Influence of intrinsic spin ordering in La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- δ and Ba 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- δ towards electrocatalysis of oxygen redox reaction in solid oxide cell.

Autor: Dey S; Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India jmukhopadhyay75@gmail.com jayanta_mu@cgcri.res.in.; Academy of Scientific and Innovative Research (AcSIR) Gaziabad 201002 India., Saravanan R; Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India jmukhopadhyay75@gmail.com jayanta_mu@cgcri.res.in., Hati S; Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India jmukhopadhyay75@gmail.com jayanta_mu@cgcri.res.in., Goswami S; Department of Chemistry, Amity Institute of Applied Sciences, Amity University Kolkata 700135 India sgoswami423@gmail.com., Suresh A; School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India., Jaiswal-Nagar D; School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India., Ghosh M; Department of Physics, Basic Science & Humanities, Institute of Engineering and Management (IEM), University of Engineering and Management Newtown Kolkata West Bengal 700160 India., Paul S; Department of Chemistry, Bangabasi Morning College Kolkata 700009 West Bengal India., Bhattacharya A; Department of Physics, The Bhawanipur Education Society College, University of Calcutta 700020 Kolkata India., Mukhopadhyay M; School of Chemistry, University of St Andrews St Andrews Fife KY16 9ST UK madhubanerji@gmail.com mm613@st-andrews.ac.uk., Mukhopadhyay J; Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India jmukhopadhyay75@gmail.com jayanta_mu@cgcri.res.in.; Academy of Scientific and Innovative Research (AcSIR) Gaziabad 201002 India.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 Sep 25; Vol. 14 (42), pp. 30590-30605. Date of Electronic Publication: 2024 Sep 25 (Print Publication: 2024).
DOI: 10.1039/d4ra05191b
Abstrakt: The redox reaction of oxygen (OER & ORR) forms the rate determining step of important processes like cellular respiration and water splitting. Being a spin relaxed process governed by quantum spin exchange interaction, QSEI (the ground triplet state in O 2 is associated with singlet oxygen in H 2 O/OH - ), its kinetics is sluggish and requires inclusion of selective catalyst. Functionality and sustainability of solid oxide cell involving fuel cell (FC) and electrolyzer cell (EC) are also controlled by ORR (oxygen redox reaction) and OER (oxygen evolution reaction). We suggest that, presence of inherent spin polarization within La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- δ (LSCF6482) (15.86 emu g -1 ) and Ba 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- δ (BSCF6482) (3.64 emu g -1 ) accounts for the excellent selective electrocatalysis towards ORR and OER. QSEI forms the atomic level basis for OER/ORR which is directly proportional to spin ordering (non-zero magnetization) of the active electrocatalyst. LSCF6482 exhibits (21.5 kJ mol -1 @0.8 V for ORR compared to 61 kJ mol -1 @0.8 V for OER) improved ORR kinetics whereas BSCF6482 (18.79 kJ mol -1 @0.8 V for OER compared to 32.19 kJ mol -1 for ORR@-0.8 V) is best suited for OER under the present stoichiometry. The findings establish the presence of inherent spin polarization of catalyst to be an effective descriptor for OER and ORR kinetics in solid oxide cell (SOC).
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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