Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.567
Publication date: 16th December 2024
Transition metal nitrides have been discussed and tested for the purpose as catalysts for electrochemical nitrogen reduction reaction and demonstrated to be promising candidates for this reaction in aqueous electrolytes and ambient environment [1], [2]. In order to take the step from the sub-optimal environment for eNRR using thin film catalysts on solid electrodes to a more optimal environment with gas diffusion electrodes (GDE) for enhanced triple phase boundary and using nanoparticles for increased surface area aspect ratio, we have synthesized the selected transition metal nitrides using the urea gel route [3], [4], [5].
A significant amount of carbon is added to the catalysts through the catalyst synthesis method and due to sintering in N2(g) environment it may not all be removed as gaseous compounds. Therefore, the total catalyst (transition metal nitride) proportion in the powder needs to be known. We have used TGA-MS to identify the carbon and quantify the total metal proportion in the catalyst powder material. We have used XRD to analyze the crystal structure, SEM-EDS to analyse the particle morphology and C&N analysis to quantify N and C, this way allowing for a complete understanding of the powder chemical composition.
This work was supported by the Icelandic Fund for Technology Development [GA: 2321266-601, 2113091-0640], and the European Union, through project VERGE [HEU, GA: 101084253] Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Climate, Infrastructure and Environment Executive Agency. Neither the European Union nor the granting authority can be held responsible for them.
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