Highly active and stable non noble metal catalyst for oxygen reduction reaction

Yolk–Shell Fe/Fe4N@Pd/C Magnetic Nanocomposite as an Efficient Recyclable ORR Electrocatalyst and SERS Substrate

“…The pair of Fe 2p 3/2 (712.1 eV) and Fe 2p 1/2 (725.4 eV) with a satellite peak at 731.7 eV is assigned to be Fe 3+ and the pair of Fe 2p 3/2 (711.5 eV) and Fe 2p 1/2 (723.8 eV) with a satellite peak at 716.4 eV could be indexed into Fe 2+ . The peaks at 707.1 and 711.5 eV demonstrate the presence of Fe–N x species . Besides, the peaks at 708.2 eV (Fe 2p 3/2 ) and 720.4 eV (Fe 2p 1/2 ) indicate the existence of Fe 0 , which is in accord with XRD results.…”

“…It can be concluded that Fe 3 O 4 was transformed to main iron and a little roaldite gradually and until calcination for 10 h, the peaks of magnetite disappeared completely. With H 2 existing, the N atoms from PDA were slowly incorporated into the lattice of iron to form Fe 4 N phase, which can protect Fe cores to some extent from the corrosion of alkaline electrolyte (Figure S5, Supporting Information). Because the quantity of N atoms was little, only a small fraction of iron turned into the Fe 4 N phase.…”

Michael-Type Addition of Gelatin on Electrospun Nanofibrils for Self-Assembly of Cell Sheets Composed of Human Dermal Fibroblasts

“…As shown in a previous study, XPS peaks at approximately 286 eV, indicative of C–N and C–O bonding, do not appear clearly separated. 42 Similarly, peaks corresponding to C–O and C–N bonds appear at 285.5 and 286.2 eV, respectively, with nearly no difference in the binding energy. 43 XPS high-resolution spectra for C 1s were used to evaluate the ratio of peak areas of C–O/C–N bonds normalized to those of C–C/C–H (284.58 eV) (Figure 3C).…”

Structural Advantage Induced by Zinc Gluconate: Hierarchically Porous Carbon with In‐Situ Growth Iron‐Inside Carbon Nanotubes for Efficient Oxygen Reduction Reaction

“…Among a wide variety of nonprecious metal-based catalysts, transition metal catalyst, especially iron dispersed on nitrogendoped carbon (FeÀ NÀ C) electrocatalysts are the most promising candidates to replace Pt-based ORR catalysts. [8][9][10][11] At present, the synthesis strategy of FeNC catalyst generally involves high-temperature pyrolysis of precursors containing iron and nitrogen to form as many active sites (eg: FeN x , [12,13] Fe 3 C [14,15] ) as possible during carbonization. However, Fe species unavoidably tend to agglomerate and eventually form metal clusters and other invalid active sites, which make the availability of iron atoms will be seriously reduced.…”