Dual-electroactive metal–organic framework nanosheets as negative electrode materials for supercapacitors

Ding, Zhaozhao; Cheng, Zhen; Shi, Nai; Guo, Zhixiang; Ren, Yubao; Han, Min; Chen, Mingyu; Xie, Linghai; Huang, Wei

doi:10.1016/j.cej.2022.137193

Cited by 22 publications

(9 citation statements)

References 60 publications

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“…However, the gel-to-sol transition of electrolytes always takes a long time as the dissolution process of PNIPAm is determined by polymeric chain movements in highly viscous solutions. , Meanwhile, the sol-state electrolytes are still trapped by potential issues with the liquid electrolytes, likely leakage, and are not suitable for developing flexible devices. Thus, PNIPAm-based electrolytes with LCST-induced gel–gel transitions rather than sol–gel transitions are proposed to fabricate the flexible self-protective supercapacitor, meeting needs of a lightweight and portable design of flexible electronic devices. − These flexible electronics could be also applied in various fields not limited to energy devices, such as wearable/implantable health monitoring systems and human–machine interactions. , …”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Tan

Zhang

Xue

et al. 2023

Ind. Eng. Chem. Res.

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Thermoresponsive sol−gel transitions of poly(Nisopropylacrylamide) (PNIPAm) aqueous electrolytes have been explored to endow smart overheating self-protection for energy devices, but sol-state electrolytes are not suitable for flexible or wearable energy devices. It has remained challenging to explore PNIPAm hydrogels as smart electrolytes and separators in flexible energy devices. Herein, PNIPAm hydrogels cross-linked by ionic liquids were designed and prepared with gel−gel transitions for flexible supercapacitors, working both as the smart electrolyte and separator. The assembled supercapacitors exhibited desired specific capacitance and long-term stability at room temperature, and the capacitance suddenly dropped to almost zero at 60 °C to switch to self-protection of the supercapacitors. The reversible overheating protections were both obtained in both unbending and bending supercapacitors. The ionic liquid cross-linker played an important role to achieve effective overheating protections by confining more ions in the aggregated PNIPAm phase at high temperatures. Consequently, the ionic liquid cross-linked PNIPAm hydrogel electrolytes here demonstrated the advanced shutdown function of electrochemical performance compared with conventional thermoresponsive electrolytes. This work will inspire a more rational design of thermoresponsive hydrogel electrolytes in the perspective of polymers and aqueous electrolytes to achieve overheating protections.

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Section: Introductionmentioning

confidence: 99%

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Tan

Zhang

Xue

et al. 2023

Ind. Eng. Chem. Res.

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“…High-resolution XPS spectrum, CV curves, Nyquist plots, specific capacitance versus current density plot of ASC, powder XRD patterns, comparative CV curves and GCD curves, XRD pattern and FE-SEM image, CV curves of CB electrode at different scan rates (5,10,25,50, and 100 mV s −1 ), GCD curves of CB electrode at different current densities (5, 10, 15, 20,…”

Section: * Sı Supporting Informationmentioning

confidence: 99%

“…Further, an ASC device was fabricated using electrodeposited MnO 2 as the positive electrode, and EV-HNSs as the negative electrode. The ASC exhibited a high areal energy density of 9.4 μW h cm –2 at 775 μW cm –2 in an operating potential of 1.55 V. 25 Chen, Xu, and Jiao et al synthesized a porous NiO-incorporated Ni-MOF/NF with a cylindrical cage-like structure to promote the transport of electrons and ions in the electrochemical energy storage process. The prepared NiO@Ni-MOF/NF delivered a high specific capacity of 1853 C cm –2 at 1 mA cm –2 .…”

Section: Introductionmentioning

confidence: 99%

Incorporation of α-MnO₂ Nanoflowers into Zinc-Terephthalate Metal–Organic Frameworks for High-Performance Asymmetric Supercapacitors

et al. 2023

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Herein, we report the synthesis of α-MnO 2 nanoflower-incorporated zinc-terephthalate MOFs (MnO 2 @Zn-MOFs) via the conventional solution phase synthesis technique as an electrode material for supercapacitor applications. The material was characterized by powder-X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy techniques. The prepared electrode material exhibited a specific capacitance of 880.58 F g −1 at 5 A g −1 , which is higher than the pure Zn-BDC (610.83 F g −1 ) and pure α-MnO 2 (541.69 F g −1 ). Also, it showed a 94% capacitance retention of its initial value after 10,000 cycles at 10 A g −1 . The improved performance is attributed to the increased number of reactive sites and improved redox activity due to MnO 2 inclusion. Moreover, an asymmetric supercapacitor assembled using MnO 2 @Zn-MOF as the anode and carbon black as the cathode delivered a specific capacitance of 160 F g −1 at 3 A g −1 with a high energy density of 40.68 W h kg −1 at a power density of 20.24 kW kg −1 with an operating potential of 0−1.35 V. The ASC also exhibited a good cycle stability of 90% of its initial capacitance.

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“…These materials offer advantages such as a large surface area, tunable porosity, and controllable structures. 32,36,37 MOF-based composites find applications in diverse fields including energy storage and conversion devices, gas separation, sensing, and water purification. 38−42 Among various MOF-based conductive carbonaceous materials, we prepared Fe-MOF-derived Fe 3 Cintegrated electrospun porous carbon nanofibers (EPCNFs) mats.…”

Section: Introductionmentioning

confidence: 99%

“…MOFs are emerging crystalline porous nanomaterials, composed of metal ions and organic linkers. , Undistorted structures of MOF-derived materials have gained significant attention in recent years due to their potential for constructing functional materials. These materials offer advantages such as a large surface area, tunable porosity, and controllable structures. ,, MOF-based composites find applications in diverse fields including energy storage and conversion devices, gas separation, sensing, and water purification. − Among various MOF-based conductive carbonaceous materials, we prepared Fe-MOF-derived Fe 3 C-integrated electrospun porous carbon nanofibers (EPCNFs) mats. More importantly, as a negative electrode material, the Fe-MOF-derived porous carbon inside and outside of the EPCNFs effectively enhanced the charge storage.…”

Section: Introductionmentioning

confidence: 99%

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

Acharya

Muthurasu

et al. 2023

ACS Appl. Energy Mater.

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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.

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Dual-electroactive metal–organic framework nanosheets as negative electrode materials for supercapacitors

Cited by 22 publications

References 60 publications

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Incorporation of α-MnO₂ Nanoflowers into Zinc-Terephthalate Metal–Organic Frameworks for High-Performance Asymmetric Supercapacitors

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

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Dual-electroactive metal–organic framework nanosheets as negative electrode materials for supercapacitors

Cited by 22 publications

References 60 publications

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Ionic Liquid Cross-linked Poly(N-isopropylacrylamide) Hydrogel Electrolytes for Self-Protective Flexible Separator-Free Supercapacitors

Incorporation of α-MnO2 Nanoflowers into Zinc-Terephthalate Metal–Organic Frameworks for High-Performance Asymmetric Supercapacitors

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

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Product

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Incorporation of α-MnO₂ Nanoflowers into Zinc-Terephthalate Metal–Organic Frameworks for High-Performance Asymmetric Supercapacitors

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