Dear Sir/ma'am,

Thank you in advance for any help!

I do CO2 electroreduction in H-cell and flow cell.

Cell configuration: H-Cell

WE: Carbon paper(Freudenberg H23C6) 2cm^2 area

CE: Pt sheet

Reference electrode: Ag/AgCl

Electrolyte: 0.1M Phosphate buffer (PH 6.7)

Membrane: Sustanion AEM

Catalyst deposition: Cu nanoparticles on the microporous side of Freudenberg carbon paper with airbrushing; catalyst loading around 0.5mgcm^-2.

I am using this dual layer Freudenberg H23C6 carbon paper because in future I am going to test the same catalysts in my flow cell setup. otherwise the substrate in h-cell and flow cell will be different.

Another question: Why am I getting strange eis spectra in co2 saturated electrolyte, it does not fit in circle.

PEIS parameters:

10mV amplitude

freq. 0.1-10000

Thanks.