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Effect of Ru Substitution in La 0.85 Sr 0.15 CoO 3 towards Oxygen Evolution Reaction: Activity of Ionic Ru
Author(s) -
Vats Vishal,
Singhal Aditi
Publication year - 2021
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.202060079
Subject(s) - tafel equation , ruthenium , oxygen evolution , catalysis , exchange current density , electrochemistry , cobalt , oxygen , chemistry , inorganic chemistry , doping , ionic bonding , nuclear chemistry , materials science , ion , electrode , organic chemistry , biochemistry , optoelectronics
Nano crystalline La 0.85 Sr 0.15 CoO 3 and ruthenium doped compounds (La 0.85 Sr 0.15 Co 0.9975 Ru 0.0025 O 3, La 0 . 85 Sr 0.15 Co 0.995 Ru 0.005 O 3, La 0.85 Sr 0.15 Co 0.99 Ru 0.01 O 3 ) are synthesized using solution combustion method. Completely characterized samples are studied for electrochemical OER in neutral and basic medium. Significant enhancement in catalytic activity is noticed once Ru is substituted in the cobalt site. With higher doping level of Ru, capacitance also increases as depicted in the CV behavior. Tafel slope measurements indicate that Ru substitution has profound effect as enhancement in the exchange current density is observed in neutral K 2 SO 4 medium. Enhancement is anticipated due to substitution of Ru, as the RuO 2 mixed catalyst does not give similar activity.