In-situ pillared MXene as a viable zinc-ion hybrid capacitor
In-situ pillared MXene as a viable zinc-ion hybrid capacitor
MXenes are recently discovered two-dimensional materials which have shown great promise in electrochemical energy storage. However, the majority of research has been on lithium and sodium systems, with little work done on multivalent ion systems, which have an urgent need for new electrode materials. In particular, zinc-ion aqueous systems have significant promise due to the widespread use of zinc batteries and the abundance (24th most abundant element on Earth), high specific capacity (>800 mAh g−1) and low toxicity of zinc. Only a few materials are reported to act as reversible zinc-ion hosts, hindering developments of this technology. In this work, we demonstrate for the first time that Ti3C2, the most studied MXene to date, can act as a reversible zinc-ion host for a hybrid capacitor using an aqueous zinc sulphate electrolyte. In addition, we report a novel in-situ pillaring method where CTAB is used to increase the Zn-ion uptake, with capacities up to 189 mAh g−1. A detailed mechanistic study that encompasses diffraction, microscopy and spectroscopy techniques was conducted to shed light on the structure and kinetics of the system. This understanding was used to optimise the electrode performance, resulting in outstanding cycling stability of over 96% over 1000 cycles. We believe this study will pave the pathway towards designing new pillared MXenes in low-cost Zn-ion aqueous systems.
Energy storage, MXenes, Zn-ion capacitors
Maughan, Philip A.
3bdf4190-8639-40b1-a522-3ab0ca0cfc0c
Tapia-Ruiz, Nuria
3983b001-dcd1-4780-8a5b-ec8e27b78e9b
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
1 May 2020
Maughan, Philip A.
3bdf4190-8639-40b1-a522-3ab0ca0cfc0c
Tapia-Ruiz, Nuria
3983b001-dcd1-4780-8a5b-ec8e27b78e9b
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
Maughan, Philip A., Tapia-Ruiz, Nuria and Bimbo, Nuno
(2020)
In-situ pillared MXene as a viable zinc-ion hybrid capacitor.
Electrochimica Acta, 341, [136061].
(doi:10.1016/j.electacta.2020.136061).
Abstract
MXenes are recently discovered two-dimensional materials which have shown great promise in electrochemical energy storage. However, the majority of research has been on lithium and sodium systems, with little work done on multivalent ion systems, which have an urgent need for new electrode materials. In particular, zinc-ion aqueous systems have significant promise due to the widespread use of zinc batteries and the abundance (24th most abundant element on Earth), high specific capacity (>800 mAh g−1) and low toxicity of zinc. Only a few materials are reported to act as reversible zinc-ion hosts, hindering developments of this technology. In this work, we demonstrate for the first time that Ti3C2, the most studied MXene to date, can act as a reversible zinc-ion host for a hybrid capacitor using an aqueous zinc sulphate electrolyte. In addition, we report a novel in-situ pillaring method where CTAB is used to increase the Zn-ion uptake, with capacities up to 189 mAh g−1. A detailed mechanistic study that encompasses diffraction, microscopy and spectroscopy techniques was conducted to shed light on the structure and kinetics of the system. This understanding was used to optimise the electrode performance, resulting in outstanding cycling stability of over 96% over 1000 cycles. We believe this study will pave the pathway towards designing new pillared MXenes in low-cost Zn-ion aqueous systems.
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More information
Accepted/In Press date: 11 March 2020
e-pub ahead of print date: 12 March 2020
Published date: 1 May 2020
Additional Information:
Funding Information:
PAM would like to acknowledge funding from the EPSRC via the Graphene NOWNANO Centre for Doctoral Training. NTR would like to acknowledge the Royal Society (RG170150) for provision of funds to conduct this research. NB would like to acknowledge Lancaster University for an Early Career Internal Grant. XPS data collection was performed at the EPSRC National Facility for XPS (‘HarwellXPS’), operated by Cardiff University and UCL, under contract No. PR16195.
Publisher Copyright:
© 2020 Elsevier Ltd
Keywords:
Energy storage, MXenes, Zn-ion capacitors
Identifiers
Local EPrints ID: 439010
URI: http://eprints.soton.ac.uk/id/eprint/439010
ISSN: 0013-4686
PURE UUID: 8adecb42-a16f-4a45-bd81-e95f11d0bc5e
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Date deposited: 31 Mar 2020 16:31
Last modified: 17 Mar 2024 05:26
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Author:
Philip A. Maughan
Author:
Nuria Tapia-Ruiz
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