Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage
(2023) In ACS Nano- Abstract
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... (More)
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.
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- author
- Sikdar, Anirban ; Héraly, Frédéric ; Zhang, Hao ; Hall, Stephen LU ; Pang, Kanglei ; Zhang, Miao and Yuan, Jiayin
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- in press
- subject
- keywords
- 2D materials, freestanding hydrogel, holey-MXene, pseudocapacitor, self-assembly
- in
- ACS Nano
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:38230678
- scopus:85183528105
- ISSN
- 1936-0851
- DOI
- 10.1021/acsnano.3c11551
- language
- English
- LU publication?
- yes
- id
- 7dffa2b5-0026-4948-8ee1-ac224e09cc6d
- date added to LUP
- 2024-02-15 15:33:30
- date last changed
- 2024-04-16 14:35:53
@article{7dffa2b5-0026-4948-8ee1-ac224e09cc6d,
abstract = {{<p>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 (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) hydrogels with hierarchically porous structures. The tetraamminezinc(II) complex cation ([Zn(NH<sub>3</sub>)<sub>4</sub>]<sup>2+</sup>) 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<sup>-1</sup> at 10 mV s<sup>-1</sup> and superb capacitance retention of 79% at 5000 mV s<sup>-1</sup>, 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<sup>-2</sup>, it maintains an impressive capacitance retention of 52% at 1000 mV s<sup>-1</sup>. 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.</p>}},
author = {{Sikdar, Anirban and Héraly, Frédéric and Zhang, Hao and Hall, Stephen and Pang, Kanglei and Zhang, Miao and Yuan, Jiayin}},
issn = {{1936-0851}},
keywords = {{2D materials; freestanding hydrogel; holey-MXene; pseudocapacitor; self-assembly}},
language = {{eng}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Nano}},
title = {{Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage}},
url = {{http://dx.doi.org/10.1021/acsnano.3c11551}},
doi = {{10.1021/acsnano.3c11551}},
year = {{2023}},
}