Journal Article

FZJ-2021-00614

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impedance Model of a Water-Filled Pt Nanopore: Interfacial Charging and Chemisorption Effects

Sun, Y. (Corresponding author) ; Eikerling, M.FZJ* ; Zhang, J. ; Huang, J.FZJ*

2020
IOP Publishing Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/27039  doi:10.1149/1945-7111/ab864a

Abstract: 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.

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Contributing Institute(s):

1. IEK-13 (IEK-13)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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