uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Maneuvering the Physical Properties and Spin States To Enhance the Activity of La-Sr-Co-Fe-O Perovskite Oxide Nanoparticles in Electrochemical Water Oxidation
IISER, Dept Chem Sci, Kolkata 741246, Mohanpur, India;IISER, Ctr Adv Funct Mat, Kolkata 741246, Mohanpur, India.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-6765-2084
Bhabha Atom Res Ctr, Tech Phys Div, Mumbai 400085, Maharashtra, India.
IISER, Dept Chem Sci, Kolkata 741246, Mohanpur, India;IISER, Ctr Adv Funct Mat, Kolkata 741246, Mohanpur, India.
2018 (English)In: ACS APPLIED ENERGY MATERIALS, ISSN 2574-0962, Vol. 1, no 7, p. 3342-3350Article in journal (Refereed) Published
Abstract [en]

Perovskite oxides have attracted considerable attention as durable electrocatalysts for metal-air batteries and fuel cells due to their precedence in oxygen electrocatalysis in spite of the complexities involved with their crystal structure, spin states, and physical properties. Here we report optimization of the activity of a model perovskite system La1-xSrxCo1-yFeyO3-delta (LSCF; x = 0.301, y = 0.298, and (delta = 0.05-0.11) toward electrochemical water oxidation (OER) by altering the calcination temperature of the nonaqueous sol-gel synthesized nanoparticles (NPs). Our results show that improved OER activity is the result of a synergism between its morphology, surface area, electrical conductivity, and spin state of the active transition metal site. With an e(g) orbital occupancy of 1.26, the interconnected similar to 90 nm LSCF NPs prepared at 975 degrees C (LSCF-975) outperforms the other distinguishable LSCF morphologies, requiring 440 mV overpotential to achieve 10 mA/cm(2), a performance comparable to the best-performing perovskite oxide electrocatalysts. While the interconnected NP morphology increases the propensity of electronic conduction across crystalline grain boundaries, the morphology-tuned high spin Co3+ ions increases the probability of binding reaction intermediates at the available surface sites. Density functional theory based work function modeling further demonstrates that LSCF-975 is the most favorable OER catalyst among others in terms of a moderate work function and Fermi energy level facilitating the adsorption and desorption of reaction intermediates.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 1, no 7, p. 3342-3350
Keywords [en]
perovskite oxide, nanoparticles, water oxidation, morphology, spin state
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-377985DOI: 10.1021/acsaem.8b00531ISI: 000458706000039OAI: oai:DiVA.org:uu-377985DiVA, id: diva2:1293399
Available from: 2019-03-04 Created: 2019-03-04 Last updated: 2019-03-04Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Chakraborty, Sudip

Search in DiVA

By author/editor
Chakraborty, Sudip
By organisation
Materials Theory
Materials Chemistry

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 4 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf