Dey, Shoroshi and Das, Suman and Chaudhary, Saroj and Parvatalu, Damaraju and Mukhopadhyay, Madhumita and Paul, Satadal and Das Sharma, Abhijit and Mukhopadhyay, Jayanta (2023) Advancing insights towards electrocatalytic activity of La/ Ba-Sr-Co-Fe-O-based perovskites for oxygen reduction & evolution process in reversible solid oxide cell. Scripta Materialia, 229. Art No-115380. ISSN 1359-6462

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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 AEFMO(Absolute) 1.75 eV in LSCF accounts for higher charge transfer. Amperometric measurements @800celcius 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 l.cm2 and 0.081 l.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.

Item Type:	Article
Subjects:	Electronics
Divisions:	Fuel Cell and Battery
Depositing User:	Bidhan Chaudhuri
Date Deposited:	05 Oct 2023 09:53
Last Modified:	05 Oct 2023 09:53
URI:	http://cgcri.csircentral.net/id/eprint/5565

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