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Non-equilibrium thermodynamics of mixed ionic-electronic conductive electrodes and their interfaces: a Ni/CGO study
- Source :
- Journal of Materials Chemistry A, 10(20), 11121-11130. Royal Society of Chemistry
- Publication Year :
- 2022
- Publisher :
- Royal Society of Chemistry (RSC), 2022.
-
Abstract
- Non-equilibrium thermodynamics describe the current–voltage characteristics of electrochemical devices. For conventional electrode–electrolyte interfaces, the local activation overpotential is used to describe the electrostatic potential step between the two materials as a current is generated. However, the activation overpotential for the metal/mixed ionic-electronic conducting (MIEC) composite electrodes studied in this work originates at the MIEC–gas interface. Moreover, we have studied the effects of non-equilibrium on the electrostatic surface potential and evaluated its influence over electrode kinetics. By investigating two phase (2PB) and three phase boundary (3PB) reactions at the Ni/Ce1−xGdxO2−δ (Ni/CGO) electrode, we have demonstrated that the driving force for coupled ion-electron transfer is held at the CGO–gas interface for both reaction pathways. We also determined that the rate of coupled ion-electron transfer via the 3PB scales with the availability of free sites on the metallic surface, revealing a Sabatier-like relationship with regards to the selection of metallic phases. Finally, we demonstrated how the theory of the electrostatic surface potential can be applied to other systems outside of the well-studied H2/H2O electrode environment. These findings therefore provide an insight into the design of future electrode structures for a range of electrochemical devices.
- Subjects :
- Technology
CERIA
Science & Technology
Energy & Fuels
Chemistry, Physical
Renewable Energy, Sustainability and the Environment
Materials Science
Materials Science, Multidisciplinary
0303 Macromolecular and Materials Chemistry
General Chemistry
HYDROGEN
OXIDATION
0915 Interdisciplinary Engineering
ELECTROCHEMISTRY
MECHANISMS
Chemistry
REDUCTION
Physical Sciences
CURRENT-VOLTAGE CHARACTERISTICS
PARTIAL-PRESSURE
WATER
General Materials Science
0912 Materials Engineering
KINETICS
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi.dedup.....0b0de2e5e1867a515832b271d2538b6e