PH Transitions and electrochemical behavior during the synthesis of iron oxide nanoparticles with gas-diffusion electrodes.

ABSTRACT: Gas diffusion electrocrystallization (GDEx) was explored for the synthesis of iron oxide nanoparticles (IONPs). A gas-diffusion cathode was employed to reduce oxygen, producing hydroxyl ions (OH^-) and oxidants (H₂O₂ and HO₂ ^-), which acted as reactive intermediates for the formation of stable IONPs. The IONPs were mainly composed of pure magnetite. However, their composition strongly depended on the presence of a weak acid, i.e., ammonium chloride (NH₄Cl), and on the applied electrode potential. Pure magnetite was obtained due to the simultaneous action of H₂O₂ and the buffer capacity of the added NH₄Cl. Magnetite and goethite were identified as products under different operating condi

SUBMITTER: Burgos-Castillo RC 

PROVIDER: S-EPMC9419531 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature