Iron–nitrogen co-doped hierarchically mesoporous carbon spheres as highly efficient electrocatalysts for the oxygen reduction reaction

Abstract

Iron and nitrogen co-doped hierarchically mesoporous carbon spheres (Fe–N–CS) were successfully prepared by using hierarchically mesoporous silica spheres as hard template.

A Unique 3D Nitrogen-Doped Carbon Composite as High-Performance Oxygen Reduction Catalyst

“…However, the presence of Fe was not detected by XPS. This confirms Fe-Nx species are not present in the catalyst, which could also act as an active site [ 31 ].…”

“…Catalysts comprised of M-Nx species as active sites showed enhanced catalytic activity with lower HO 2 − yield (less than 4) and a higher electron transfer number of 3.96 [ 33 ]. Furthermore, previous reports suggest that the ORR catalytic activity of the N-C catalysts is lower than that of Fe-N-C catalysts [ 31 ]. Since no Fe was detected by the XPS in GAL-Fe-N, the activity of GAL-Fe-N can be ascribed to the nitrogen species doped in the carbon matrix (N-C).…”

“…Since no Fe was detected by the XPS in GAL-Fe-N, the activity of GAL-Fe-N can be ascribed to the nitrogen species doped in the carbon matrix (N-C). Liu et al [ 31 ] reported that the halfwave potential of the catalysts with N-C active sites shifts more negatively than that of Fe-N-C catalysts. The negative shift of the half wave potential and relatively high HO 2 − yield confirms the active site of GAL-Fe-N is N-C.…”

Multitasking FeOCN Composite as an Economic, Heterogeneous Catalyst for 1‐Octene Hydroformylation and Hydration Reactions

“…The deconvolated region of N(1s) shows two peaks at 398.6 and 401.1 eV, which are attributed to the presence of pyridinic and graphitic nitrogen . The literature indicates that Fe 2 O 3 is well‐known for its catalytic applications for various reactions of prime importance .…”

“…[49][50][51] The deconvolated region of N(1s) shows two peaks at 398.6 and 401.1 eV, which are attributed to the presence of pyridinic and graphitic nitrogen. [52] The literature indicates that Fe 2 O 3 is well-known for its catalytic applications for various reactions of prime importance. [53][54][55] In the present case, the existence of other phases i. e. the cementite and the ferric-oxy-hydroxide may contribute to further enhancing the multitasking catalytic abilities of the material.…”