Enhancing the electrocatalytic activity of Fe phthalocyanines for the oxygen reduction reaction by the presence of axial ligands: Pyridine-functionalized single-walled carbon nanotubes

Electrochemical Sensor Based on Iron(II) Phthalocyanine and Gold Nanoparticles for Nitrite Detection in Meat Products

“…The Fe 2p spectra consist of two peaks: one asymmetric peak at around 711 eV, which come from the electrons at the Fe 2p 3/2 level, and another, less intense peak at approximately 724 eV, which come from Fe 2p 1/2 electrons. The fitting components at 709.9 and 723.1 eV are assigned to Fe 2+ [ 44 ]. The low intense lines at 712.3 and 725.2 eV may be due to a decrease in electron density around the Fe atom; this is because of the delocalization of the π-electron system during the adsorption of FePc(tBu) 4 on the GCE matrix [ 45 ].…”

Theoretical study of the effect of coordination environment on the activity of metal macrocyclic complexes as electrocatalysts for oxygen reduction

“…We roughly revise the volcano plot by moving the right part down, as shown in the gray points and line in Figure 7 . Then one can still infer that these points between or close to Fe-PP and Co-PP (in the shadow area of Figure 7 ) are promising electrocatalysts for ORR, including not only the synthesized systems (Fe-PP-Py ( Cao et al., 2013 ; Loyola et al., 2021a , 2021b ), Fe-PP-OH ( Wang et al., 2019 ) Co-PP-Py ( Riquelme et al., 2018 ; Viera et al., 2020 ; Govan et al., 2021 ) and substituted Fe-PP ( Abarca et al., 2019 ; Govan et al., 2020 ; Oyarzun et al., 2021 ), but also some hypothesized models, such as Co-N3O and Ni-N2O2-cis. We expect experimental chemists to prepare these structures and test the performance in the future.…”

“…Previously, Tasca et al. ( Cao et al., 2013 ; Riquelme et al., 2018 ; Viera et al., 2020 ; Loyola et al., 2021a , 2021b ; Govan et al., 2021 ; Oyarzun et al., 2021 ) systematically studied similar Fe-centered and Co-centered complexes with axial ligands by combining experiments and theoretical calculation. They also demonstrated that the additional coordination promotes the overall ORR performance.…”

“…Introducing substituent is another common strategy to modulate the properties of the macrocycle ( Wannakao et al., 2017 ; Abarca et al., 2019 ; Govan et al., 2020 ; Oyarzun et al., 2021 ). Here, we considered four substituents on the pyrrole subunits, i.e., -F, -Cl, -Br, and -CH 3 (the green groups in Figure 1 A).…”

A simple decagram-scale synthesis of an atomically dispersed, hierarchically porous Fe–N–C catalyst for acidic ORR

“…28 Second, the materials must be synthesized reproducibly and in large quantity, to enable extensive fundamental investigations and to allow for commercial scale-up. Most current syntheses of Fe-N-C SACs yield catalytic powders on the ten milligram scale, 12,18,20,21,[29][30][31][32][33][34][35][36] whereas a hundred gram scale is needed to power automotive fuel cell stacks at current performance levels. [37][38][39] Large scale syntheses of Fe-N-C materials have been reported recently, 40,41 albeit relying on commercial activated carbons, rich in micropores yet lacking signicant owenhancing meso-or macroporosity.…”