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Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-2133-888X
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3334-9076
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2024 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 18, no 4, p. 3707-3719Article in journal (Refereed) Published
Abstract [en]

The true promise of MXene as a practical supercapacitor electrode hinges on the simultaneous advancement of its three-dimensional (3D) assembly and the engineering of its nanoscopic architecture, two critical factors for facilitating mass transport and enhancing an electrode’s charge-storage performance. Herein, we present a straightforward strategy to engineer robust 3D freestanding MXene (Ti3C2Tx) hydrogels with hierarchically porous structures. The tetraamminezinc(II) complex cation ([Zn(NH3)4]2+) is selected to electrostatically assemble colloidal MXene nanosheets into a 3D interconnected hydrogel framework, followed by a mild oxidative acid-etching process to create nanoholes on the MXene surface. These hierarchically porous, conductive holey-MXene frameworks facilitate 3D transport of both electrons and electrolyte ions to deliver an excellent specific capacitance of 359.2 F g–1 at 10 mV s–1 and superb capacitance retention of 79% at 5000 mV s–1, representing a 42.2% and 15.3% improvement over pristine MXene hydrogel, respectively. Even at a commercial-standard mass loading of 10.1 mg cm–2, it maintains an impressive capacitance retention of 52% at 1000 mV s–1. This rational design of an electrode by engineering nanoholes on MXene nanosheets within a 3D porous framework dictates a significant step forward toward the practical use of MXene and other 2D materials in electrochemical energy storage systems. 

Place, publisher, year, edition, pages
2024. Vol. 18, no 4, p. 3707-3719
Keywords [en]
self-assembly, 2D materials, holey-MXene, freestanding hydrogel, pseudocapacitor
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-225685DOI: 10.1021/acsnano.3c11551ISI: 001154866800001PubMedID: 38230678Scopus ID: 2-s2.0-85183528105OAI: oai:DiVA.org:su-225685DiVA, id: diva2:1829680
Funder
Swedish Research Council, 2021-05839Swedish Research Council, 201805351Knut and Alice Wallenberg Foundation, KAW 2017.0166Available from: 2024-01-19 Created: 2024-01-19 Last updated: 2024-02-19Bibliographically approved

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Sikdar, AnirbanHéraly, FrédéricPang, KangleiZhang, MiaoYuan, Jiayin

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Sikdar, AnirbanHéraly, FrédéricPang, KangleiZhang, MiaoYuan, Jiayin
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