Coordination compound-derived ordered mesoporous N-free Fe–P_x–C material for efficient oxygen electroreduction

Abstract

N-free Fe–P–C electrocatalysts for oxygen electroreduction, with competitive activity to Fe–N–C materials, were obtained by the using (Ph3P)2Fe(CO)3-nanocasting techniques.

Recent Advances in Phosphorus‐Coordinated Transition Metal Single‐Atom Catalysts for Oxygen Reduction Reaction

“…The strong oxidizing acid and P 2 O 5 would cause carbon gasification and deformation of the graphite structure, resulting in pores and wrinkles, [11,44] which increase the surface area of catalyst and, on the other hand, decrease the electrical conductivity of the carbon substrate. In addition, the P−O bonds in phosphoric acid and PA tend to be retained after pyrolysis due to the strong P−O binding [10,20–21] …”

“…In the past few years, theoretical and experimental studies have been carried out on the phosphorus coordination active sites, including phosphorus‐coordinated metal (M−P x ) [10–12,19–22] and nitrogen‐phosphorus dual‐coordinated metal (M−N x P y ) [15,23–26] . These catalysts have shown superiority in activity in comparison with N‐coordinated ones.…”

Constrained-volume assembly of organometal confined in polymer to fabricate multi-heteroatom doped carbon for oxygen reduction reaction

“…It is worth noting that FNP-5 shows the lowest H 2 O 2 yield and a nearly 4 electron process either in alkaline or acidic medium, indicating it possesses a similar ORR kinetics to commercial Pt/C. On the other hand, the series of FNP catalysts reported herein demonstrate excellent catalytic performance compared to the reported Fe-P-C, Fe-N-C and P-N-C catalysts [50][51][52]. The outstanding performance is mainly attributed to the unique composition and structure of the nanocomposites through constrained-volume self-assembly.…”

“…The outstanding performance is mainly attributed to the unique composition and structure of the nanocomposites through constrained-volume self-assembly. Firstly, the organometal and polymer precursors contain a diversity of active elements, leading to a variety of energetic centers such as Fe-C, Fe-P, Fe-N, N-P and N-C for electrochemical process [47,50,51]. At the same time, the polymer coating leads to the uniform distribution of Fe-based NPs within the carbon matrix and a strong interaction between them.…”

Iron Phosphide Incorporated into Iron‐Treated Heteroatoms‐Doped Porous Bio‐Carbon as Efficient Electrocatalyst for the Oxygen Reduction Reaction

“…Among them, Fe‐treated N‐doped‐carbons (Fe−N−C) are accepted as the most promising electrocatalysts for ORR, which show high ORR catalytic performance even with very small amount of Fe content . On the other hand, recently, there have been several reports for Fe−P species embedded in carbon structure, with or without other heteroatom doping, which exhibit high catalytic performance for ORR in alkaline medium . In addition, Fe−P−C electrocatalyst, which was prepared by mixing phytic acid and FeCl 3 , followed by polymerization at 900 °C showed high ORR catalytic performance with four electrons pathway in both alkaline and acidic media …”