs is occupied by cobalt nanoparticles, since they are used for highly important targets, such as creation of new catalysts, magnetic devices, composites, or carriers for drug delivery. The selective preparation of NPs is a difficult task that requires special conditions and has some limitations. In this minireview, we summarise the most successful and most efficient methods for obtaining Co NPs, including chemical and physical aspects of their preparation.

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Section: Preparation Of Cobalt Nanoparticlesmentioning

confidence: 99%

Preparation of Cobalt Nanoparticles

et al. 2021

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“…Systematic reduction experiments of cobalt(II) salts in EG revealed the importance of the type of anion and the deprotonation of the polyol for the progress of the reduction reaction. 10,11 Like cobalt and nickel, copper particles can be obtained in polyols at elevated temperature. Copper and copper oxide nanomaterials, as cheap alternatives to precious metals, have found wide attention with respect to their potential application in catalysis, photovoltaics, and optics in the last years.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of the polyol reduction of copper(ii) salts depending on the anion type and diol chain length

2018

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The mechanisms of the polyol reduction of copper(ii) compounds were investigated by various systematic experiments. The course of the reduction in ethylene glycol strongly depends on the anion present in solution. Elemental copper can only be obtained in high yields starting from Cu(NO3)2, Cu(OAc)2, or Cu(OH)2; but not from CuCl2 or CuSO4. Intermediate compounds were observed, namely Cu2O, and the alkoxide compounds Cu(C2H4O2) and Cu3(OAc)2(C2H4O2)2. Cu3(OAc)2(C2H4O2)2 was characterised by single-crystal X-ray diffraction. It is a 2D coordination polymer with bridging bidentate acetate and bidentate deprotonated EG ligands leading to vertex- and edge-linked CuO5 polyhedra. Alkoxide compounds were also detected for higher glycol ethers. With growing glycol ether chain length the stability of alkoxide intermediates decreases, enhancing the stability range of Cu2O. Because the majority of copper species is precipitated as copper(ii) alkoxide compounds or Cu2O before the reduction to elemental copper occurs, only few nuclei are formed in solution leading to microparticles instead of nanoparticles. Much smaller but strongly agglomerated particles were observed under alkaline reaction conditions.

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“…In the meantime, the ethylene glycol is also polymerized to polyglycolic acid (Takahashi et al, 2016) that can act as an internal binder in the carbon-metal oxides coated on the nickel foam.…”

Section: Resultsmentioning

confidence: 99%

Toward Low-Cost and Sustainable Supercapacitor Electrode Processing: Simultaneous Carbon Grafting and Coating of Mixed-Valence Metal Oxides by Fast Annealing

2019

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There is a rapid market growth for supercapacitors and batteries based on new materials and production strategies that minimize their cost, end-of-life environmental impact, and waste management. Herein, mixed-valence iron oxide (FeOx) and manganese oxide (Mn3O4) and FeOx-carbon black (FeOx-CB) electrodes with excellent pseudocapacitive behavior in 1 M Na2SO4 are produced by a one-step thermal annealing. Due to the in situ grafted carbon black, the FeOx-CB shows a high pseudocapacitance of 408 mF cm−2 (or 128 F g−1), and Mn3O4 after activation shows high pseudocapacitance of 480 mF cm−2 (192 F g−1). The asymmetric supercapacitor based on FeOx-CB and activated-Mn3O4 shows a capacitance of 260 mF cm−2 at 100 mHz and a cycling stability of 97.4% over 800 cycles. Furthermore, due to its facile redox reactions, the supercapacitor can be voltammetrically cycled up to a high rate of 2,000 mV s−1 without a significant distortion of the voltammograms. Overall, our data indicate the feasibility of developing high-performance supercapacitors based on mixed-valence iron and manganese oxide electrodes in a single step.

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Towards a designed synthesis of metallic nanoparticles in polyols – elucidation of the redox scheme in a cobalt–ethylene glycol system

Abstract: A new redox reaction mechanism in the formation of Co metal particles using an ethylene glycol–cobalt system is proposed using NMR, ESI-MS, FT-IR and XRD as analytical tools.

Cited by 41 publications

References 33 publications

Preparation of Cobalt Nanoparticles

Preparation of Cobalt Nanoparticles

Mechanisms of the polyol reduction of copper(ii) salts depending on the anion type and diol chain length

Toward Low-Cost and Sustainable Supercapacitor Electrode Processing: Simultaneous Carbon Grafting and Coating of Mixed-Valence Metal Oxides by Fast Annealing

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