Graphene oxide-naphthalene sulfonate blends as possible proton exchange membranes

Virgilio, Matteo Di; Peressut, Andrea Basso; Latorrata, Saverio; Mariani, Marco; Dotelli, Giovanni

doi:10.1016/j.ssi.2022.115858

Cited by 11 publications

(20 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both Raman shifts are assigned to the symmetry CC vibration in the ring that links carbon with SO 3 stretching. Thus, the shift in the Raman peak from 1566 to 1561 cm –1 and the decrease of the signal intensity at 1623 cm –1 come from the increase of the defects in the S–O stretching due to the appearance of the possible Mo–O–S link . The reduction of the polar vibrations of the S–O bond results in increasing the Raman scatterers.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the shift in the Raman peak from 1566 to 1561 cm −1 and the decrease of the signal intensity at 1623 cm −1 come from the increase of the defects in the S−O stretching due to the appearance of the possible Mo−O−S link. 39 The reduction of the polar vibrations of the S−O bond results in increasing the Raman scatterers. FTIR curves were obtained between 1300 and 1000 cm −1 that characterize the vibrational band of the SO 3…”

Section: Effect Of Ns On the Chemical And Photophysical Properties Of...mentioning

confidence: 99%

See 1 more Smart Citation

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Nguyen,

Ishii,

Renaud

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

The photovoltaic performance of molybdenum cluster-sensitized solar cells has been explored with the challenge of enhancing their efficiency due to the low charge transfer efficiency. Aromatic sulfonate ligands (NS = naphthalene 2,6disulfonate = −OSO 2 −C 10 H 6 −SO 3 − ) were now used for the functionalization of the {Mo 6 I i 8 } cluster cores. The new functional [Mo 6 I 8 i I 3a (H 2 O) 2 a (NS) a ] cluster unit exhibits enhanced photophysical and photoelectrochemical properties compared to other homologues based on the {Mo 6 I 8 i } cluster cores. In greater detail, the role of the NS functional groups was beneficially emphasized for the improved oxidation stability of the cluster in a redox mediator, adjusting the emission lifetime to a suitable range for fast electron injection, and accelerating the charge transport process. The best as-synthesized Mo 6 cluster-based solar cell resulted in a stable photocurrent of 2.38 mA cm −2 with a fill factor of 0.63 and the power conversion efficiency of 0.97% under an AM 1.5 illumination, a two times' enhancement in comparison to the reference iodide Mo 6 cluster-based cell (0.52%). Specific attention focused on the increase of the power conversion efficiency up to 1.18% after 330 s and then reached the saturation trend. The enhanced charge transfer of the metal cluster complex was obtained from facile modifications of the functional apical ligands that result in advantageous photophysical and electrochemical characteristics, specializing in optoelectronic devices. This study provides the general methodology and knowledge for the next improvement of the photovoltaic efficiency of the Mo 6 cluster-based sensitized solar cells.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Ns On the Chemical And Photophysical Properties Of...mentioning

confidence: 99%

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Nguyen,

Ishii,

Renaud

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…After the treatment of 840 h, the membranes' conductivity could only keep ~48% of initial value (20.1 mS·cm −1 ), which corresponded to the reduction of IEC from 1.68 to 0.95 meq·g −1 and could be partly due to the degradation of DOA groups in alkaline solution. Recent researches showed that cross‐linking is an effective method to enhance alkaline stability, which could delay and/or hinder the attack of OH − ions on quaternary ammonium groups 62–66 . Considering that the benzylbromide groups possess strong activity and can be further utilized for crosslinking reactions, further work could be devoted to improving the alkaline stability of QFPESK‐m‐n by reserving some benzylbromide groups during the membrane formation and using appropriate crosslinking agents for building the cross‐linked network.…”

Section: Resultsmentioning

confidence: 99%

“…Recent researches showed that cross-linking is an effective method to enhance alkaline stability, which could delay and/or hinder the attack of OH À ions on quaternary ammonium groups. [62][63][64][65][66] Considering that the benzylbromide groups possess strong activity and can be further utilized for crosslinking reactions, further work could be devoted to improving the alkaline stability of QFPESK-m-n by reserving some benzylbromide groups during the membrane formation and using appropriate crosslinking agents for building the cross-linked network.…”

Section: Alkaline Stabilitymentioning

confidence: 99%

Comb‐shaped block poly(arylene ether sulfone ketone)s for anion exchange membranes

Lai,

Li,

Zheng

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

A well‐designed architecture is presented here to construct high‐performance anion exchange membranes (AEMs). A series of quaternized fluorene‐containing block poly(arylene ether sulfone ketone)s (QFPESK‐m‐n) is synthesized as the main chains, and grafted with comb‐shaped C8 long alkyl chains for the AEMs. By varying the hydrophilic segment’ length, there has been a significant change in the microstructure as well as phase separation morphology of the membranes, as confirmed by atomic force microscopy. Hence the as‐prepared AEMs with moderate ion exchange capacities (IECs) show enhanced hydroxide conductivities in the range of 28.8―94.7 mS⋅cm−1 from 30 to 80°C. Furthermore, based on the block backbones and hydrophobic comb‐shaped alkyl chains, the AEMs show low‐level swelling ratios of 4.3% to 9.2% at 30°C and from 6.2% to 13.2% at 80°C, and superior ratios of conductivity to swelling. In addition, the QFPESK‐m‐n AEMs also depict acceptable mechanical properties, good thermal stability and an optimizable alkaline stability.

show abstract

“…• a lab-built chamber filled with 0.6 L of deionized water and equipped with an external shell in which heated oil circulated; • a thermocouple for the temperature control; • two stainless steel electrodes assembled on a Teflon ® cell inside which the samples were clamped [39]; • a STEMlab™ 125-14 Bode Analyzer by Red Pitaya (Solkan, Slovenia).…”

Section: Functional Characterizationmentioning

confidence: 99%

Study of Innovative GO/PBI Composites as Possible Proton Conducting Membranes for Electrochemical Devices

et al. 2023

Self Cite

View full text Add to dashboard Cite

The appeal of combining polybenzimidazole (PBI) and graphene oxide (GO) for the manufacturing of membranes is increasingly growing, due to their versatility. Nevertheless, GO has always been used only as a filler in the PBI matrix. In such context, this work proposes the design of a simple, safe, and reproducible procedure to prepare self-assembling GO/PBI composite membranes characterized by GO-to-PBI (X:Y) mass ratios of 1:3, 1:2, 1:1, 2:1, and 3:1. SEM and XRD suggested a homogenous reciprocal dispersion of GO and PBI, which established an alternated stacked structure by mutual π-π interactions among the benzimidazole rings of PBI and the aromatic domains of GO. TGA indicated a remarkable thermal stability of the composites. From mechanical tests, improved tensile strengths but worsened maximum strains were observed with respect to pure PBI. The preliminary evaluation of the suitability of the GO/PBI X:Y composites as proton exchange membranes was executed via IEC determination and EIS. GO/PBI 2:1 (IEC: 0.42 meq g−1; proton conductivity at 100 °C: 0.0464 S cm−1) and GO/PBI 3:1 (IEC: 0.80 meq g−1; proton conductivity at 100 °C: 0.0451 S cm−1) provided equivalent or superior performances with respect to similar PBI-based state-of-the-art materials.

show abstract

Graphene oxide-naphthalene sulfonate blends as possible proton exchange membranes

Cited by 11 publications

References 56 publications

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Comb‐shaped block poly(arylene ether sulfone ketone)s for anion exchange membranes

Study of Innovative GO/PBI Composites as Possible Proton Conducting Membranes for Electrochemical Devices

Contact Info

Product

Resources

About