TY  - JOUR
AU  - Sun, Ying
AU  - Eikerling, Michael
AU  - Zhang, Jianbo
AU  - Huang, Jun
TI  - Impedance Model of a Water-Filled Pt Nanopore: Interfacial Charging and Chemisorption Effects
JO  - Journal of the Electrochemical Society
VL  - 167
IS  - 6
SN  - 1945-7111
CY  - Bristol
PB  - IOP Publishing
M1  - FZJ-2021-00614
SP  - 066519 -
PY  - 2020
AB  - The impedance response contains rich information about an electrochemical system under investigation. Disentangling this highly convoluted information requires physical models. In this work, we develop a theoretical impedance model for a water-filled Pt nanopore, as a representative element in electrocatalytically active layers of polymer electrolyte fuel cells or electrolysis cells. The model accounts for double-layer charging, proton conduction and oxygen transport in the pore as well as chemisorption and oxygen reduction reaction at the Pt surface. It relaxes two widely used assumptions, namely, electroneutrality in solution phase and infinitely fast adsorption kinetics. Analytical impedance expressions are obtained for different limiting cases and impedance fingerprints of interfacial charging and chemisorption effects are identified.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000527148100001
DO  - DOI:10.1149/1945-7111/ab864a
UR  - https://juser.fz-juelich.de/record/890020
ER  -