Electrodeposition and characterization of polypyrrole films on T304 stainless steel

Piña-Beltrán, Diego Uriel; Hernandez-Tenorio, C.; Cortés-Escobedo, C.A.; Villanueva-Castañeda, M.; Moreno-Saavedra, Hilda

doi:10.1557/s43580-021-00200-3

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Further, in situ Fourier transform infrared (FT-IR) tests were recorded to reveal the potential host–guest interaction between C 3 H 6 and 1 . As clearly shown in Figure S11a, the peaks located in 1630, 1320, and 1171 cm –1 in both activated 1 and C 3 H 6 -loaded 1 were assigned to the CN adsorption band, symmetric carbonyl stretching, and C–O stretching vibrations in 1 structure. − While for C 3 H 6 -loaded 1 , some characteristic peaks associated with the propylene molecule were clearly observed. For example, the emerging peaks located at about 2924 and 1436 cm –1 could be attributed to symmetric C–H bending of terminal methyl and methylene motifs in propylene. , Also, the peak at around 996 cm –1 was the C–C stretching mode in propylene .…”

Section: Resultsmentioning

confidence: 89%

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Líu

et al. 2022

ACS Cent. Sci.

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Propylene production via nonoxidative propane dehydrogenation (PDH) holds great promise in meeting growing global demand for propylene. Effective adsorptive purification of a low concentration of propylene from quinary PDH byproducts comprising methane (CH 4 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ), propylene (C 3 H 6 ), and propane (C 3 H 8 ) has been an unsolved academic bottleneck. Herein, we now report an ultramicroporous zinc metal−organic framework (Zn-MOF, termed as 1) underlying a rigid one-dimensional channel, enabling trace C 3 H 6 capture and effective separation from quinary PDH byproducts. Adsorption isotherms of 1 suggest a record-high C 3 H 6 uptake of 34.0/92.4 cm 3 cm −3 (0.01/0.1 bar) at 298 K. In situ spectroscopies, crystallographic experiments, and modeling have jointly elucidated that the outstanding propylene uptakes at lower pressure are dominated by multiple binding interactions and swift diffusion behavior, yielding quasi-orthogonal configuration of propylene in adaptive channels. Breakthrough tests demonstrate that 30.8 L of propylene with a serviceable purity of 95.0−99.4% can be accomplished from equimolar C 3 H 6 /C 3 H 8 mixtures for 1 kg of activated 1. Such an excellent property is also validated by the breakthrough tests of quinary mixtures containing CH 4 /C 2 H 4 /C 2 H 6 /C 3 H 6 /C 3 H 8 (3/5/6/ 42/44, v/v/v/v/v). Particularly, structurally stable 1 can be easily synthesized on the kilogram scale using cheap materials (only $167 for per kilogram of 1), which is important in industrial applications.

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Section: Resultsmentioning

confidence: 89%

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Líu

et al. 2022

ACS Cent. Sci.

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“…The conductivity of that polymer was 32 S/m. [ 31 ] On the other hand, Wang polymerized PPy in a gas–liquid combination using Na 2 SO 4 , reaching conductivity in the 330–2870 S/m interval. [ 32 ] This last author followed a similar conjugation of liquid and gas phases of the hybrid plasma of this work, obtaining higher electrical conductivity, maybe due to the addition of sodium sulfate.…”

Section: Resultsmentioning

confidence: 99%

Electro‐polymerization of polypyrroles, comparison among electrochemistry, glow, and arc discharges

Ramírez,

Flores‐Nava,

Colín‐Orozco

et al. 2024

Plasma Processes & Polymers

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This work presents a comparison between electrochemical (Echem), plasma glow, and arc discharge polymerizations of pyrrole doped with iodine to correlate the energy of synthesis, chemical structure, and electrical conductivity of the polymers. Plasma glow discharges were used in the gas phase, electrochemistry in liquid, and arc discharges in a hybrid gas–liquid combination. Polypyrroles had structure and conductivity that varied with the synthesis parameters; Echem produced polymers with high carbonization and without the C≡N triple bonds resulting from the other syntheses. Conductivity divided the polymers in two: those synthesized in liquid were in the 0.01–1.0 S/m range, and those synthesized in gas were in the 10–9–10–7 S/m range, with differences of up to eight orders of magnitude due to the dopants and electrolytes.

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“…Figure 3 shows the low and high magnification images of the PPy, PPy–MTMS, and PPy–TMSPA. The PPy film sample ( Figure 3 b,c) shows a surface morphology with high roughness, and globular aggregates in the surface which are characteristic of electrodeposited PPy [ 9 ]. Adding silanes to the reaction media produces film samples with smoother surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis of this polymer is carried out usually through oxidative polymerization of pyrrole. The oxidation can be carried out by many different routes, such as electrochemical [ 9 ], chemical [ 10 ], or biocatalytic methods [ 11 ]. The electrochemical polymerization was the first method developed to synthesize this polymer and remains as one of the most useful due to its simplicity.…”

Section: Introductionmentioning

confidence: 99%

“…However, the poor adhesion of PPy to the substrate or electrode is usually the main problem. Several methodologies have been studied to increase electrode–PPy adhesion, such as electrode functionalization [ 12 , 13 , 14 ], optimization of the polymerization parameters [ 9 , 15 ], and adhesion promoters [ 16 , 17 , 18 ]. Alkoxysilanes are a group of compounds that have been used for a long time as adhesion promoters between inorganic surfaces and polymeric matrixes [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Deposition of Polypyrrole in the Presence of Silanes as Adhesion Promoters

et al. 2023

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Polypyrrole adhesion to indium–tin oxide electrodes was improved by adding pre-hydrolyzed alkoxysilanes to the electrodeposition media. The pyrrole oxidation and film growth rates were studied by potentiostatic polymerization in acidic media. The morphology and thickness of the films were studied by contact profilometry and surface-scanning electron microscopy. The bulk and surface semiquantitative chemical composition was studied by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. Finally, the adhesion was studied by scotch-tape adhesion test, where both alkoxysilanes showed a significant improvement in adhesion. We proposed a hypothesis for the improvement in adhesion, that involves the formation of siloxane material as well as in situ surface modification of the transparent metal oxide electrode.

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Electrodeposition and characterization of polypyrrole films on T304 stainless steel

Cited by 7 publications

References 10 publications

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Electro‐polymerization of polypyrroles, comparison among electrochemistry, glow, and arc discharges

Electrochemical Deposition of Polypyrrole in the Presence of Silanes as Adhesion Promoters

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