Polymer electrolyte based on chemically stable and highly conductive alkali-doped polyoxadiazole for direct borohydride fuel cell

Mai, Zhensheng; Zhang, Huamin; Li, Xianfeng; Geng, Xiaoying; Zhang, Hongzhang

doi:10.1016/j.elecom.2011.06.029

Cited by 16 publications

(11 citation statements)

References 20 publications

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“…Generally, two mechanisms are responsible for transporting ions through the membrane in alkaline DOFC systems: functional groups 15 and alkali-doped free volumes. 16 Once a membrane is soaked in an alkaline solution, the membrane state is changed: many alkali-doped free volumes are formed, which can conduct ions under an electric field in a fashion similar to an aqueous solution. However, it should be noted that transporting ions by alkali-doped free volumes has a much lower transport resistance than by functional groups.…”

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confidence: 99%

Charge carriers in alkaline direct oxidation fuel cells

Zhao

et al. 2012

Energy Environ. Sci.

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confidence: 99%

Charge carriers in alkaline direct oxidation fuel cells

Zhao

et al. 2012

Energy Environ. Sci.

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“…In the ATR-FTIR spectrum (Figure 1a) of the es-Li-SPEOD, the peaks at 1604 and 1089 cm −1 belong to the C=N and =C−O−C= stretching vibrations of oxadiazole rings. 20,23,31 The peaks at 1397, 1031, and 736 cm −1 are assigned to the SO 2 and SO stretches of the −SO 3 Li groups. 23,32 The SO 2 stretch of the −SO 3 Li groups and phenoxathiine rings and the C−O−C stretch of the diphenyl ether groups give rise to a strong absorption band in the range of 1343∼1131 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…The 1 H NMR spectrum (Figure 1b) derived from DMSO-d 6 solution affords significant evidence for the thorough completion of cyclization of the polyhydrazides due to the absence of signal peaks in the range of 9.5∼11 ppm. [18][19][20]23 The assignments of the aromatic protons are determined by the electron-donating effect of the ether group and the electron-withdrawing effect of the sulfonic/sulfonyl and oxadiazole groups. 18,23,24,33 However, due to the overlapping of some signal peaks, it is very difficult to calculate the composition of the copolymer solely according to the 1 H NMR spectrum.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Separator Based on Sulfonated Polyoxadiazole with Outstanding Thermal Stability and Electrochemical Properties for Lithium-Ion Batteries

Wang

Luo

et al. 2021

ACS Appl. Energy Mater.

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Traditional polyolefin separators used in lithium-ion batteries (LIBs) are seriously limited by the issues of inferior security and poor electrolyte wettability. Most of the very promising candidate separators based on heat-resistant polymers are, however, inherently difficult to process. Herein, a unique sulfonated aromatic heterocyclic polymer, lithiated poly(diphenyl ether oxadiazole) sulfonate (Li-SPEOD), was synthesized through a simple one-pot method and further electrospun to act as a novel separator (es-Li-SPEOD) for LIBs. The prepared Li-SPEOD possesses a high degree of sulfonation with a high molecular weight (M w = 4.31 × 10 5 ). The es-Li-SPEOD separator exhibits excellent mechanical and fire-resistance properties and is able to maintain dimensional stability at a temperature of even up to 400 °C in air. The ionic conductivity (3.57 mS cm −1 ) and lithium-ion transference number (0.37) of the es-Li-SPEOD with an electrochemical stability window of 4.5 V vs Li + /Li can be improved by 382.4 and 32.1%, respectively, compared to those of Celgard-2500 in the LiPF 6 electrolyte. The enhanced rate capability and cycle performance of the LiFePO 4 −Li half-cell are therefore obtained. Moreover, the es-Li-SPEOD displays an outstanding dendrite-suppressing effect for the lithium metal anode. This research proves that the Li-SPEOD-based separator has a broad application perspective in next-generation lithium batteries.

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“…Other low‐cost hydrocarbon‐based solid polymer electrolytes have been considered to replace Nafion in DBFCs in the last 5 years . Yang et al synthesized polyvinyl alcohol (PVA)/hydroxyapatite composites for a DBFC and achieved 45 mW cm −2 with 1 M KBH 4 /4 M KOH as the anode fuel and air to the cathode at ambient temperature .…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al synthesized polyvinyl alcohol (PVA)/hydroxyapatite composites for a DBFC and achieved 45 mW cm −2 with 1 M KBH 4 /4 M KOH as the anode fuel and air to the cathode at ambient temperature . Mai et al prepared a DBFC with alkali‐doped poly‐(4,4′‐diphenylether‐1,3,4‐oxadiazole) as the DBFC separator with 1 M NaBH 4 and 3 M NaOH for the anode and oxygen for the cathode feed . They reached a power density of 146 mW cm −2 at 40 °C.…”

Section: Introductionmentioning

confidence: 99%

Direct borohydride fuel cell performance using hydroxide‐conducting polymeric nanocomposite electrolytes

Huang

Liu

Pan

et al. 2013

J Polym Sci B Polym Phys

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Solid electrolyte membranes based on alkali‐doped polyvinyl alcohol (PVA) and PVA/carbon nanotubes (PVA/CNTs) are used in direct borohydride fuel cells (DBFCs). As 0.05 wt % of CNT is incorporated into the PVA matrix, the polymer crystallinity is decreased from 42.4% to 38.0% and the fractional free volume increases from 2.48% to 3.53%. The KOH‐doped PVA/CNT exhibits the highest ionic conductivity of 0.0805 S cm−1, because of the increased polymer free volume (which promotes vehicular OH− transport) and the presence of CNT (which serves as the conducting microchannels). Sodium borohydride (NaBH4) in NaOH solution and potassium borohydride (KBH4) in KOH mixture are fed into the cells. The power density of the KBH4‐based DBFC is almost twice that of the NaBH4‐based DBFC (184 vs. 92 mW cm−2) due to less KBH4 permeability through the films, higher conductivity of the KOH‐doped PVA composites than those in the sodium counterpart, and probably higher electro‐catalytic kinetics. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1779–1789, 2013

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Polymer electrolyte based on chemically stable and highly conductive alkali-doped polyoxadiazole for direct borohydride fuel cell

Cited by 16 publications

References 20 publications

Charge carriers in alkaline direct oxidation fuel cells

Charge carriers in alkaline direct oxidation fuel cells

Electrospun Separator Based on Sulfonated Polyoxadiazole with Outstanding Thermal Stability and Electrochemical Properties for Lithium-Ion Batteries

Direct borohydride fuel cell performance using hydroxide‐conducting polymeric nanocomposite electrolytes

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