Fe₂O₃ Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction

Abstract

As the high expense and poor stability of Pt-based catalysts have severely limited the commercial applications of cathodic catalysts in fuel cells, the steps towards developing low-cost and stable catalysts for oxygen reduction reaction (ORR) have never stopped. In this work, we designed a Fe 2 O 3 nanoparticles decorated 2D N-doped porous graphene-like carbon material (Fe(1.0)-N/C-800) from the one-step pyrolysis of low-cost and abundant substrates (β-cyclodextrin, urea and FeCl 3 ) under N 2 atmosphere. The doped N can change the charge distribution of C atoms around N atoms and offer active N species such as pyridinic-N and graphitic-N to provide more ORR active sites. The appropriate Fe 2 O 3 nanoparticles encapsulated in the graphene-like carbon layer can enhance the electron and O 2 transfer and boost the ORR process. Therefore, the synergetic effect of Fe 2 O 3 nanoparticles modifying and N doping can greatly promote the ORR process. The study on the poisoning of Fe 3 + by SCNfurther reveals that the Fe 2 O 3 nanoparticles wrapped in the carbon layer will coordinate with N to form Fe-N x active sites, which can further enhance ORR activity. Thus, the obtained Fe(1.0)-N/C-800 electrocatalyst possesses excellent ORR catalytic performance in alkaline media (E onset = 0.937 V, E 1/2 = 0.832 V) as well as a superior methanol tolerance and long-term test stability both in alkaline and acidic media. This work leads a simple and cost-efficient way to fabricate high-performance ORR catalysts.

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

“…The peak at 708.3 eV could be consistent with the FeÀ Nx species [9,36] . The pair of Fe 2p 3/2 (∼ 711.2 eV)/Fe 2p 1/2 (∼ 724.4 eV) and Fe 2p 3/2 (∼ 711.2 eV)/Fe 2p 1/2 (∼ 724.4 eV) were ascribed to Fe 2 + and Fe 3 + [23,[37][38][39] , respectively. Finally, XPS survey spectra (Figure5d and Table S2) of Fe-CNTs/ NC revealed that the main elements are iron, nitrogen, carbon, oxygen and little negligible zinc.…”

Surface-Confined Destruction of Pollutants with H2O2 Assistance over Cu0@CuOx-N-Graphitic Carbon Suspensions

“…18,19 2D N-doped porous graphene-like carbon material-encapsulated Fe 2 O 3 nanoparticles were prepared by β-CD, and the electron transfer to O 2 was enhanced, boosting the oxygen reduction reaction process, which was contributed to the graphene high performance for both storage and transfer of electrons. 20,21 In this work, Cu 0 @CuO x -encapsulated nitrogen-doped graphitized carbon (Cu 0 @CuO x -NC) was prepared by the one-step pyrolysis of low-cost and abundant substrates, β-CD, urea, and CuCl…”

“…The efficient adsorption ability of β-CD to some appropriate molecules is attributed to its hydrophilic group hydroxyl group, which readily forms coordination complexes with excess metals. , Moreover, molecules of appropriate size and shape can enter the cavity to form inclusion compounds through host–guest interactions . For example, β-CD has been used to complex iron and copper oxides by Fe­(Cu)–O–C, enhancing M n + /M ( n + m )+ cycling and the interaction of organic pollutants with the catalysts, causing higher Fenton-like efficiency. , 2D N-doped porous graphene-like carbon material-encapsulated Fe 2 O 3 nanoparticles were prepared by β-CD, and the electron transfer to O 2 was enhanced, boosting the oxygen reduction reaction process, which was contributed to the graphene high performance for both storage and transfer of electrons. , …”

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

“…Modified carbon materials, such as carbon nanotubes, graphene and mesoporous carbons with unique physical and chemical properties after doping with heteroatoms, have drawn intensive interest for their excellent performances in ORR catalysis [10][11][12][13]. Among the generally doped foreign atoms, nitrogen could not only alter the electronic property and crystal structure of catalysts, but also prominently transform the chemical stability, surface polarity and electron-donor properties of the carbon materials, which effectively promoted the ORR catalysis [14].…”