Electrochemically-Driven Carbon Dioxide Separation - Brian P. Setzler University of Delaware
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
Electrochemically-Driven
Carbon Dioxide Separation
DE-FE0031955
Brian P. Setzler
University of Delaware
U.S. Department of Energy
National Energy Technology Laboratory
Direct Air Capture Kickoff Meeting
February 24-25, 2021
Program Overview Funding: $800,000 federal + $200,000 cost share Period of Performance: 10/1/2020 ‒ 3/31/2022 Participants: University of Delaware Project Objectives: – Develop electrochemically-driven CO2 separator with 0.4 mol/m2-hr air capture at
Technology Background
Principles of operation Anion
Air
Cathode Exchange Anode
1. Generate OH‒ 1
Membrane
4
2. Scrub CO2 as CO32‒ OH‒ OH‒
3. Transport CO32‒ CO2
3
CO2
CO32‒ CO32‒
4. Consume OH‒ 2 5 CO2
5. Release CO2
400 ppm CO2 in
1.3 mol/m2-hr, 99% removal
Technical advantages
• Continuous separation H2-O2 powered cell, 60 °C
• Strong binding by OH‒ 1540 kJ/mol H2 consumption
• Electrically driven Courtesy of Stevi Matz, DE-AR0001034
3
• Ambient temperature
Technical Approach/Project Scope
1. Project management and planning
2. Membrane fabrication – Make flow-through PAP porous absorbers
3. Polymer/membrane characterization – Characterize dense and porous PAP polymer
properties necessary to predict EDCS performance
4. Membrane electrode assembly testing – Integrate absorber, membranes, and electrodes in
small single cells (25 cm2) and test EDCS performance
5. Process development – High-level process design and analysis
Mile- Sub- Planned
Milestone Description
stone task Completion
Membrane anion transport: Establish operating window where conductivity is ≥ 5
4 3.1 3/31/2021
mS/cm.
Membrane CO2 capture and release: Establish operating window where first-order
5 3.2 9/30/2021
rate constant is ≥1000 s-1 and where thick-film mass transfer coefficient is ≥1 mm/s.
Initial cell testing and performance: Demonstrate basic level of performance: ≤320
6 4.3 9/30/2021
kJ/mol (2 MWh/tCO2), 0.1 mol/m2-hr CO2 production (25 cm2)
Final cell performance: Characterize wide range of operating parameters. Final
7 4.3 3/31/2022
targets: ≤235 kJ/mol (1.5 MWh/tCO2), 0.4 mol/m2-hr CO2 production (25 cm2)
Process flowsheet: Complete flowsheet showing high-level process design and
8 5.1 3/31/2022
calculate mass and energy flows
Success criteria: - Characterize PAP properties to enable modeling and analysis 4
- Demonstrate technical feasibility at moderate performance levelTeam and Facilities Yushan Yan (PI) Brian Setzler (co-PI) James Buchen Thank you to our many colleagues whose foundational work made this project possible: • Junhua Wang • Yun Zhao • Teng Wang • Stevi Matz • Lin Shi • David Yan • Rohan Razdan • Catherine Weiss • Santiago Rojas-Carbonell Membrane and cell test stations • Junwu Xiao 5
Progress and Current Status of
Project
6000 8000 10000 12000
5
Equipment constructed / adapted Electrons to CO2 Ratio
e/CO2
4 a
3
• Polymer conductivity apparatus controlling 2
1
80
0
temperature, humidity, and CO2 concentration Average CO2 Transport b
nmol/s
40
0
Accomplishments -40
-80
• Fabricated porous absorbers 20 I/mA c
Current
0
• Ni(OH)2 electrodes with polymer electrolyte -20
0.8 Ewe/V d
Voltage
Performance achieved 0.4
0.0
-0.4
• Electrodes (affect cell voltage and reversal losses): -0.8
600 CO2 Anode e
0.32 V full cycle overpotential, 100 mAh/g
CO2
400
• Cell: 0.05 mol/m2-hr at 100 kJ/mol (0.6 MWh/t) 200
CO2 Cathode
600 f
CO2
• Target: 0.40 mol/m2-hr at 235 kJ/mol (1.5 MWh/t) 400
200
6000 8000 10000 12000
Air w/ ~400 ppm CO2 CO2
Seconds
Analyzer
Ni(OH)2 on Ni Foam w/ PAP-TP-85 • 25 cm2 cell
PAP-TP-85 Membrane CO2 • 500 sccm gas flows
6
Ni(OH)2 on Ni Foam w/ PAP-TP-85 CO2 • 60 °C cell temperature
Air w/ ~400 ppm CO2
Analyzer • 90% RHOpportunities for Collaboration
• Standardization of methods to characterize kinetics and
thermodynamics of CO2 in anion exchange polymers
• Fabrication of porous polymer films
• Structural properties are critical to device performance
• Project will cover only a small fraction of the possible
fabrication methods
• Development of CO2 hydration catalysts
• Accelerate CO2 capture
• Lower energy consumption (smaller pH swing)
• Technoeconomic analysis and manufacturing cost estimates
7You can also read
