Recent Developments and Issues for MEA Test Plan By Thomas I. - - PowerPoint PPT Presentation

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Recent Developments and Issues for MEA Test Plan By Thomas I. - - PowerPoint PPT Presentation

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Recent Developments and Issues for MEA Test Plan By Thomas I. Valdez Jet Propulsion Laboratory, California Institute of Technology NASA FUEL CELL MEETING Hyatt Regency San Francisco at Embarcadero Center WEDNESDAY, AUGUST 17, 2005 Elect

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Elect rochemical Technologies Group

Recent Developments and Issues for MEA Test Plan

By Thomas I. Valdez Jet Propulsion Laboratory, California Institute of Technology NASA FUEL CELL MEETING Hyatt Regency San Francisco at Embarcadero Center WEDNESDAY, AUGUST 17, 2005

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Elect rochemical Technologies Group

Presentation Outline

  • JPL’s Role and Responsibilities for the NASA ECP Program

– Task Overview – Program Schedule

  • NaBH4/H2O2 Test Stand

– Test Stand Components – DAQ GUI

  • NaBH4/H2O2 MEA Testing

– Experimental – Voltage-Time Plot – Resistance-Time Plot – Hydrogen Peroxide Cathode Performance (CH3OH/H2O2 System)

  • ECP Program Status

– Accomplishments – Program Schedule Detail – Future Work

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JPL Task Overview

  • Technical Objectives of Phase-I

– Characterize state-of-art NaBH4/H2O2 fuel cells – Evaluate new materials supplied by partners for improving reactant regeneration in NaBH4/H2O2 regenerative fuel cells – Test a NaBH4/H2O2 regeneration fuel cell based system fabricated by the industry team members – Support the development of a preliminary system design for kW-class regenerative NaBH4/H2O2 fuel cell based power source

  • Technical Objectives of Phase-II

– Characterize the performance of a kW-class NaBH4/H2O2 regeneration fuel cell system fabricated by the industry team members

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Phase I Project Schedule

  • 1. NaBH4/H2O2 Test Stand

Development

  • 2. NaBH4/H2O2 Cell Testing
  • 3. Design of 10W Regenerative

NaBH4/H2O2 System

  • 4. Testing of 10W Regenerative

NaBH4/H2O2 System

  • 5. Design kW-Class Regenerative

System

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NaBH4/H2O2 Test Stand

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Test Stand GUI

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Membrane

  • +

Direct Deposit Catalyst (Spray)

Type 1

Porous Toray 060 Backing

25 cm2

Experimental

MEA Specifications

  • Fabricated via a JPL direct deposit

technique

  • Non-Teflonized Toray 030 paper used

for the electrode backing

  • Cell Electrode Area: 25-cm2
  • Nafion 105 PEM
  • Fuel Cell Grade Pt-Black catalyst used

for the cathode

  • Pt:Ru/RuO2 (50:50/100) catalyst mix

used for the anode Reactant Specifications

  • Fuel: 5% NaBH4 (Alfa-Aesar) diluted

in a 25% NaOH solution (J. T. Baker)

  • Oxidant: 5% H2O2 stabilized -CMOS

grade solution (J. T. Baker)

  • All solutions were diluted with 18.2

mΩ water. 2” 2”

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NaBH4/H2O2 MEA Testing, Voltage-Time

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NaBH4/H2O2 MEA Testing, Resistance-Time

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Methanol-Hydrogen Peroxide Studies: Cathode Evaluation

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10 100 1000 Current Density (mA/cm2) Cell Potential vs. NHE (V) Ec,mix Ea 7 M 3.2 M 4.7 M 3.2 M ~ 3% H202 4.7 M ~ 11% H202 7 M ~ 16.5% H202

30 oC

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ECP Program Status: Summary of Accomplishments

Programmatic 4.1.1 NaBH4/H2O2 Fuel Cell Fabrication 4.1.1.1 Fuel cell fabrication review, UIUC (Complete) 4.1.1.2 Fuel cell fabrication review complete (Complete) 4.1.1.3 Receive catalysts from UIUC, Swift, ASU (50% Complete) 4.1.1.4 Catalyst received from UIUC, Swift, ASU 4.1.1.5 Develop MEA fabrication techniques specific to NaBH4/H2O2 (25% Complete) 4.1.2 NaBH4/H2O2 Fuel Cell Testing 4.1.2.1 Modify DMFC single cell test stand to for NaBH4/H2O2 testing (Complete) Other Work

  • We participated in the June 26th fuel cell fabrication review workshop held at UIUC.
  • JPL submitted presentation on fuel cell fabrication techniques and hydrogen peroxide

experimentation.

  • UIUC MEA Fabrication Review Action Item: Determine the temperature profile for an
  • rbiter traveling from Earth to Lunar orbit as well as the temperature profile for a landed

Lunar payload.

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ECP Program Status: Phase I Project Schedule (Detail)

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ECP Program Status: Future Work

3 Construction and Characterization of 10 W Regenerative NaBH4/H2O2 Fuel Cell 3.1 Design and fabrication of 10 W regenerative fuel cell (To Be Initiated) 3.1.1 Modify JPL FC models for NaBH4/H2O2 systems (To Be Initiated) 4 Catalyst/NaBH4 Optimization 4.1 Experiments with catalysts for positive and negative discharge electrodes 4.1.1 NaBH4/H2O2 Fuel Cell Fabrication 4.1.1.3 Receive catalysts from UIUC, Swift, ASU (50% Complete) (Catalyst formulations received) 4.1.1.4 Catalyst received from UIUC, Swift, ASU (In Progress) 4.1.1.5 Develop MEA fabrication techniques specific to NaBH4/H2O2 (In Progress) 4.1.2 NaBH4/H2O2 Fuel Cell Testing 4.1.2.1 Modify DMFC single cell test stand to for NaBH4/H2O2 testing (Complete) 4.1.2.2 Complete modifications to DMFC single cell test stand (Complete) 4.1.2.3 NaBH4/H2O2 MEA characterization and analysis, initial studies (In Progress)

  • Voltage-Current Performance
  • Characterize Fuel/Oxidant Utilization
  • Characterize Fuel/Oxidant Regeneration
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Acknowledgement

The work presented here was carried out at the Jet Propulsion Laboratory, California Institute of Technology for the National Aeronautics and Space Administration. This research was sponsored by NASA under a ESMD program.