A Facile Route to Bimetal and Nitrogen‐Codoped 3D Porous Graphitic Carbon Networks for Efficient Oxygen Reduction

Abstract

Bimetal nitrogen-doped carbon with both Fe and Co, derived from the pyrolysis carbon of iron and cobalt phthalocyanine-based conjugated polymer networks, possesses a few-layer graphene-like texture with hierarchical porosity in meso/micro multimodal pore size distribution. The novel electrocatalyst exhibits Pt-like catalytic activity and much higher catalytic durability for oxygen reduction.

Biomass Derived N-Doped Porous Carbon Supported Single Fe Atoms as Superior Electrocatalysts for Oxygen Reduction

“…41-1487), attributing to the defects and impurities (i.e., N and O) originated from biocarbon structure. [19] It is worth noting that the NP-Fe/NHPC sample exhibits a set of tiny but obvious peaks at 43.7°, 44.9°, and 48.6°, attributable to the iron carbide (Fe 3 C, JCPDS card: no. 35-0772), but not for SA-Fe/ NHPC.…”

“…[38] As the pyrolysis temperature increases, the metalO (531.6 eV) and CO (533.2 eV) bonding become apparent. [19,39] The various oxygen moieties are attributable to the incorporation of the chemically and physically adsorbed oxygen, which can enhance the catalytic activity during the ORR process. [40] We performed X-ray absorption fine structure (XAFS) measurements to identify the single-atomic dispersion of Fe atoms.…”

“…[14][15][16] Decreasing the nanoparticle size to the atomic scale, the single transition metal atoms with unsaturated-coordination often function as the catalytically active sites for ORR (e.g., Fe-N x -C y and Co-N x -C y moieties). [14,[17][18][19] However, due to the high surface free energy, these metal atoms tend to grow up into small clusters, leading to the decrease of specific activity per metal atom. Therefore, it is necessary to prevent the aggregation of metal atoms and enhance the interactions of metal atoms with heteroatoms for the single-atom catalysts (SACs).…”

In Situ Coupling Strategy for the Preparation of FeCo Alloys and Co4N Hybrid for Highly Efficient Oxygen Evolution

“…Previously, phthalocyanine/porphyrin-like macrocycles have been widely studied as prospective scaffolds for the construction of nonprecious electrocatalysts for the oxygen reduction reaction (ORR), [26,27] whereas their application in the synthesis of high-performance OER catalysts is rarely reported. [28] The porous nature was further revealed by the nitrogen adsorption-desorption experiments at 77 K, and a Brunauer-Emmett-Teller surface area of 82 m 2 g −1 was achieved ( Figure S2, Supporting Information). High content of Fe and Co (1.1 and 1.6 wt%) was indicated by the inductively coupled plasma optical emission spectrometry (ICP-OES), respectively.…”

“…We therefore employed highresolution X-ray photoelectron spectroscopy (XPS) analysis for Fe 2p and Co 2p to study the surface chemistry of FeCo-Co 4 N/N-C ( Figure S7, Supporting Information). [28] As a proof of concept, we studied the OER activity on FeCo-Co 4 N/N-C in an O 2 -saturated 1 m KOH using the typical rotating disc electrode approach. [31][32][33] Two peaks at 710.2 and 714.0 eV can be assigned to the binding energies of the 2p 3/2 orbitals of Fe 2+ and Fe 3+ species, respectively.…”