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Novel phosphoric acid doped polybenz...

Zhang, Haifeng.

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Novel phosphoric acid doped polybenzimidazole membranes for fuel cells.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Novel phosphoric acid doped polybenzimidazole membranes for fuel cells./
Author:	Zhang, Haifeng.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2004,
Description:	196 p.
Notes:	Source: Dissertations Abstracts International, Volume: 66-10, Section: B.
Contained By:	Dissertations Abstracts International66-10B.
Subject:	Polymers. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3157078
ISBN:	9780496896882

Novel phosphoric acid doped polybenzimidazole membranes for fuel cells.
Zhang, Haifeng.

Novel phosphoric acid doped polybenzimidazole membranes for fuel cells. - Ann Arbor : ProQuest Dissertations & Theses, 2004 - 196 p.

Source: Dissertations Abstracts International, Volume: 66-10, Section: B.

Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2004.

This item must not be sold to any third party vendors.

Acid doped polybenzimidazole (PBI®, called mPBI in this thesis) membranes are applied as electrolytes in high temperature polymer electrolyte membrane fuel cells (PEMFCs). Several series of homopolymers and copolymers with high I.V. were synthesized in PPA solution. A novel membrane fabrication and acid doping process, called the PPA process, was developed by casting the polymer-polyphosphoric acid (PPA) solution directly after polymerization without isolation or redissolution of the polymers. The PPA absorbed moisture from the atmosphere and hydrolyzed to phosphoric acid, which induced a sol-gel transition and produced a high acid doped PBI membrane. A water spray method was developed to make an acid doped ABPBI membrane by spraying water or dilute phosphoric acid onto the cast solution directly. This process induced film formation for ABPBI, but washed out most of the phosphoric acid dopant. A more rigid pPBI homopolymer was synthesized in PPA solution with high inherent viscosity (2∼3 dL/g). Acid doped pPBI membranes showed high acid doping level (pPBI·69H3PO4) and high conductivity (0.24 S/cm at 160°C). Fuel cells based on pPBI/PA showed good performance at various conditions. For example, a fuel cell based on pPBI/PA showed a maximum power density of 0.92 W/cm2 at 160°C and ambient pressure (H2/O2). The degradation rate of the cell potential was −21 mV/1,000 hours and −35 mV/1,000 hours at 160°C and 180°C, respectively in continuous testing. Fuel cells also showed good performance and tolerance to carbon monoxide poisoning when operated at temperatures higher than 120°C. The voltage drop was only 31 mV (from 0.657 V to 0.626 V at 0.3 A/cm2) when reformate gas (40.0% H2, 0.2% CO, 19.0% CO2, 40.8% N2) was used instead of pure hydrogen at one atmosphere pressure and 160°C. The structure-property relationships were investigated on the homopolymers and copolymers with different rigidities in the main chain. It is found that para-oriented structures greatly improved the mechanical properties, retained more acid in the membrane and showed higher fuel cell performance.

ISBN: 9780496896882Subjects--Topical Terms:

535398
Polymers.

Novel phosphoric acid doped polybenzimidazole membranes for fuel cells.
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245 1 0 $a Novel phosphoric acid doped polybenzimidazole membranes for fuel cells.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2004
300 $a 196 p.
500 $a Source: Dissertations Abstracts International, Volume: 66-10, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Benicewicz, Brian C.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2004.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Acid doped polybenzimidazole (PBI®, called mPBI in this thesis) membranes are applied as electrolytes in high temperature polymer electrolyte membrane fuel cells (PEMFCs). Several series of homopolymers and copolymers with high I.V. were synthesized in PPA solution. A novel membrane fabrication and acid doping process, called the PPA process, was developed by casting the polymer-polyphosphoric acid (PPA) solution directly after polymerization without isolation or redissolution of the polymers. The PPA absorbed moisture from the atmosphere and hydrolyzed to phosphoric acid, which induced a sol-gel transition and produced a high acid doped PBI membrane. A water spray method was developed to make an acid doped ABPBI membrane by spraying water or dilute phosphoric acid onto the cast solution directly. This process induced film formation for ABPBI, but washed out most of the phosphoric acid dopant. A more rigid pPBI homopolymer was synthesized in PPA solution with high inherent viscosity (2∼3 dL/g). Acid doped pPBI membranes showed high acid doping level (pPBI·69H3PO4) and high conductivity (0.24 S/cm at 160°C). Fuel cells based on pPBI/PA showed good performance at various conditions. For example, a fuel cell based on pPBI/PA showed a maximum power density of 0.92 W/cm2 at 160°C and ambient pressure (H2/O2). The degradation rate of the cell potential was −21 mV/1,000 hours and −35 mV/1,000 hours at 160°C and 180°C, respectively in continuous testing. Fuel cells also showed good performance and tolerance to carbon monoxide poisoning when operated at temperatures higher than 120°C. The voltage drop was only 31 mV (from 0.657 V to 0.626 V at 0.3 A/cm2) when reformate gas (40.0% H2, 0.2% CO, 19.0% CO2, 40.8% N2) was used instead of pure hydrogen at one atmosphere pressure and 160°C. The structure-property relationships were investigated on the homopolymers and copolymers with different rigidities in the main chain. It is found that para-oriented structures greatly improved the mechanical properties, retained more acid in the membrane and showed higher fuel cell performance.
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