MOF‐Templated Assembly Approach for Fe₃C Nanoparticles Encapsulated in Bamboo‐Like N‐Doped CNTs: Highly Efficient Oxygen Reduction under Acidic and Basic Conditions

Abstract

Developing high-performance non-precious metal catalysts (NPMCs) for the oxygen-reduction reaction (ORR) is of critical importance for sustainable energy conversion. We reportan ovel NPMC consistingo fi ron carbide (Fe 3 C) nanoparticles encapsulatedi nN -doped bamboo-like carbon nanotubes (b-NCNTs), synthesized by an ew metal-organic framework (MOF)-templated assembly approach. Thee lectrocatalyst exhibits excellent ORR activity in 0.1 m KOH (0.89 Va tÀ1mAcm

Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

“…This conclusion is supported by previous studies where spinel Co–Mn oxide nanoparticles partially embedded in MWCNTs exhibited exceptional stability as bifunctional ORR/OER catalysts, which was attributed to encapsulation of the metal oxide particles inside the MWCNTs . In related studies, durable electrocatalysis for O 2 reduction has been achieved by Fe nanoparticles embedded inside MWCNTs . The graphitic walls of the MWCNTs thus prevent rapid dissolution of the embedded particles by preventing their direct contact with the electrolyte.…”

Rational Microstructure Design on Metal–Organic Framework Composites for Better Electrochemical Performances: Design Principle, Synthetic Strategy, and Promotion Mechanism

“…The polymerization of polypyrrole inside the pores and outside of Zif‐8 are conducted by Schuhmann and co‐workers to introduce Fe 3+ inside the polypyrrole/Zif‐8 composites due to the coordination of pyrrole nitrogen atom to Fe 3+ , finally reaching a high‐performance ORR catalyst with Fe 3 C nanoparticles encapsulated in bamboo‐like N‐doped carbon nanotube . Recently, Xiang and co‐workers engineered a facile and low‐cost HER catalyst with Fe x P nanoparticle anchored inside a hollow C–P‐codoped carbon, which was derived form a glyphosine‐modified MIL‐101‐NH 2 ‐Fe, in which glyphosine acted as P sources for both P doping of carbon and formation of Fe x P. The Fe x P/NPC catalyst can produce hydrogen in long time run with a Faradaic efficiency of near 100%, and the voltage showed only less 0.3% increase at 10 mA cm −2 after 90 h …”

Transition Metal Carbide Complex Architectures for Energy‐Related Applications

“…The typical strategies for controlled synthesis of TMC nanotubes have been mainly focused on in situ growth and templating . There are several examples of the strategy of in situ growth of the TMC (including their composites) nanotubes . Typically, the Guo group has synthesized bamboo‐like carbon nano‐tube/Fe 3 C nano‐particle hybrids by using the in situ growth method with melamine, P123, and Fe(NO 3 ) 3 as reactants .…”

“…The structural and compositional characterizations of the bamboo‐like carbon nano‐tube/Fe 3 C hybrid afford the advantages such as high percentage of pyridinic N, more active sites, and host–guest electronic interaction between the Fe and the carbon, all of which endow the hybrid excellent electrocatalytic performances, such as much higher ORR activity (Figure c), better stability, and better methanol tolerance. Moreover, a new synthesis strategy of MOF‐template‐assembly for the synthesis of bamboo‐like Fe 3 C/N‐doped carbon nanotubes was also developed to achieve high ORR performance by their unique structural and compositional advantages . The mixture of KIT‐6 with P123 inside the pores and CoPc (Pc=phthalocyanine) were used to prepare Co x C/carbon nanotubes by the in situ growth method .…”