Nanostructured Cementite/Ferrous Sulfide Encapsulated Carbon with Heteroatoms for Oxygen Reduction in Alkaline Environment

Abstract

Nonprecious metal catalysts of the oxygen reduction reaction (ORR) are highly preferred in anion exchange membrane fuel cells (AEMFCs) because of the high stability and low cost. Here, a novel pyrolyzed poly(3,4ethylene dioxythiophene) hydrate (PEDOT)-Prussian blue (PB) catalyst (FeCN-S) for the ORR in an AEMFC cathode demonstrated high catalytic performance. After pyrolysis at 800 °C, the templated PB-PEDOT formed the nanostructured Fe 3 C/FeS encapsulated carbon with heteroatom contribution, which exhibited optimized ORR activity with a direct fourelectron transfer pathway for AEMFC applications. This improvement in activity is attributed to the specific structure, the heteroatom contribution, and the coordination structure.

A facile synthesis of FeS/Fe3C nanoparticles highly dispersed on in situ grown N-doped CNTs as cathode electrocatalysts for microbial fuel cells

“…2(f)) shows the lattice edges of 0.200 nm and 0.209 nm, corresponding to Fe 3 C (031) and FeS (114) lattice planes, respectively. 47 This confirms that the nanoparticles are the composite of FeS/Fe 3 C, which will be beneficial for the synergistic effect between Fe 3 C and FeS. In addition, elemental mapping (Fig.…”

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS2Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

“…5 Huang et al successfully prepare the nanostructured Fe 3 C/FeS-encased carbon with heteroatomic contributions using the poly(3,4-ethylene dioxythiophene) hydrate (PEDOT)-Prussian blue (PB) as templates, which shows a high ORR activity. 15 Wen et al successfully prepare a new type of iron disulfide (FeS 2 )/ reduced graphene oxide composite using a simple one-pot hydrothermal process, which provides the smooth diffusion pathways for timely transport of electrons and reactants for ORR electrocatalysis. 16 Zang et al fabricate the yolk−shell Ndoped carbon-coated FeS 2 nanocages (PFS@NC) via a simple thermal sulfurization of polypyrrole-coated PB precursors.…”

“…In recent years, many kinds of non-noble-metal-based catalysts such as transition metal sulfides (TMSs) have been widely studied in electrocatalysis. ,− Ju et al propose an amine-mediated one-step technique for the synthesis of flimsy cobalt sulfide (CoS 2 ) nanoflakes for electrocatalysis by using sulfur powder and CoCl 2 as precursors . Li et al prepare the bifunctional electrocatalysts of Co 9 S 8 /carbon (Co 9 S 8 /C) nanosheets by using Co 3 O 4 /C and sodium sulfide as precursors, which possess the two-dimensional nanosheet structure and abundant active centers to obtain an excellent ORR activity (onset potential ( E onset ) = 0.892 V and half-wave potential ( E 1/2 ) = 0.778 V, vs reversible hydrogen electrode, RHE) .…”

“…Huang et al use a one-pot hydrothermal method to synthesize the cubic NiS 2 catalysts with high purity, which shows a better peak current density and long-term running stability than Pt/C for the ORR . Huang et al successfully prepare the nanostructured Fe 3 C/FeS-encased carbon with heteroatomic contributions using the poly­(3,4-ethylene dioxythiophene) hydrate (PEDOT)-Prussian blue (PB) as templates, which shows a high ORR activity . Wen et al successfully prepare a new type of iron disulfide (FeS 2 )/reduced graphene oxide composite using a simple one-pot hydrothermal process, which provides the smooth diffusion pathways for timely transport of electrons and reactants for ORR electrocatalysis .…”

Microwave-assisted pyrolysis of Pachira aquatica leaves as a catalyst for the oxygen reduction reaction

“…With the effects of the nanostructure, heteroatoms doping, and surface property, the non-precious metal catalysts showed remarkable ORR activity. [27][28][29][30][31] However, there are lots of preparation methods involved in toxic solvents. Waste biomass contains a high amount of carbon, oxygen and nitrogen elements, and it can be used as an inexpensive precursor of carbon to lower down the environmental impact of the procedure.…”