Micelle core as a nest for residence of molecular oxygen – An electrochemical study

Hossain, Md. Saddam; Sahed, Abu; Jahan, Nargis; Mollah, M. Yousuf A.; Susan, Md. Abu Bin Hasan; Islam, Md. Mominul

doi:10.1016/j.jelechem.2021.115361

Cited by 7 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to previous reports, the oxygen content in the electrolyte plays an important role in the side reaction process of the Zn metal anode . In PEGTE-5 electrolyte, the maximum amount of dissolved oxygen must occupy the space in the hydrophobic core of the micelle by van der Waals forces, so that the corrosion reactions caused by oxygen are significantly inhibited. The effect of PEGTE additive on the corrosion of Zn metal was investigated by a linear polarization measurement, as shown in Figure S9a.…”

mentioning

confidence: 99%

Nonionic Surfactant-Assisted In Situ Generation of Stable Passivation Protective Layer for Highly Stable Aqueous Zn Metal Anodes

Zhang

Zheng

et al. 2022

Nano Lett.

View full text Add to dashboard Cite

A highly stable interface for aqueous rechargeable Zn batteries is of importance to inhibit the growth of Zn dendrites and suppress the side reactions. In this work, we have developed a stable honeycomb-like ZnO passivation protective layer on the Zn surface, which is in situ generated with the assistance of a nonionic surfactant additive (polyethylene glycol tert-octylphenyl ether, denoted as PEGTE). The ZnO passivation layer can facilitate the uniform distribution of the electric field, guiding the uniform deposition of Zn2+ and inhibit the generation of dendrites. As a result, the symmetric cell using the electrolyte with PEGTE shows an excellent performance at high areal capacity, reflected by stable cycling for over 2400 h at 5 mAh/cm2 and 1300 h at 10 mAh/cm2. The full cell paired with V2O5 demonstrates a long lifespan for more than 600 cycles at a low negative/positive capacity ratio.

show abstract

mentioning

confidence: 99%

Nonionic Surfactant-Assisted In Situ Generation of Stable Passivation Protective Layer for Highly Stable Aqueous Zn Metal Anodes

Zhang

Zheng

et al. 2022

Nano Lett.

View full text Add to dashboard Cite

show abstract

“…At first glance, this result may appear to conflict with our electrochemical results, which reveal a high selectivity and activity of the 2-e − ORR when CTAB is in solution. To compensate for the increased wetting of the GDE, we believe micellization could be a key factor for the increased O 2 concentration at the electrode−electrolyte interface, 23 in turn leading to higher activity and higher selectivity toward the H 2 O 2 product. Thus, the increased hydrophilicity of the CTAB solution on the electrode surface does not have an adverse effect on the reaction, and the micelles are likely responsible for creating the aerophilic environment necessary for the ORR.…”

Section: Electrochemical Reduction Of O 2 To H 2 O 2 In An Acidic Env...mentioning

confidence: 99%

“…Inspired by biology, wherein micelles protect cells from the extracellular matrix, we propose utilizing amphiphilic surfactants to tune the hydrophobicity of the electrode–electrolyte interface and protect the electrode surface from the acidic bulk electrolyte. , Micelles in solution may have either or both of two effects (Figure ): increased O 2 solubility and thus increased O 2 transport due to micellization and a shielding effect that displaces protons from the EDL. ,, To demonstrate this idea, we added cetyltrimethylammonium bromide (CTAB, Figure S1a), a commonly used surfactant, to a strong acidic electrolyte (pH ∼ 1) to evaluate its impacts on the ORR selectivity of the carbon black catalyst. Carbon black catalyst has been demonstrated to show excellent H 2 O 2 selectivity in alkaline electrolyte but poor selectivity in acidic solutions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Adler,

Zhang,

Feng

et al. 2024

Precision Chemistry

View full text Add to dashboard Cite

The two-electron oxygen reduction reaction (2e − -ORR) can be exploited for green production of hydrogen peroxide (H 2 O 2 ), but it still suffers from low selectivity in an acidic electrolyte when using non-noble metal catalysts. Here, inspired by biology, we demonstrate a strategy that exploits the micellization of surfactant molecules to promote the H 2 O 2 selectivity of a low-cost carbon black catalyst in strong acid electrolytes. The surfactants near the electrode surface increase the oxygen solubility and transportation, and they provide a shielding effect that displaces protons from the electric double layer (EDL). Compared with the case of a pure acidic electrolyte, we find that, when a small number of surfactant molecules were added to the acid, the H 2 O 2 Faradaic efficiency (FE) was improved from 12% to 95% H 2 O 2 under 200 mA cm −2 , suggesting an 8-fold improvement. Our in situ surface enhanced Raman spectroscopy (SERS) and optical microscopy (OM) studies suggest that, while the added surfactant reduces the electrode's hydrophobicity, its micelle formation could promote the O 2 gas transport and its hydrophobic tail could displace local protons under applied negative potentials during catalysis, which are responsible for the improved H 2 O 2 selectivity in strong acids.

show abstract

“…As far as oxidation reactions in micellar media are concerned, most reported protocols use either stoichiometric amounts of transition metals − or primary oxidants such as hydrogen peroxide (H 2 O 2 ), tert -butyl hydroperoxide (TBHP), , or sodium hypochlorite (NaOCl) to run reactions such as the oxidation of alkenes, − phenols, or organosulfur compounds − and Baeyer–Villiger oxidations. , Aerobic oxidations have interestingly enough not been the object of many studies, despite the fact that air and O 2 are cheap and clean oxidants and exhibit high solubility inside the hydrophobic core of micelles, thus increasing local oxygen concentration. − Reported aerobic reactions are the Cu/TEMPO-catalyzed oxidation of benzylic and allylic alcohols, − the oxosulfonylation of aryl alkynes under acidic conditions, and the NaI-catalyzed oxidative sulfonylation of ketones. Gold nanoclusters trapped in the PEG chains of non-ionic cross-linked micelles have also been used to oxidize α-hydroxy ketones under oxygen to form the corresponding bis-ketone product …”

Section: Introductionmentioning

confidence: 99%

Vanadium Catalyst in Micelles: Toward a Greener Aerobic Oxidative Cleavage of Vicinal Diols in Water

Carpentier,

Denis,

Sanz Azcona

et al. 2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Aqueous micellar media offer an alternative to organic solvents for the development of safe and environmentally benign synthesis. A vanadium aminotriphenolate complex, known to be an effective catalyst for the aerobic oxidative C–C cleavage of vicinal diols in organic solvents, was incorporated in zwitterionic dodecyl phosphocholine (DPC) and in mixed TPGS-750-M:DPC micelles. It efficiently performed affording the corresponding carbonyl derivatives with no overoxidation, with catalyst loading down to 0.2 mol % and reaching TONs up to 500. The mixed micelles, which combine the enhanced stability conferred by zwitterionic DPC and the exceptional extraction properties of non-ionic TPGS-750-M, could be recycled and full conversion achieved upon reloading with catalyst and substrate. The study of the correlation between the reactivity of different substrates and their local concentration in the micellar core, derived from DOSY experiments, highlights that, while lipophilicity is important, the ease with which the substrate can access the catalyst, and therefore the location of the catalyst in the micellar phase, must also be considered when trying to rationalize reactivity in micelles.

show abstract

Micelle core as a nest for residence of molecular oxygen – An electrochemical study

Cited by 7 publications

References 51 publications

Nonionic Surfactant-Assisted In Situ Generation of Stable Passivation Protective Layer for Highly Stable Aqueous Zn Metal Anodes

Nonionic Surfactant-Assisted In Situ Generation of Stable Passivation Protective Layer for Highly Stable Aqueous Zn Metal Anodes

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Vanadium Catalyst in Micelles: Toward a Greener Aerobic Oxidative Cleavage of Vicinal Diols in Water

Contact Info

Product

Resources

About