| 1. |
- Kehoe, Laura, et al.
(författare)
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Make EU trade with Brazil sustainable
- 2019
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 364:6438, s. 341-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Jayaramulu, K., et al.
(författare)
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Covalent Graphene-MOF Hybrids for High-Performance Asymmetric Supercapacitors
- 2021
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Ingår i: Advanced Materials. - : Wiley-VCH Verlag. - 0935-9648 .- 1521-4095. ; 33:4
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Tidskriftsartikel (refereegranskat)abstract
- In this work, the covalent attachment of an amine functionalized metal-organic framework (UiO-66-NH2 = Zr6O4(OH)4(bdc-NH2)6; bdc-NH2 = 2-amino-1,4-benzenedicarboxylate) (UiO-Universitetet i Oslo) to the basal-plane of carboxylate functionalized graphene (graphene acid = GA) via amide bonds is reported. The resultant GA@UiO-66-NH2 hybrid displayed a large specific surface area, hierarchical pores and an interconnected conductive network. The electrochemical characterizations demonstrated that the hybrid GA@UiO-66-NH2 acts as an effective charge storing material with a capacitance of up to 651 F g−1, significantly higher than traditional graphene-based materials. The results suggest that the amide linkage plays a key role in the formation of a π-conjugated structure, which facilitates charge transfer and consequently offers good capacitance and cycling stability. Furthermore, to realize the practical feasibility, an asymmetric supercapacitor using a GA@UiO-66-NH2 positive electrode with Ti3C2TX MXene as the opposing electrode has been constructed. The cell is able to deliver a power density of up to 16 kW kg−1 and an energy density of up to 73 Wh kg−1, which are comparable to several commercial devices such as Pb-acid and Ni/MH batteries. Under an intermediate level of loading, the device retained 88% of its initial capacitance after 10 000 cycles. © 2020 The Authors. Advanced Materials published by Wiley-VCH GmbH
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| 3. |
- Horn, M. R., et al.
(författare)
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Polyoxometalates (POMs) : From electroactive clusters to energy materials
- 2021
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Ingår i: Energy & Environmental Science. - : Royal Society of Chemistry. - 1754-5692 .- 1754-5706. ; 14:4, s. 1652-1700
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Tidskriftsartikel (refereegranskat)abstract
- Polyoxometalates (POMs) represent a class of nanomaterials, which hold enormous promise for a range of energy-related applications. Their promise is owing to their "special"structure that gives POMs a truly unique ability to control redox reactions in energy conversion and storage. One such amazing capability is their large number of redox active sites that arises from the complex three-dimensional cluster of metal-oxide ions linked together by oxygen atoms. Here, a critical review on how POMs emerged from being molecular clusters for fundamental studies, to next-generation materials for energy applications is provided. We highlight how exploiting the versatility and activity of these molecules can lead to improved performance in energy devices such as supercapacitors and batteries, and in energy catalyst applications. The potential of POMs across numerous fields is systematically outlined by investigating structure-property-performance relationships and the determinant factors for energy systems. Finally, the challenges and opportunities for this class of materials with respect to addressing our pressing energy-related concerns are identified. This journal is © The Royal Society of Chemistry.
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| 4. |
- Jadhav, S., et al.
(författare)
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Enhancing Mechanical Energy Transfer of Piezoelectric Supercapacitors
- 2021
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Ingår i: Advanced Materials Technologies. - : John Wiley and Sons Inc. - 2365-709X.
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Tidskriftsartikel (refereegranskat)abstract
- The expected widespread use of wearable and other low-power healthcare devices has triggered great interest in piezoelectric materials as a promising energy harvester. However, traditional piezoelectric materials suffer from poor interfacial energy transfer when used in self-charging power cells. Herein, piezoelectric supercapacitors (PSCs) are engineered using MXene-incorporated polymeric piezo separator and MXene (Ti3C2Tx) multilayered sheets as electrodes. The MXene-blended polymer film showed considerable improvement with maximum output voltage of 28 V and current of 1.71 µA. The electromechanical properties studied by piezoelectric force microscopy suggest that the integration of MXene in polyvinylidene fluoride (PVDF) matrix induces the degree of dipole moment alignment, thereby improving the piezoelectric properties of PVDF. At the device level, the PSC featured the capacitance of 61 mF cm–2, the energy density of 24.9 mJ cm−2, the maximum power density of 1.3 mW cm−3, and the excellent long-term cycling stability. A way is paved toward green, integrated energy harvesting and storing technology for next-generation self-powered implantable and wearable electronics. © 2021 Wiley-VCH GmbH
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| 5. |
- Pham, H. D., et al.
(författare)
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Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor
- 2021
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Ingår i: Electrochimica Acta. - : Elsevier Ltd. - 0013-4686 .- 1873-3859. ; 389
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Tidskriftsartikel (refereegranskat)abstract
- Potassium-ion capacitor (KICs) is an emerging technology that can potentially combines the virtue of high power capability of supercapacitors and high energy density of batteries. Herein, we have scientifically transformed blue denim textile waste into two different forms of nanocarbons to assemble dual carbon potassium-ion hybrid capacitor (KIHC). The unique composition of indigo and sulphur dyes in blue jeans enables to produce multi-heteroatom (nitrogen, sulphur and oxygen) doped hard carbon (MHC) with large interlayer spacing (0.41 nm) in a single step. An in-situ transmission electron microscopy (TEM) analysis reveal that the charge stored in disordered and large interlayer spaced graphitic structure enable fast kinetics for efficient potassium-ion transportation. Coupling with an activated carbon foam (ACF)-based cathode, a full cell of potassium-ion capacitor successfully delivers a high energy density of 181 Wh kg−1 at 70.4 W kg−1 and 61.8 Wh kg−1 at 4000 W kg−1, as well as an long lifespan of 5000 cycles with over 89% of capacity retention. These performance statistics match or exceed state-of-the-art values for KIHCs, providing novel strategy to develop dual carbon ion capacitors with high energy and high power capabilities. © 2021
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