Supercapacitive Swing Adsorption (SSA) is an alternative technique for carbon capture, which uses an applied electrical bias to enhance the tendency of CO2 to adsorb to the surface of activated carbon.  The bias adjusts sorbent charge density to reversibly favor either adsorption or desorption on electrodes, which are in contact with both gaseous CO2 and an aqueous electrolyte in a three-phase system.  Adsorption of CO2 is measured through pressure changes in a closed gas cell; a drop (rise) in pressure indicates enhanced adsorption (desorption) of CO2.  The dependence of observed changes in CO2 adsorption on electrolyte properties should elucidate whether the SSA mechanism operates through sorbent-gas interactions or electrolyte-gas interactions.  We present a comparison of SSA trends for saturated and 1M solutions of sodium chloride, potassium chloride and hydrochloric acid and reflect on the importance of electrolyte identity and concentration for understanding the SSA mechanism.

Electrolyte effects on selective CO<sub>2</sub> adsorption behavior in supercapacitive swing adsorption (SSA)

244th National Meeting (2012)

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Electrolyte effects on selective CO2 adsorption behavior in supercapacitive swing adsorption (SSA)

Electrolyte effects on selective CO₂ adsorption behavior in supercapacitive swing adsorption (SSA)