FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Abstract

The development of cost‐effective and durable oxygen electrocatalysts remains highly critical but challenging for energy conversion and storage devices. Herein, a novel FeNi alloy nanoparticle core encapsulated in carbon shells supported on a N‐enriched graphene‐like carbon matrix (denoted as FeNi@C/NG) was constructed by facile pyrolyzing the mixture of metal salts, glucose, and dicyandiamide. The in situ pyrolysis of dicyandiamide in the presence of glucose plays a significant effect on the fabrication of the porous FeNi@C/NG with a high content of doped N and large specific surface area. The optimized FeNi@C/NG catalyst displays not only a superior catalytic performance for the oxygen reduction reaction (ORR, with an onset potential of 1.0 V and half‐wave potential of 0.84 V) and oxygen evolution reaction (OER, the potential at 10 mA cm−2 is 1.66 V) simultaneously in alkaline, but also outstanding long‐term cycling durability. The excellent bifunctional ORR/OER electrocatalytic performance is ascribed to the synergism of the carbon shell and FeNi alloy core together with the high‐content of nitrogen doped on the large specific surface area graphene‐like carbon.

Fe−Ni Nanoparticles on N‐doped Carbon as Catalysts for Electrocatalytic Reduction of CO2 to Tune CO/H2 Ratio

“…The XPS spectra of Fe 2P (Figure 3a) can be divided into four characteristic peaks: Fe 0 2p 3/2 (710.3 eV), Fe 3 + 2p 3/2 (712.9 eV), Fe 0 2P 1/2 (722.9 eV), and Fe 3 + 2p 1/2 (725.4 eV) . [27,34] A binding energy of 710.3 eV can also be associated with the coordination of Fe with N, which is consistent with the metal-N composition in N 1s. The charge transfer from Fe to the Ndoped C structure leads to an enhancement of the charge density in the C layer, which improves the CO 2 RR performance .…”

“…The Fe 2 Ni/NG synthesis process [27] is shown in Figure 1a. Typically, 0.261-g FeCl 3 • 6H 2 O (0.08 mmol), 0.095-g NiCl 2 • 6H 2 O (0.04 mmol), 15-g dicyandiamine, and 1-g glucose are dissolved into 200 mL ultrapure water and magnetically stirred at 80 °C for 3 h. The obtained suspension is placed in an oven at 80 °C and dried for 1 d. The dry solid mixture is heated to 800 °C at 2 °C/min under an Ar gas stream and held for 120 min to obtain the Fe 2 Ni/NG catalyst.…”

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites†

“…However, the ORR activitied of the most reported M@NG, especially with non‐precious metal core, are still far away from that of the commercial Pt/C. [ 71‐72 ] The noble metals with the unique 4d electronic track arrangement often display excellent performance for OER and ORR, but the high price still hinders their large‐scale commercialization. Therefore, decrease the usage of precious metals in catalysts by incorporating non‐precious metals to generate alloys could be an effective solution.…”

Metal–Organic Frameworks (MOFs) Derived Materials Used in Zn–Air Battery

“…Currently, most of the MOF-derived Fe-containing bimetallic catalysts focused on FeCo bifunctional electrocatalyst. Other Fe-containing bimetallic ORR/OER catalysts are mainly supported by carbon materials such as graphene, carbon nanotubes, and g-C 3 N 4 , such as FeMn-based bifunctional electrocatalyst [ 111 , 112 , 113 ], FeNi-based bifunctional electrocatalyst [ 114 , 115 , 116 , 117 , 118 ], and FeCu-based bifunctional electrocatalyst [ 119 ]. There are few reports on other Fe-containing bimetallic catalysts derived from MOF for ORR/OER.…”