A pH-Gradient Flow Cell for Converting Waste CO2 into Electricity

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The CO2 concentration difference between ambient air and exhaust gases created by combusting fossil fuels is an untapped energy source for producing electricity. One method of capturing this energy is dissolving CO2 gas into water and then converting the produced chemical potential energy into electrical power using an electrochemical system. Previous efforts using this method found that electricity can be generated; however, electrical power densities were low, and expensive ion-exchange membranes were needed. Here, we overcame these challenges by developing a new approach to capture electrical power from CO2 dissolved in water, the pH-gradient flow cell. In this approach, two identical supercapacitive manganese oxide electrodes were separated by a nonselective membrane and exposed to an aqueous buffer solution sparged with either CO2 gas or air. This pH-gradient flow cell produced an average power density of 0.82 W/m2, which was nearly 200 times higher than values reported using previous approaches.

Original languageEnglish (US)
Pages (from-to)49-53
Number of pages5
JournalEnvironmental Science and Technology Letters
Volume4
Issue number2
DOIs
StatePublished - Feb 14 2017

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Electricity
Proton-Motive Force
electrical power
electricity
Gases
Ion exchange membranes
Manganese oxide
Water
Chemical potential
Exhaust gases
Air
Potential energy
Fossil fuels
Fossil Fuels
membrane
Buffers
Membranes
Ion Exchange
manganese oxide
potential energy

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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A pH-Gradient Flow Cell for Converting Waste CO2 into Electricity. / Kim, Taeyoung; Logan, Bruce E.; Gorski, Christopher A.

In: Environmental Science and Technology Letters, Vol. 4, No. 2, 14.02.2017, p. 49-53.

Research output: Contribution to journalArticle

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