Melamine adsorption on carbon materials: impact of carbon texture and surface chemistry

Hynes, Lucas; Montiel, Gonzalo; Jones, Allison; Riel, Donna; Abdulaziz, Muna; Viva, Federico A.; Bonetta, Dario; Vreugdenhil, Andrew J.; Trevani, Liliana

doi:10.1039/d0ma00097c

Cited by 12 publications

(10 citation statements)

References 32 publications

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“…Since Mel is characterized as a weak base, it may form protonated species in mild acid electrolytes. 25 The pH of ZnSO 4 and Mel/ZnSO 4 electrolytes is rst determined using a digital pH meter. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1b). 25 Therefore, it is concluded that Mel tends to form MelH + by coordinating with protons (H + ) in the Mel/ZnSO 4 electrolyte. It should be pointed out that since the coordination capability of Mel is inferior to that of NH 3 that cannot coordinate with Zn 2+ in weak acid solutions, the formation of the Zn 2+ -Mel complex is impossible in ZnSO 4 electrolyte.…”

Section: Resultsmentioning

confidence: 99%

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Highly reversible zinc metal anodes enabled by protonated melamine

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly reversible zinc metal anodes enabled by protonated melamine

et al. 2022

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“…The MF copolymer consists of 1,3,5-triazine, a flexible third amine and ether groups frequently used as an additive of separators, a N-doping reagent of active materials, and a cross-linker for mechanical maintenance of the composites. − For LIB applications, the thermal stabilities and cross-linking properties of MF copolymers are advantageous for preventing the elution of active materials and slurry inhomogeneity. Moreover, the 1,3,5-triazine backbones in the MF copolymer enable intensive interaction with CNTs, effectively restricting CNT folding. , Owing to the increased surface area of the well-dispersed CNTs that results from the inclusion of MF copolymers, HNBR-mediated gelation is restricted because of the loosened cross-linking of HNBR. In addition, the MF copolymer-mediated individualization of the CNTs affects their slurry dispersion during the general mixing process of the active materials, conductive carbon, the binder, and the melamine additive.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Moreover, the 1,3,5-triazine backbones in the MF copolymer enable intensive interaction with CNTs, effectively restricting CNT folding. 41,42 Owing to the increased surface area of the well-dispersed CNTs that results from the inclusion of MF copolymers, HNBR-mediated gelation is restricted because of the loosened cross-linking of HNBR. In addition, the MF copolymer-mediated individualization of the CNTs affects their slurry dispersion during the general mixing process of the active materials, conductive carbon, the binder, and the melamine additive.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Ahn

Park

Kim

et al. 2021

ACS Appl. Mater. Interfaces

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Cylindrical-type cells have been widely adopted by major battery and electric vehicle manufacturers owing to their price competitiveness, safety, and easy expandability. However, placement of electrodes at the core of cylindrical cells is currently restricted because of high electrode curvature and the lack of specialized electrodes and electrode materials. Here, we report the realization of highly flexible high-energy-density electrodes (active material loading of >98.4%) that can be used at the cores of cylindrical cells. The improved properties result from the introduction of a multifunctional poly(melamine-co-formaldehyde) (MF copolymer) additive, which yields a relatively more fluidic and well-dispersed slurry using only 0.08 wt %. MF copolymer-mediated formation of completely wrapped CNT/PVDF networks on LiCoO 2 (LCO) and accompanying contact enhancement between LCO and carbon nanotubes (CNTs) resulted in an increase of electrical and mechanical properties of the two types (composites with or without collectors) of electrodes compared with those of additive-free electrodes. Flexibility tests were carried out by rolling electrodes onto cylinder substrates (diameters of ca. 1 and 10 mm); this process resulted in relatively lower resistance changes of the MF copolymer-containing electrodes than for the reference electrodes. In addition, capacity retention after 100 cycles for cells with and without MF copolymers was approximately 10−20% better for the samples with the MF copolymer than for those without. CNT/PVDF networks with MF copolymers were proven to induce a relatively thin and stable cathode electrolyte interface layer accompanying the chemical bond formation during cycling.

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“…The study on LPE of BP with the aqueous solution is rarely conducted; moreover, it should be considered as how to effectively obtain as-exfoliated BP nanosheets with the issue regarding residual dispersants. ,− Thus, developing LPE of BP in an aqueous solution and further extraction of BP nanosheets is crucial for the versatile applications. Melamine-assisted LPE of graphene showed superior enhancement with high-yield and larger crystallite production due to the presence of hydrophilic NH 2 groups and π–π interaction between graphene and melamine. − Additionally, the as-exfoliated graphene is in situ encapsulated by melamine molecules which prevent oxidation of the graphene from acid species but can be easily washed away by water due to the high solubility of melamine nevertheless . Therefore, the strategy in this study for LPE of BP is using melamine in aqueous solution to obtain high-quality BP nanosheets.…”

Section: Introductionmentioning

confidence: 99%

Black Phosphorus Nanosheet/Melamine Cyanurate Assemblies as Functional Active Layers for Artificial Synapse Memristors

Hsieh

2021

ACS Appl. Nano Mater.

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The aqueous solution for the liquid-phase exfoliation (LPE) of 2D black phosphorus (BP) is rarely used due to the environmental instability of BP caused by oxygen and water molecules. In this study, we demonstrate a melamine-assisted LPE in aqueous conditions to achieve high-quality BP nanosheets with effective exfoliation, where the assembled melamine molecule on BP enhances the peeling force together with the in situ protection against BP oxidation, leading to the well-dispersion of highly crystalline BP in water that enables the eco-friendly and biocompatible process. Moreover, we develop an approach to extract BP together with a supramolecular assembly of melamine-cyanurate (MCA) by adding the cyanuric acid in melamine solution, formatting the hydrogen-bonded supramolecular network together with the incorporated BP nanosheets. Such one-step self-assembly of BP and the supramolecular complex are readily integrated into two-terminal devices, namely memristor and threshold switch (TS) selector, where BP nanosheets bridge the proton transfer of the hydrogen bond network in individual supramolecules, modulating analog resistive switching as synaptic behaviors of the neuromorphic system. TS selector is achieved through stacking pure MCA layer to block proton hopping under the threshold voltage, exhibiting high nonlinearity of 30 mV/dec with on/off resistance ratio up to 104 and retention time over 4000 s. This study provides an effective LPE of BP in aqueous solution and explores an extraction route of as-exfoliated BP with a supramolecular complex ready for integration of a memristor, which paves the way for versatile applications of BP on emerging nanoelectronics and optoelectronics.

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Melamine adsorption on carbon materials: impact of carbon texture and surface chemistry

Abstract: In this work, a comparative study between three carbon materials has been carried out to investigate the impact of the micro/mesoporous structure of the carbon substrate on their adsorption capabilities.

Cited by 12 publications

References 32 publications

Highly reversible zinc metal anodes enabled by protonated melamine

Highly reversible zinc metal anodes enabled by protonated melamine

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Black Phosphorus Nanosheet/Melamine Cyanurate Assemblies as Functional Active Layers for Artificial Synapse Memristors

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