Enhanced alkaline stability and performance of alkali-doped quaternized poly(vinyl alcohol) membranes for passive direct ethanol fuel cell

Norazuwana Shaari, Siti Kartom Kamarudin, Zulfirdaus Zakaria

Research output: Contribution to journalArticle

Abstract

Direct ethanol fuel cells (DEFCs) emerge as the new research energy field since fast production of electricity, high efficiency conversion, and simple fabrication process. The production cost, conductivity properties, and ethanol permeability of membrane were the main problem that limited the DEFC performance and commercialization. In this study, a low cost, good ionic conductivity and low ethanol permeability of an anion exchange membrane based on incorporation KOH-doped quaternized poly(vinyl alcohol) (QPVA) membrane (designed as QPVA/KOH) is synthesized and cross-linked with glutaraldehyde solution. The membrane is expected to cut the production cost and enhance the performance. In this work, an optimum of alkali-doped concentration has influence the membrane performance. The membrane has reveal high chemical stability even doped with 8-M KOH solution in 100°C. The morphology of membranes remained unbreakable and achieved high range of ionic conductivity (~10 −2  S cm −1 ). The membranes present maximum ionic conductivity 1.29 × 10 −2  S cm −1 at 30°C and 3.07 × 10 −2  S cm −1 at 70°C. The ethanol permeability of membrane is lower compared with the commercial membranes. Power density of alkaline DEFCs with platinum-based catalyst by using cross-linked QPVA/KOH membrane is 5.88 mW cm −2 , which is higher than commercial membranes at 30°C temperature. At 70°C, power density has increased up to 11.28 mW cm −2 and significantly increased up to 22.82 mW cm −2 via the nonplatinum-based catalyst. Moreover, according to the durability test, the performance of passive alkaline DEFC by using cross-linked QPVA/KOH membrane has maintained at 36.2% level. With such efficiency, the stack current density has been able to stay above 120 mA cm −2 for over 1000 hours, at 70°C.

Original languageEnglish
JournalInternational Journal of Energy Research
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Direct ethanol fuel cells (DEFC)
Alcohols
Membranes
Ionic conductivity
Alkaline fuel cells
Ethanol
Costs
Catalysts
Chemical stability

Keywords

  • AEM
  • alkaline DEFCs
  • QPVA/KOH
  • quaternary ammonium group

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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title = "Enhanced alkaline stability and performance of alkali-doped quaternized poly(vinyl alcohol) membranes for passive direct ethanol fuel cell",
abstract = "Direct ethanol fuel cells (DEFCs) emerge as the new research energy field since fast production of electricity, high efficiency conversion, and simple fabrication process. The production cost, conductivity properties, and ethanol permeability of membrane were the main problem that limited the DEFC performance and commercialization. In this study, a low cost, good ionic conductivity and low ethanol permeability of an anion exchange membrane based on incorporation KOH-doped quaternized poly(vinyl alcohol) (QPVA) membrane (designed as QPVA/KOH) is synthesized and cross-linked with glutaraldehyde solution. The membrane is expected to cut the production cost and enhance the performance. In this work, an optimum of alkali-doped concentration has influence the membrane performance. The membrane has reveal high chemical stability even doped with 8-M KOH solution in 100°C. The morphology of membranes remained unbreakable and achieved high range of ionic conductivity (~10 −2  S cm −1 ). The membranes present maximum ionic conductivity 1.29 × 10 −2  S cm −1 at 30°C and 3.07 × 10 −2  S cm −1 at 70°C. The ethanol permeability of membrane is lower compared with the commercial membranes. Power density of alkaline DEFCs with platinum-based catalyst by using cross-linked QPVA/KOH membrane is 5.88 mW cm −2 , which is higher than commercial membranes at 30°C temperature. At 70°C, power density has increased up to 11.28 mW cm −2 and significantly increased up to 22.82 mW cm −2 via the nonplatinum-based catalyst. Moreover, according to the durability test, the performance of passive alkaline DEFC by using cross-linked QPVA/KOH membrane has maintained at 36.2{\%} level. With such efficiency, the stack current density has been able to stay above 120 mA cm −2 for over 1000 hours, at 70°C.",
keywords = "AEM, alkaline DEFCs, QPVA/KOH, quaternary ammonium group",
author = "Norazuwana Shaari and Kamarudin, {Siti Kartom} and Zulfirdaus Zakaria",
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AU - Kamarudin, Siti Kartom

AU - Zakaria, Zulfirdaus

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N2 - Direct ethanol fuel cells (DEFCs) emerge as the new research energy field since fast production of electricity, high efficiency conversion, and simple fabrication process. The production cost, conductivity properties, and ethanol permeability of membrane were the main problem that limited the DEFC performance and commercialization. In this study, a low cost, good ionic conductivity and low ethanol permeability of an anion exchange membrane based on incorporation KOH-doped quaternized poly(vinyl alcohol) (QPVA) membrane (designed as QPVA/KOH) is synthesized and cross-linked with glutaraldehyde solution. The membrane is expected to cut the production cost and enhance the performance. In this work, an optimum of alkali-doped concentration has influence the membrane performance. The membrane has reveal high chemical stability even doped with 8-M KOH solution in 100°C. The morphology of membranes remained unbreakable and achieved high range of ionic conductivity (~10 −2  S cm −1 ). The membranes present maximum ionic conductivity 1.29 × 10 −2  S cm −1 at 30°C and 3.07 × 10 −2  S cm −1 at 70°C. The ethanol permeability of membrane is lower compared with the commercial membranes. Power density of alkaline DEFCs with platinum-based catalyst by using cross-linked QPVA/KOH membrane is 5.88 mW cm −2 , which is higher than commercial membranes at 30°C temperature. At 70°C, power density has increased up to 11.28 mW cm −2 and significantly increased up to 22.82 mW cm −2 via the nonplatinum-based catalyst. Moreover, according to the durability test, the performance of passive alkaline DEFC by using cross-linked QPVA/KOH membrane has maintained at 36.2% level. With such efficiency, the stack current density has been able to stay above 120 mA cm −2 for over 1000 hours, at 70°C.

AB - Direct ethanol fuel cells (DEFCs) emerge as the new research energy field since fast production of electricity, high efficiency conversion, and simple fabrication process. The production cost, conductivity properties, and ethanol permeability of membrane were the main problem that limited the DEFC performance and commercialization. In this study, a low cost, good ionic conductivity and low ethanol permeability of an anion exchange membrane based on incorporation KOH-doped quaternized poly(vinyl alcohol) (QPVA) membrane (designed as QPVA/KOH) is synthesized and cross-linked with glutaraldehyde solution. The membrane is expected to cut the production cost and enhance the performance. In this work, an optimum of alkali-doped concentration has influence the membrane performance. The membrane has reveal high chemical stability even doped with 8-M KOH solution in 100°C. The morphology of membranes remained unbreakable and achieved high range of ionic conductivity (~10 −2  S cm −1 ). The membranes present maximum ionic conductivity 1.29 × 10 −2  S cm −1 at 30°C and 3.07 × 10 −2  S cm −1 at 70°C. The ethanol permeability of membrane is lower compared with the commercial membranes. Power density of alkaline DEFCs with platinum-based catalyst by using cross-linked QPVA/KOH membrane is 5.88 mW cm −2 , which is higher than commercial membranes at 30°C temperature. At 70°C, power density has increased up to 11.28 mW cm −2 and significantly increased up to 22.82 mW cm −2 via the nonplatinum-based catalyst. Moreover, according to the durability test, the performance of passive alkaline DEFC by using cross-linked QPVA/KOH membrane has maintained at 36.2% level. With such efficiency, the stack current density has been able to stay above 120 mA cm −2 for over 1000 hours, at 70°C.

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