Synthesis of Fe3C@C core-shell catalysts with controlled shell composition for robust oxygen evolution reaction

Preparation of Nx−Fe/Fe3C/KVO3 composites by heat treatment for high‐performance electrocatalytic oxygen evolution

“…Meanwhile, from the spectrum of N 1s (Figure 4f), it is seen that the binding energy of 397.46 eV is consistent with that of the C−N bond in prussian blue framework analogues [24] . Furthermore, the peaks at the binding energies of 399.08 and 400.77 eV are attributed to the pyridinic‐N and pyrrolic‐N, respectively, suggesting that the nitrogen atoms are coordinated with the carbon [11–13,17,19,51] . The spectrum O 1s peak (Figure 4g) shows that the binding energy peaks at 530.39 and 532.00 eV can be attributed to V−O and C−O & C=O [18,54,56–58] .…”

“…[24] Furthermore, the peaks at the binding energies of 399.08 and 400.77 eV are attributed to the pyridinic-N and pyrrolic-N, respectively, suggesting that the nitrogen atoms are coordinated with the carbon. [11][12][13]17,19,51] The spectrum O 1s peak (Figure 4g) shows that the binding energy peaks at 530.39 and 532.00 eV can be attributed to VÀ O and CÀ O & C=O. [18,54,[56][57][58] Based on the above results, it can be found that elements such as N, V and O in the samples are both bound to C, because the carbon in the Prussian blue framework as the precursor is connected to these elements even after heat treatment.…”

“…The OER activity of Fe 3 C@CÀ N is 1.7 V vs. RHE at 10 mA ⋅ cm À 2 , and this core-shell carbide has substantial stability under alkaline conditions. [17] Liang et al fabricated highly dispersed Fe/Fe 3 C nanoparticles anchoring on carbon matrix via the co-electroreduction of Fe 2 O 3 and CO 2 in molten carbonates at 600 °C. The overpotential of Fe/Fe 3 CÀ MC is only 320 mV to drive a current density of 10 mA ⋅ cm À 2 .…”

“…encapsulated iron carbide (Fe 3 C) particles in graphite carbon shells by easy carbonization method. The OER activity of Fe 3 C@C−N is 1.7 V vs. RHE at 10 mA ⋅ cm −2 , and this core‐shell carbide has substantial stability under alkaline conditions [17] . Liang et al.…”

Chemical and electrochemical synthesis of cobalt hydroxides: selective phase transformation and application to distinct electrocatalytic reactions

“…4b), indicating that the reaction kinetics of the catalysts in the OER followed the same trend as the current density. 44 The R ct value of γ-CoOOH is smaller than that of β-CoOOH, indicating fast charge transport of γ-CoOOH during the OER (Fig. 4c), which causes efficient OER activity on the γ-CoOOH surface.…”