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  • Chemistry/Pharmacy  (8)
  • 1
    Online Resource
    Online Resource
    Anisotropic Strain Boosted Hydrogen Evolution Reaction Activity of F-NiCoMo LDH for Overall Water Splitting
    The Electrochemical Society ; 2023
    In:  Journal of The Electrochemical Society Vol. 170, No. 3 ( 2023-03-01), p. 036509-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 170, No. 3 ( 2023-03-01), p. 036509-
    Abstract: Layered double hydroxide (LDH) catalysts provide promising OER activity which can be employed in overall water splitting for hydrogen production. However, their weak surface hydrogen adsorption (H ad ) and high water dissociation energy can result in the inferior hydrogen evolution reactions (HER) activity. In this paper, a highly efficient HER catalyst of F-doped NiCoMo LDH is successfully designed and synthesized through in situ growing on nickel foam (F-NiCoMo LDH/NF) for overall water splitting. DFT calculations demonstrate that the introduction of Mo and F atoms in NiCo LDH can induce the generation of anisotropic lattice strain, resulting in the generation of high-energy active interface and shifting the d -band centers. Therefore, the adsorption energy of H ad is optimized and the water dissociation energy barrier is decreased. As a result, this F-NiCoMo LDH/NF catalyst electrode displays a low overpotential of 107.5 mV at 10 mA cm −2 and a small Tafel slope of 67.2 mV dec −1 for HER. The assembled electrolyzer by employing this catalyst electrode requires only 1.83 V to deliver 300 mA cm −2 and operates stably for 100 h.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/acc555
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2023
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  • 2
    Online Resource
    Online Resource
    Green and Affordable Manufacturing Method for Multi-Scale Porous Carbon Nanofibers and Its Application in Vanadium Redox Flow Battery
    The Electrochemical Society ; 2022
    In:  Journal of The Electrochemical Society Vol. 169, No. 3 ( 2022-03-01), p. 030501-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 3 ( 2022-03-01), p. 030501-
    Abstract: Carbon nanofibers with multi-scale pores have been easily constructed by synchronous water etching during the carbonization process of PAN nanofibers, reducing the additional consumption of energy and time. After etching by high-temperature water vapor, the fiber surface becomes more coarse, and large amounts of etched pits are formed, effectively increasing the electrode’s specific surface area and hydrophilicity. Oxygen content is also significantly increased, which may effectively increase the electrocatalytic active sites of the electrode. Electrochemical tests verified the improved electrocatalytic activity and increased effective surface area. As a result, the VRFB single cell with water vapor etched carbon nanofibers as its electrode shows higher battery efficiencies than that with pristine carbon nanofibers; the energy efficiency improves by nearly 9.4% at 200 mA·cm −2 . After 100 charge/discharge cycles, the battery efficiency has no obvious attenuation, and the capacity attenuation rate of single cycle is nearly 0.26%，suggesting a satisfactory cycling stability. This green and simple method for constructing multi-scale porous carbon nanofibers electrode is expected to achieve large-scale production of high-performance electrode materials, and can be applied in various electrochemical energy storage systems.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac4b20
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Facial Construction of CePO 4 -Reduced Graphene Oxide Composite for Enhanced Electrochemical Detection of Dopamine and Acetaminophen
    The Electrochemical Society ; 2022
    In:  Journal of The Electrochemical Society Vol. 169, No. 6 ( 2022-06-01), p. 067505-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 6 ( 2022-06-01), p. 067505-
    Abstract: A serial of cerium phosphate/reduced graphene oxide (CePO 4 -rGO) composites were synthesized for the first time by one-pot hydrothermal method. Structural analyses revealed that flaky CePO 4 and few-layer rGO were composited homogeneously. It is found that rGO can greatly enhance the conductivity and the adsorption capacity of the composite. With these advantages, the constructed composites were used for electrochemical detection of dopamine (DA) and acetaminophen (APAP). Further studies show that the loading amount of rGO was also very important. When CePO 4 −0.6rGO was used, wide linear ranges of 1.2−50 μ M for DA and 0.5−30 μ M for APAP can be obtained, respectively. The detection limits of DA and APAP were 0.013 μ M and 0.025 μ M with high sensitivities of 25.58 μ A μ M −1 cm −2 and 13.30 μ A μ M −1 cm −2 , respectively. Moreover, the modified electrode also has high selectivity, good stability and satisfactory reproducibility. In addition, the modified electrode was also successfully applied to detect DA and APAP in real urine samples. This work provides a simple method for preparing new electrode materials for detecting small biomolecules.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac74e6
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Organic synthesis using carbon dioxide as phosgene-free carbonyl reagent
    Walter de Gruyter GmbH ; 2011
    In:  Pure and Applied Chemistry Vol. 84, No. 3 ( 2011-09-1), p. 581-602
    Details
    In: Pure and Applied Chemistry, Walter de Gruyter GmbH, Vol. 84, No. 3 ( 2011-09-1), p. 581-602
    Abstract: CO 2 is very attractive as a typical renewable feedstock for manufacturing commodity chemicals, fuel, and materials since it is an abundant, nontoxic, nonflammable, and easily available C1 resource. The development of greener chemical methodologies for replacing the utility of hazardous and environmentally undesirable phosgene largely relies on ingenious activation and incorporation of CO 2 into valuable compounds, which is of paramount importance from a standpoint of green chemistry and sustainable development. Great efforts have been devoted to constructing C–C, C–O, and C–N bond on the basis of CO 2 activation through molecular catalysis owing to its kinetic and thermodynamic stability. The aim of this article is to demonstrate the versatile use of CO 2 in organic synthesis as the alternative carbonyl source of phosgene, with the main focus on utilization of CO 2 as phosgene replacement for the synthesis of value-added compounds such as cyclic carbonates, oxa-zolidinones, ureas, isocyanates, and polymers, affording greener pathways for future chemical processes .
    Type of Medium: Online Resource
    ISSN: 1365-3075 , 0033-4545
    URL: Article
    DOI: 10.1351/PAC-CON-11-05-04
    RVK:
    VA 6665
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2011
    detail.hit.zdb_id: 2022101-0
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  • 5
    Online Resource
    Online Resource
    Graphene and Spherical CeO 2 -ZrO 2 Support Pt Nanoparticles as Anode Catalysts for Direct Methanol Fuel Cells
    The Electrochemical Society ; 2021
    In:  Journal of The Electrochemical Society Vol. 168, No. 5 ( 2021-05-01), p. 052507-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 168, No. 5 ( 2021-05-01), p. 052507-
    Abstract: Spherical CeO 2 and CeO 2 -ZrO 2 solid solutions are prepared using a hydrothermal method, Pt/CeO 2 -ZrO 2 /GO and Pt-CeO 2 /GO catalysts are prepared using graphene as a carrier, and the effects of the addition of a CeO 2 -ZrO 2 solid solution on the electrocatalytic activity, stability and anti-CO poisoning performance of methanol fuel cell anodes are investigated. The catalyst samples are characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the electrochemical properties of the catalysts are investigated using an electrochemical workstation (IVIUM). The results show that Pt/CeO 2 -ZrO 2 /GO has a higher electrocatalytic activity and stability against CO oxidation than Pt-CeO 2 /GO, Pt/GO and commercial Pt/C catalysts, which is attributed to ZrO 2 . When Zr 4+ is added into the CeO 2 lattice, the activity of oxygen in the CeO 2 lattice, the oxygen mobility and the oxygen vacancies are increased, the oxygen storage capacity is improved, and the intermediate product of CO is more easily oxidized. This finding indicates that Pt/CeO 2 -ZrO 2 /GO is a methanol oxidation anode catalyst with a good catalytic activity, stability and resistance to CO poisoning.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac0305
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    A Novel Self-Healing Conversion Film Formed on Rebar in Solution Containing Cerium and Molybdenum Ions
    The Electrochemical Society ; 2022
    In:  Journal of The Electrochemical Society Vol. 169, No. 1 ( 2022-01-01), p. 011501-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 1 ( 2022-01-01), p. 011501-
    Abstract: A novel conversion film containing cerium and molybdenum was synthesized on the rebar surface, and then the pitting sensitivity of the rebar was improved in a concrete environment containing chloride. This conversion film presented a two-layer structure, which involved CeMoO x as the outer layer and FeO x as the inner layer. The film with two-layer structure exhibited a strong corrosion resistance after being immersed in an alkaline environment (pH = 12.5) added with 0.1 M NaCl, and the charge transfer resistance ( R t ) could reach 5.88 × 10 6 Ω·cm 2 after immersion for 1600 h, which was approximately 2.5 times the initial R t value. Moreover, it was found that the film has a self-heal property when being damaged beyond the pitting potential. The anticorrosion mechanism of the film and its self-healing mechanism were discussed in depth in this study.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac453f
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
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  • 7
    Online Resource
    Online Resource
    Highly Efficient Carbon-Array-Supported MnO 2 /RuO 2 Cathodes for Lithium–Oxygen Batteries with Spatial and Induction Effects
    The Electrochemical Society ; 2020
    In:  Journal of The Electrochemical Society Vol. 167, No. 16 ( 2020-12-01), p. 160536-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 167, No. 16 ( 2020-12-01), p. 160536-
    Abstract: Through a facile, stepwise approach that includes electropolymerization, calcination, a hydrothermal method and low-temperature adsorption, a carbon array was coated with RuO 2 /MnO 2 to form a highly efficient composite catalyst (RuO 2 /MnO 2 @carbon array) for Li–O 2 batteries. The unique, hierarchical, three-dimensional array-type structure facilitates electrode wetting and oxygen transport as well as providing a large volume for Li 2 O 2 loading. The growth of MnO 2 nanosheets on the carbon array surface alters the surface roughness and provides attachment sites for the subsequent loading of catalyst nanoparticles. In addition, the introduction of RuO 2 induces the formation of Mn 3+ on the surface of MnO 2 , which not only improves the electrode conductivity but also the catalytic activity for ORR/OER. As a result, conformal growth of thin layers of Li 2 O 2 on the surface of the RuO 2 /MnO 2 @carbon array and reversible decomposition of Li 2 O 2 during cycling were achieved. In comparison with cathodes without a carbon array or catalyst, the Li–O 2 cell with a RuO 2 /MnO 2 @carbon array cathode exhibits an markedly improved performance with high discharge capacity (10 000 mAh g −1 at 100 mA g −1 ) and long cycling life (252 cycles at 200 mA g −1 with a limited capacity of 500 mAh g −1 ).
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/abd1f0
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2020
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  • 8
    Online Resource
    Online Resource
    Nanoporous Gold Prepared via Solid-Phase Reaction: Enhanced Thermal Stability and High Sensitvity for Electrochemical Detection of Glucose
    The Electrochemical Society ; 2021
    In:  Journal of The Electrochemical Society Vol. 168, No. 6 ( 2021-06-01), p. 066516-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 168, No. 6 ( 2021-06-01), p. 066516-
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac069a
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2021
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