Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
To solve the climate emergency produced from the extended use of fossil fuels, new sources of energy are required. Hydrogen resulting from water electrolysis is a renewable energy carrier which holds great promise for wide use in a post fossil fuel economy. For this reason, research for the development of alternative to noble-metal-based electrodes for electrocatalytic water splitting has blossomed in recent years. Transition metal carbides (TMCs) compounds have been considered as a promising alternative to replace Pt-family metals as electrocatalysts towards the cathodic hydrogen evolution reaction (HER). Moreover, hybridization of TMCs with graphene nanostructures has emerged as a reliable strategy for the preparation of compounds with high surface to volume ratio and improved charge transfer kinetics. In this work, it is present an overview of our recent work regarding the preparation of TMCs/ graphene hybrid electrodes, both in the form of vertical heterostructures consisting of single layer graphene and few layer thick TMCs, as well as in the form of three-dimensional vertical graphene nanowalls decorated with TMC compounds [1-5]. For the preparation, it used chemical vapor deposition on liquid metallic substrates for the vertical heterostructures and ICP-CVD combined with sputtering, or impregnation, for the three-dimensional compounds. The advantages of each method and efficiency of the prepared electrode towards HER are critically discussed.
The authors acknowledge financial support from Grants TED2021-132070B-C21 and PID2020-116612RB-C32 funded by the Spanish Ministry for Science and Innovation and support from the AGAUR of Generalitat de Catalunya, through Project No. 2021SGR00936. . S. C. acknowledges support from the MSCA fellowship funded by the European Commission through grant agreement 101062014 (HORIZON Europe-MSCA-2021-PF-01).
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