Electrochemical CO2 reduction in acidic electrolyte.pptx
•Download as PPTX, PDF•
0 likes•624 views
Electrochemical CO2 reduction in acidic media is advantageous as the loss of carbonate formation (in alkaline media) is less and the current density is also high. The main goal is to suppress the competing hydrogen evolution reaction by careful optimization of electrode-electrolyte interface design.
Recommended
More Related Content
What's hot
What's hot (20)
Similar to Electrochemical CO2 reduction in acidic electrolyte.pptx
Similar to Electrochemical CO2 reduction in acidic electrolyte.pptx (20)
More from Helmholtz-Zentrum Berlin für Materialien und Energie
More from Helmholtz-Zentrum Berlin für Materialien und Energie (7)
Recently uploaded
Recently uploaded (20)
Electrochemical CO2 reduction in acidic electrolyte.pptx
- 1. Literature Presentation Debabrata Bagchi Ph. D. Student 11/09/2021 Electrochemical CO2 reduction in Acid medium 1
- 2. 1 Prof. Sargent 3 Prof. Sinton 2 Prof. Fengwang 1-3:University of Toronto, Canada; 2:University of Sydney.
- 3. CO2RR in basic, acid & neutral media 3 Acidic electrolyte Neutral/alkaline electrolyte CO2RR in flow cell Adv. Funct. Mater. 2021, 2102151 (CEM, nafion) (AEM, fumasep)
- 4. CO2RR in Flow cell and MEA 4 Alkaline Flow Cell Neutral Flow Cell MEA Electrolyzer Joule 2019, 3, 2777–2791
- 5. 5 Alkaline vs. Acidic Electrolyte Carbon efficiency in alkaline media is lower than in neutral media owing to additional consumption of CO2 by bulk OH–
- 6. 6 Which is good electrolyte Acid Neutral Alkaline (H+) (CO3 -) (OH-) High Current High CO2RR yield Low carbonate formation High CO2RR yield Moderate CO2RR yield Goal
- 7. 7 Acidic Electrolyte Acid with CEM @400 mA/cm2
- 8. 8 CO2 crossover tests in different electrolytes 1 M KHCO3 with AEM 0.5 M H3PO4 + 0.5 M KH2PO4 with CEM Acid with CEM Acid with CEM
- 9. 9 Cation augmenting strategy to improve CO2 activation kinetics in strong acid Central concept
- 10. 10 Modelling of pH near the cathode pH 1.94 pH 3.02 pH 3.96 pH 2 pH 3 pH 4 H3O+ mass transport limitation occurs and H2O becomes the main proton donor at the cathode surface
- 11. 11 Effect of KCl addition Faradaic efficiency on sputtered Ag with different KCl concentrations 200 mA/cm2
- 12. 12 Effect of K+ addition (A) 1 M H3PO4. (B) 1 M H3PO4 + 1 M KCl. (C) 1 M H3PO4 + 2 M KCl. (D) 1 M H3PO4 + 3 M KCl At current densities <200 mA/cm2 K+ does not play a role in the activation of CO2 nor does it suppress HER in a locally acidic environment
- 13. 13 Cation-enabled CO2 reduction in acid 1M H3PO4 at 400 mA/cm2 1 M H3PO4 and 3 M KCl on Cu 1 M H3PO4 and 3 M KCl Tafel slope analysis
- 14. 1M H3PO4 +2 M KCl 14 Role of K+ on HER and CO2RR Total 400 mA/cm2 +1 M KCl +3 M KCl Under a proton-depletion local environment, the cation triggers CO2 activation,
- 15. 15 Control study: Effect of anions on CO2RR @ 400 mA/cm2 In-situ EXAFS K+ is not changing electronic state of Cu Overall activity How to get more K+ near electrode surface ?
- 16. 16 Use of Cation-augmenting layer (CAL) v FE at different J perfluorosulfonic acid
- 17. 17 XPS of CAL
- 18. 18 CuNPs/PFSA composite material 1 M KCl 2 M KCl 3 M KCl CO2R selectivity reached 61%, including a total C2+FE of 40%
- 19. 19 Extended CO2R performance Current density of 1.2 A cm−2 1 M H3PO4 + 3 M KCl
- 20. 20 Operational cost breakdown of neutral CO2RR MEA electrolyzer and alkaline flow-cell electrolyzer in ideal scenario
- 21. 21 Techno-economic assessment of neutral CO2R MEA electrolyzer and alkaline flowcell electrolyzer, together with specific cost distribution per ton of ethylene produced Acid High Current High CO2RR yield No carbonate formation
- 22. 22