Iron MOF-Derived Fe₂O₃/NPC Decorated on MIL-88A Converted Fe₃C Implanted Electrospun Porous Carbon Nanofibers for Symmetric Supercapacitors

Abstract

Moderated thermal transformation of metal–organic frameworks (MOFs) empowers the synthesis of nanomaterials with precisely controlled porosities and morphologies, leading to enhanced performance in energy storage applications. Herein, we prepared MIL-88A-derived Fe3C-integrated EPCNFs (EPCNFs = electrospun porous carbon nanofibers) mats for the outside growth of Fe-MOFs using a moderated temperature calcination technique. The applied technique endorsed the conversion of the Fe-MOFs into Fe2O3/NPC (NPC = nanoporous carbon) without any destruction in the morphology of the nanorods. The integrated MIL-88A-derived Fe3C reduces the intrinsic resistance and synergizes with the overall performance of the resulting negative electrode (Fe2O3/NPC@Fe3C/EPCNFs). The resulting MOF-derived electrode materials have excellent performance within the −1 to 0 window potential range. The optimized electrode Fe2O3/NPC-350@Fe3C/EPCNFs exhibits a high specific capacitance (531 F g–1 at 1 A g–1) and stable cycling performance, retaining more than 90% even after 20000 cycles. The uniform, vertical, porous, and highly interconnected tetragonal rod-like nanomaterials can also maintain structural integrity during continuous charge/discharge. In addition, the assembled symmetric supercapacitor (Fe2O3/​NPC-350@Fe3C/​EPCNFs//Fe2O3/​NPC-350@Fe3C/EPCNFs) exhibits an energy density of 21.6 W h kg–1 at a power density of 499.05 W kg–1 with superior cycling stability (20000 cycles at 20 A g–1), indicating the feasibility of the prepared electrode for practical application in energy storage systems.

Electrospun PbS/PAN–PANI Carbon Nanofibers Decorated on Carbon Cloth as Pseudo-Electrochemical Capacitor Material

“…Notably, an escalation in scan rate correlates with an augmentation in current intensity while maintaining the quasi-rectangular shape, thus underscoring the pseudocapacitive behavior of the material . The increase in specific capacitance observed at lower scan rates can be attributed to the increased electroactive area that is available for electrochemical reactions at such rates . Conversely, higher scan rates limit capacitance, as only the external surface area is available for electrochemical reactions …”

“…46 The increase in specific capacitance observed at lower scan rates can be attributed to the increased electroactive area that is available for electrochemical reactions at such rates. 47 Conversely, higher scan rates limit capacitance, as only the external surface area is available for electrochemical reactions. 47 Figure 6b showcases the CV curves of PbS CNFs in the 1 M H 2 SO 4 electrolyte , respectively.…”

“…47 Conversely, higher scan rates limit capacitance, as only the external surface area is available for electrochemical reactions. 47 Figure 6b showcases the CV curves of PbS CNFs in the 1 M H 2 SO 4 electrolyte , respectively. Notably, the integral area of the CV curves exhibits a consistent augmentation.…”

(Fe-Co-Ni-Zn)-Based Metal–Organic Framework-Derived Electrocatalyst for Zinc–Air Batteries

“…They possess a porous structure with a large internal surface area, making them suitable for diverse applications. MOFs are synthesized through self-assembly, where metal ions or clusters bind with organic ligands to create extensive networks [27,28]. More than 20,000 MOF materials have reportedly been synthesized thus far, according to reports [29,30].…”

Structural Control of Nanofibers According to Electrospinning Process Conditions and Their Applications

“…Therefore, electrical double-layer capacitance and flexibility were effectively achieved at an intermediate range of 70% RH, showing 249 F•g −1 capacitance value and 97.3% cycling stability. In an effort to further improve the supercapacitor performance, Acharya et al are attracted by the moderated thermal transformation ability of metal−organic frameworks (MOFs), which empowers the synthesis of nanomaterials with precisely controlled porosities and morphologies (Figure 19c) [186]. Here, iron MOF and MIL-88A were used as the source of Fe 2 O 3 /nanoporous carbon (NPC) and Fe 3 C, respectively.…”