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Some Attributes of Mn 3+ Sites in Nickel‐Based Layered Double Hydroxides during Methanol Electro‐oxidation in Alkaline Media
Author(s) -
OliverTolentino Miguel A.,
RamosSánchez Guadalupe,
ManzoRobledo Arturo,
RamírezRosales Daniel,
FloresMoreno Jorge L.,
Lima Enrique,
GuzmánVargas Ariel
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701093
Subject(s) - hydrotalcite , layered double hydroxides , nickel , electrochemistry , chemistry , methanol , inorganic chemistry , manganese , catalysis , nuclear chemistry , hydroxide , electrode , biochemistry , organic chemistry
Ni‐based layered double hydroxides (LDHs), or hydrotalcite‐like materials (HTs), were synthetized through co‐precipitation at constant pH (NiAl and NiMg) and urea hydrolysis (NiMn) methods, and they were tested in the electrochemical methanol oxidation (MOR). The physicochemical properties were explored by using techniques such as X‐ray diffraction, FT‐IR spectroscopy, as well as electron paramagnetic resonance. In addition, correlation between active site arrangements and electrocatalytic activity was evidenced by density functional calculations. Specific site μ(Ni 2 Mn‐OH) showed the lowest proton energy removal at approximately 3.6 eV and the NiMn LDH sample containing a higher proportion of this site exhibited the best performance for the MOR process, with an enhancement factor of 5.16, which is attributed to limited deactivation of Ni during the reaction. CO 2 production was detected by differential electrochemical mass spectrometry to be on the order of ten times greater than O 2 .