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      Metal–organic framework-derived one-dimensional porous or hollow carbon-based nanofibers for energy storage and conversion

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          Abstract

          This review summarizes the advances in the derivation of one-dimensional porous and hollow carbon nanofibers from metal–organic frameworks for energy storage and conversion.

          Abstract

          Metal organic framework (MOF)-derived nanoporous carbons (NPCs) have been proposed as promising electrode materials for energy storage and conversion devices. However, MOF-derived NPCs typically suffer from poor electrical conductivity due to the lack of connectivity between these particles and a micropore-dominated storage mechanism, which hinder mass and electron transfer, thereby leading to poor electrochemical performance. In recent years, one-dimensional (1D) MOF-derived carbon nanostructures obtained using an electrospinning method have emerged as promising materials for both electrochemical energy storage (EES) and energy conversion applications. In this mini review, the recent progress in the development of MOF-derived 1D porous or hollow carbon nanofibers using the electrospinning method and their application in energy storage ( e.g., supercapacitors and rechargeable batteries) and conversion devices ( e.g., fuel cells) is presented. The synthetic method, formation mechanism and the structure–activity relationship of such porous or hollow carbon nanofibers are also discussed in detail. Finally, future perspectives on the development of electrospun MOF-derived carbon nanomaterials for energy storage and conversion applications are provided. This review will provide some guidance for future derivations of 1D hollow carbon nanomaterials from MOFs using electrospinning technology.

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          Electrochemical capacitors: mechanism, materials, systems, characterization and applications.

          Electrochemical capacitors (i.e. supercapacitors) include electrochemical double-layer capacitors that depend on the charge storage of ion adsorption and pseudo-capacitors that are based on charge storage involving fast surface redox reactions. The energy storage capacities of supercapacitors are several orders of magnitude higher than those of conventional dielectric capacitors, but are much lower than those of secondary batteries. They typically have high power density, long cyclic stability and high safety, and thus can be considered as an alternative or complement to rechargeable batteries in applications that require high power delivery or fast energy harvesting. This article reviews the latest progress in supercapacitors in charge storage mechanisms, electrode materials, electrolyte materials, systems, characterization methods, and applications. In particular, the newly developed charge storage mechanism for intercalative pseudocapacitive behaviour, which bridges the gap between battery behaviour and conventional pseudocapacitive behaviour, is also clarified for comparison. Finally, the prospects and challenges associated with supercapacitors in practical applications are also discussed.
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            Pd-Pt bimetallic nanodendrites with high activity for oxygen reduction.

            Controlling the morphology of Pt nanostructures can provide a great opportunity to improve their catalytic properties and increase their activity on a mass basis. We synthesized Pd-Pt bimetallic nanodendrites consisting of a dense array of Pt branches on a Pd core by reducing K2PtCl4 with L-ascorbic acid in the presence of uniform Pd nanocrystal seeds in an aqueous solution. The Pt branches supported on faceted Pd nanocrystals exhibited relatively large surface areas and particularly active facets toward the oxygen reduction reaction (ORR), the rate-determining step in a proton-exchange membrane fuel cell. The Pd-Pt nanodendrites were two and a half times more active on the basis of equivalent Pt mass for the ORR than the state-of-the-art Pt/C catalyst and five times more active than the first-generation supportless Pt-black catalyst.
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              Metal-organic framework as a template for porous carbon synthesis.

              Porous carbon was synthesized by heating the precursor FA within the pores of MOF-5. The resultant carbon displayed a high specific surface area (BET, 2872 m2.g-1) and important hydrogen uptake (2.6 wt % at 760 Torr, -196 degrees C) as well as excellent electrochemical properties as an electrode material for electrochemical double-layered capacitor (EDLC).
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                Author and article information

                Journal
                MHAOAL
                Materials Horizons
                Mater. Horiz.
                Royal Society of Chemistry (RSC)
                2051-6347
                2051-6355
                2018
                2018
                : 5
                : 3
                : 394-407
                Affiliations
                [1 ]Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
                [2 ]School of Environmental and Biological Engineering
                [3 ]Nanjing University of Science and Technology
                [4 ]Nanjing 210094
                [5 ]People's Republic of China
                [6 ]College of Chemistry and Molecular Engineering
                [7 ]Qingdao University of Science and Technology
                [8 ]Qingdao 266042
                [9 ]China
                [10 ]World Premier International Center for Materials Nanoarchitectonics (WPI-MANA)
                [11 ]National Institute for Materials Science (NIMS)
                [12 ]Ibaraki 305-0044
                [13 ]Japan
                [14 ]Australian Institute for Innovative Materials (AIIM)
                [15 ]School of Chemical Engineering & Australian Institute for Bioengineering and Nanotechnology (AIBN)
                [16 ]The University of Queensland
                [17 ]Brisbane
                [18 ]Australia
                [19 ]Department of Plant & Environmental New Resources
                Article
                10.1039/C8MH00133B
                65db48b2-f5e4-46cb-8557-1e4b46772e3e
                © 2018

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