The microstructure effect on ion conduction in composite electrolyte

Zheng, Keqing; Shen, Shuanglin

doi:10.1002/er.4184

“…solution and dry membrane were employed to elucidate the molecular-level interactions in the membrane assembly. [16] As shown in Figure S1-S2 , Compared with the FT-IR spectrum of RN,t he Nafion-Bi 12 -3 %a nd Nafion-Bi 12 -5 %m embranes displayed the characteristic vibrations of {H 6 Bi 12 O 16 }clusters, further certifying the composition of Nafion/{H 6 Bi 12 O 16 } hybrid membranes.M eanwhile,b yc omparing the FT-IR spectra results ( Figure S3), it can be also observed that as the content of the added {H 6 Bi 12 O 16 }c luster increases,t he broad peak at 3480 cm À1 (OH asymmetric stretching vibration) shifts towards al ower wavenumber,i ndicating the hydrogen bonding interaction between the Nafion and the bismuth oxygen cluster molecules.A ss hown in Figure S4, the Zeta potential measurements illustrate the existence of electrostatic interaction between the positively charged {H 6 Bi 12 O 16 } clusters and the negatively charged Nafion side chains.T he above results indicated that {H 6 Bi 12 O 16 }c lusters can be successfully hybridized into the Nafion membranes through electrostatic and hydrogen-bonding interactions. Figure 1a and S5-S6 exhibited the scanning electron microscopy (SEM) images of the cross-sectional morphology for RN,N afion-Bi 12 -3 %, and Nafion-Bi 12 -5 %m embranes, respectively.…”

Section: Resultsmentioning

confidence: 71%

Precise Molecular‐Level Modification of Nafion with Bismuth Oxide Clusters for High‐performance Proton‐Exchange Membranes

Liu

¹

,

Hu

²

,

Du

³

et al. 2021

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Fabricating proton exchange membranes (PEMs) with high ionic conductivity and ideal mechanical robustness through regulation of the membrane microstructures achieved by molecular‐level hybridization remains essential but challenging for the further development of high‐performance PEM fuel cells. In this work, by precisely hybridizing nano‐scaled bismuth oxide clusters into Nafion, we have fabricated the high‐performance hybrid membrane, Nafion‐Bi12‐3 %, which showed a proton conductivity of 386 mS cm−1 at 80 °C in aqueous solution with low methanol permeability, and conserved the ideal mechanical and chemical stabilities as PEMs. Moreover, molecular dynamics (MD) simulation was employed to clarify the structural properties and the assembly mechanisms of the hybrid membrane on the molecular level. The maximum current density and power density of Nafion‐Bi12‐3 % for direct methanol fuel cells reached to 432.7 mA cm−2 and 110.2 mW cm−2, respectively. This work provides new insights into the design of versatile functional polymer electrolyte membranes through polyoxometalate hybridization.

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“…Fourier‐transformed infrared (FTIR) spectra of recast Nafion (RN), Nafion‐Bi 12 ‐3 %, Nafion‐Bi 12 ‐5 % in casting solution and dry membrane were employed to elucidate the molecular‐level interactions in the membrane assembly [16] . As shown in Figure S1–S2, Compared with the FT‐IR spectrum of RN, the Nafion‐Bi 12 ‐3 % and Nafion‐Bi 12 ‐5 % membranes displayed the characteristic vibrations of {H 6 Bi 12 O 16 } clusters, further certifying the composition of Nafion/{H 6 Bi 12 O 16 } hybrid membranes.…”

Section: Resultsmentioning

confidence: 99%

Precise Molecular‐Level Modification of Nafion with Bismuth Oxide Clusters for High‐performance Proton‐Exchange Membranes

Liu

¹

,

Hu

²

,

Du

³

et al. 2021

View full text Add to dashboard Cite

Fabricating proton exchange membranes (PEMs) with high ionic conductivity and ideal mechanical robustness through regulation of the membrane microstructures achieved by molecular‐level hybridization remains essential but challenging for the further development of high‐performance PEM fuel cells. In this work, by precisely hybridizing nano‐scaled bismuth oxide clusters into Nafion, we have fabricated the high‐performance hybrid membrane, Nafion‐Bi12‐3 %, which showed a proton conductivity of 386 mS cm−1 at 80 °C in aqueous solution with low methanol permeability, and conserved the ideal mechanical and chemical stabilities as PEMs. Moreover, molecular dynamics (MD) simulation was employed to clarify the structural properties and the assembly mechanisms of the hybrid membrane on the molecular level. The maximum current density and power density of Nafion‐Bi12‐3 % for direct methanol fuel cells reached to 432.7 mA cm−2 and 110.2 mW cm−2, respectively. This work provides new insights into the design of versatile functional polymer electrolyte membranes through polyoxometalate hybridization.

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“…On the other hand, proton conductors are promising candidates for SOFC electrolytes since they have high protonic conductivity at low temperatures [ 20 , 21 ]. BCZYs from cerate and zirconate families are considered promising perovskite electrolytes because, at low temperatures, they exhibit high proton conductivity [ 20 , 22 , 23 ]. Ni et al observed that barium cerate (BaCeO 3 ) electrolytes exhibit high ionic conductivity that can be enhanced to 10 −2 Ω −1 cm −1 by (15–20%) doping of yttrium.…”

Section: Introductionmentioning

confidence: 99%

Influence of Low Sintering Temperature on BaCe0.2Zr0.6Y0.2O3−δ IT-SOFC Perovskite Electrolyte Synthesized by Co-Precipitation Method

Rafique

¹

,

Safdar

²

,

Irshad

³

et al. 2022

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BaCe0.2Zr0.6Y0.2O3−δ (BCZY) perovskite electrolytes were synthesized for intermediate-temperature solid oxide fuel cell with a cost-effective and versatile co-precipitation method. The synthesized BCZY electrolytes were sintered at 900, 1000, and 1100 °C to observe the effects of low sintering temperature on the structural, morphological, thermal, and electrical properties of BCZY. All BCZY electrolytes materials exhibited a crystalline perovskite structure and were found to be thermally stable. The crystallinity and conductivity of BCZY electrolyte enhanced with increased sintering temperature, due to the grain growth. At the same time, secondary phases of carbonates were also observed for samples sintered at a temperature lower than 1100 °C. The BCZY sintered at 1100 °C exhibited a density >95%, and a power density of 350 mWcm−2 with open-circuit voltage 1.02 V at 650 °C was observed due its dense and airtight structure. Based on the current investigation, we suggest that the BaCe0.2Zr0.6Y0.2O3−δ perovskite electrolyte sintered at a temperature of 1100 °C is a suitable electrolyte for IT-SOFC.

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The microstructure effect on ion conduction in composite electrolyte

Cited by 4 publications

References 22 publications

Precise Molecular‐Level Modification of Nafion with Bismuth Oxide Clusters for High‐performance Proton‐Exchange Membranes

Precise Molecular‐Level Modification of Nafion with Bismuth Oxide Clusters for High‐performance Proton‐Exchange Membranes

Precise Molecular‐Level Modification of Nafion with Bismuth Oxide Clusters for High‐performance Proton‐Exchange Membranes

Influence of Low Sintering Temperature on BaCe0.2Zr0.6Y0.2O3−δ IT-SOFC Perovskite Electrolyte Synthesized by Co-Precipitation Method

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