Composite MAX phase/MXene/Ni electrodes with a porous 3D structure for hydrogen evolution and energy storage application

MXenes, a family of two-dimensional (2D) transition metal carbides, have been discovered as exciting candidates for various energy storage and conversion applications, including green hydrogen production by water splitting. Today, these materials mostly remain interesting objects for in-depth fundam...

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Bibliographic Details
Published in:	RSC advances Vol. 14; no. 5; pp. 352 - 369
Main Authors:	Sergiienko, Sergii A, Lajaunie, Luc, Rodríguez-Castellón, Enrique, Constantinescu, Gabriel, Lopes, Daniela V, Shcherban, Nataliya D, Calvino, Jos J, Labrincha, João A, Sofer, Zdenek, Kovalevsky, Andrei V
Format:	Journal Article
Language:	English
Published:	England Royal Society of Chemistry 17-01-2024 The Royal Society of Chemistry
Subjects:	Carbon content Chemistry Electrodes Energy storage Functional materials Green hydrogen Hydrogen evolution reactions Hydrogen production Industrial applications Metal carbides MXenes Nickel Titanium Transition metals Water splitting
Online Access:	Get full text
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Summary:	MXenes, a family of two-dimensional (2D) transition metal carbides, have been discovered as exciting candidates for various energy storage and conversion applications, including green hydrogen production by water splitting. Today, these materials mostly remain interesting objects for in-depth fundamental studies and scientific curiosity due to issues related to their preparation and environmental stability, limiting potential industrial applications. This work proposes a simple and inexpensive concept of composite electrodes composed of molybdenum- and titanium-containing MAX phases and MXene as functional materials. The concept is based on the modification of the initial MAX phase by the addition of metallic Ni, tuning Al- and carbon content and synthesis conditions, followed by fluoride-free etching under alkaline conditions. The proposed methodology allows producing a composite electrode with a well-developed 3D porous MAX phase-based structure acting as a support for electrocatalytic species, including MXene, and possessing good mechanical integrity. Electrochemical tests have shown a high electrochemical activity of such electrodes towards the hydrogen evolution reaction (HER), combined with a relatively high areal capacitance (up to 10 F cm −2 ). The MAX phase/MXene/Ni composite with 3D porous structure prepared was assessed for energy conversion and storage application, using the hydrogen evolution reaction under alkaline conditions as a model system.
Bibliography:	https://doi.org/10.1039/d3ra07335a Electronic supplementary information (ESI) available. See DOI ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2046-2069 2046-2069
DOI:	10.1039/d3ra07335a