Advancing Insights towards Electrocatalytic Activity of La/Ba-Sr-Co-Fe-O-based Perovskites for Oxygen Reduction & Evolution Process in Reversible Solid Oxide Cell.

Shoroshi  Dey; Suman Das; Saroj Chaudhary; Damaraju  Parvatalu; Madhumita Mukhopadhyay; Satadal Paul; Abijit Das Sharma; Jayanta Mukhopadhyay

doi:10.1016/j.scriptamat.2023.115380

Advancing Insights towards Electrocatalytic Activity of La/Ba-Sr-Co-Fe-O-based Perovskites for Oxygen Reduction & Evolution Process in Reversible Solid Oxide Cell.

Shoroshi Dey, Suman Das, Saroj Chaudhary, Damaraju Parvatalu, Madhumita Mukhopadhyay, Satadal Paul, Abijit Das Sharma^*, Jayanta Mukhopadhyay^*

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Electrocatalytic activity of La/Ba-Sr-Co-Fe-O-based mixed ionic and electronically conducting (MIEC) perovskites has been studied for selective oxygen reduction (ORR) and evolution (OER) processes applicable in Reversible Solid Oxide Cell (R-SOC). XPS study establishes scavenging of oxygen vacancy in LSCF and generation of the same in BSCF. BSCF enables faster oxygen ion transport and is correlated with lower frontier molecular orbital (FMO) energy gap of 1.18 eV derived from density functional theory (DFT). Relatively higher ΔEFMO(Absolute) 1.75 eV in LSCF accounts for higher charge transfer. Amperometry measurements @800℃ in asymmetric cell configuration exhibit lowest time-dependent current loss of 0.019 mA.h-1 & 0.035 mA.h-1 for BSCF & LSCF under applied anodic (+0.8 V) and cathodic potentials (-0.8 V) for 200 h with respective surface resistances (Rs) of 0.19 Ω.cm2 and 0.081 Ω.cm2. H2 flux of 0.4Nl.h-1.cm-2 obtained with BSCF, establishes its effectivity as OER whereas LSCF is found to be more selective in ORR.

Original language	English
Pages (from-to)	115380 (1.
Number of pages	115380
Journal	Scripta Materialia
Volume	229
DOIs	https://doi.org/10.1016/j.scriptamat.2023.115380
Publication status	Published - May 2023

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@article{702106a0eec54e339b936bb08f1d6eca,

title = "Advancing Insights towards Electrocatalytic Activity of La/Ba-Sr-Co-Fe-O-based Perovskites for Oxygen Reduction & Evolution Process in Reversible Solid Oxide Cell.",

abstract = "Electrocatalytic activity of La/Ba-Sr-Co-Fe-O-based mixed ionic and electronically conducting (MIEC) perovskites has been studied for selective oxygen reduction (ORR) and evolution (OER) processes applicable in Reversible Solid Oxide Cell (R-SOC). XPS study establishes scavenging of oxygen vacancy in LSCF and generation of the same in BSCF. BSCF enables faster oxygen ion transport and is correlated with lower frontier molecular orbital (FMO) energy gap of 1.18 eV derived from density functional theory (DFT). Relatively higher ΔEFMO(Absolute) 1.75 eV in LSCF accounts for higher charge transfer. Amperometry measurements @800℃ in asymmetric cell configuration exhibit lowest time-dependent current loss of 0.019 mA.h-1 & 0.035 mA.h-1 for BSCF & LSCF under applied anodic (+0.8 V) and cathodic potentials (-0.8 V) for 200 h with respective surface resistances (Rs) of 0.19 Ω.cm2 and 0.081 Ω.cm2. H2 flux of 0.4Nl.h-1.cm-2 obtained with BSCF, establishes its effectivity as OER whereas LSCF is found to be more selective in ORR.",

author = "Shoroshi Dey and Suman Das and Saroj Chaudhary and Damaraju Parvatalu and Madhumita Mukhopadhyay and Satadal Paul and {Das Sharma}, Abijit and Jayanta Mukhopadhyay",

year = "2023",

month = may,

doi = "10.1016/j.scriptamat.2023.115380",

language = "English",

volume = "229",

pages = "115380 (1.",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier",

}

TY - JOUR

T1 - Advancing Insights towards Electrocatalytic Activity of La/Ba-Sr-Co-Fe-O-based Perovskites for Oxygen Reduction & Evolution Process in Reversible Solid Oxide Cell.

AU - Dey, Shoroshi

AU - Das, Suman

AU - Chaudhary, Saroj

AU - Parvatalu, Damaraju

AU - Mukhopadhyay, Madhumita

AU - Paul, Satadal

AU - Das Sharma, Abijit

AU - Mukhopadhyay, Jayanta

PY - 2023/5

Y1 - 2023/5

N2 - Electrocatalytic activity of La/Ba-Sr-Co-Fe-O-based mixed ionic and electronically conducting (MIEC) perovskites has been studied for selective oxygen reduction (ORR) and evolution (OER) processes applicable in Reversible Solid Oxide Cell (R-SOC). XPS study establishes scavenging of oxygen vacancy in LSCF and generation of the same in BSCF. BSCF enables faster oxygen ion transport and is correlated with lower frontier molecular orbital (FMO) energy gap of 1.18 eV derived from density functional theory (DFT). Relatively higher ΔEFMO(Absolute) 1.75 eV in LSCF accounts for higher charge transfer. Amperometry measurements @800℃ in asymmetric cell configuration exhibit lowest time-dependent current loss of 0.019 mA.h-1 & 0.035 mA.h-1 for BSCF & LSCF under applied anodic (+0.8 V) and cathodic potentials (-0.8 V) for 200 h with respective surface resistances (Rs) of 0.19 Ω.cm2 and 0.081 Ω.cm2. H2 flux of 0.4Nl.h-1.cm-2 obtained with BSCF, establishes its effectivity as OER whereas LSCF is found to be more selective in ORR.

AB - Electrocatalytic activity of La/Ba-Sr-Co-Fe-O-based mixed ionic and electronically conducting (MIEC) perovskites has been studied for selective oxygen reduction (ORR) and evolution (OER) processes applicable in Reversible Solid Oxide Cell (R-SOC). XPS study establishes scavenging of oxygen vacancy in LSCF and generation of the same in BSCF. BSCF enables faster oxygen ion transport and is correlated with lower frontier molecular orbital (FMO) energy gap of 1.18 eV derived from density functional theory (DFT). Relatively higher ΔEFMO(Absolute) 1.75 eV in LSCF accounts for higher charge transfer. Amperometry measurements @800℃ in asymmetric cell configuration exhibit lowest time-dependent current loss of 0.019 mA.h-1 & 0.035 mA.h-1 for BSCF & LSCF under applied anodic (+0.8 V) and cathodic potentials (-0.8 V) for 200 h with respective surface resistances (Rs) of 0.19 Ω.cm2 and 0.081 Ω.cm2. H2 flux of 0.4Nl.h-1.cm-2 obtained with BSCF, establishes its effectivity as OER whereas LSCF is found to be more selective in ORR.

U2 - 10.1016/j.scriptamat.2023.115380

DO - 10.1016/j.scriptamat.2023.115380

M3 - Article

SN - 1359-6462

VL - 229

SP - 115380 (1.

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Advancing Insights towards Electrocatalytic Activity of La/Ba-Sr-Co-Fe-O-based Perovskites for Oxygen Reduction & Evolution Process in Reversible Solid Oxide Cell.

Abstract

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