Open AccessEnhanced Catalytic Performance of Strontium-Doped Lanthanum Manganites by the Presence of Molybdenum Oxides for Electro-Reduction of Hydrogen Peroxide
Author(s) -
L. Stanley Kenin Xavier,
Therese Cibaka Ebambi,
Renata Diniz,
Vanessa de Freitas Cunha Lins,
Luciano A. Montoro,
Túlio Matencio
Publication year - 2022
Publication title -
journal of the brazilian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.337
H-Index - 70
eISSN - 1678-4790
pISSN - 0103-5053
DOI - 10.21577/0103-5053.20220016
Subject(s) - catalysis , cyclic voltammetry , inorganic chemistry , materials science , dielectric spectroscopy , hydrogen peroxide , lanthanum , polarization (electrochemistry) , molybdenum , electrochemistry , strontium , cathode , anode , hydrogen , electrode , chemistry , biochemistry , organic chemistry
In this work, two catalysts, lanthanum manganite strontium-doped perovskite without (LSM) and with (LSMMO) mixed molybdenum oxides, were synthesized by the sol-gel route and deposited by immersion in carbon cloth substrates. Their performance as cathodes in the hydrogen peroxide reduction reaction (HPRR) and oxygen reduction reaction (ORR) was investigated through cyclic voltammetry and electrochemical impedance spectroscopy, the electrocatalytic efficiency of these electrodes in the HPRR was analyzed in KOH and H2O2 medium at 298 K. The performance of the cathodes, in a single compartment, using a nickel plate as an anode was also investigated. The results showed that for the reduction reactions, electrodes developed with LSMMO have more significant catalytic activity than LSM after polarization, resulting in 32% higher current densities, lower electrical resistance after polarization, and a 21% increase in power density.