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Ce 0.8 Sr 0.2 Co x Fe 1‐x O 3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media
Author(s) -
Njoku C. B.,
Doyle B. P.,
Carleschi E.,
Kriek R. J.
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060370
Subject(s) - tafel equation , overpotential , perovskite (structure) , electrochemistry , oxygen evolution , analytical chemistry (journal) , materials science , nuclear chemistry , chemistry , inorganic chemistry , crystallography , electrode , chromatography
Three perovskite‐type nanocomposites, i. e. Ce 0.8 Sr 0.2 Co x Fe 1‐x O 3‐δ (x=0.2, CSCF1; 0.5, CSCF2; 0.8, CSCF3), were synthesized employing the sol‐gel technique, subsequent to which they were physically and electrochemically evaluated for their electrocatalytic activity towards the oxygen evolution reaction (OER) in alkaline medium (0.1 M KOH) at room temperature (25 °C). Electrochemical characterisation revealed Ce 0.8 Sr 0.2 Co 0.8 Fe 0.2 O 3‐δ (CSCF3) to be the most active having the lowest overpotential at 10 mA cm −2 (440 mV), the lowest Tafel slope (40.7 mV dec −1 ), the highest mass activity (20.11 mA mg −1 ) and highest specific activity (2.22 mA cm −2 ).