Publication date: 28th August 2024
In recent years, metal chalcogenides have emerged as prominent candidates as low-cost catalysts in renewable green technology applications. The scientific community has expressed significant interest in hydrogen production due to its potential as a clean alternative to fossil fuels, devoid of CO2 emissions, and its impressive energy density. 1
This project focuses on investigating NiSe, CoSe, and their ternary compounds, selected for their noteworthy electro-catalytic and photothermal properties, which raise the ability to generate a substantial increase in temperature, and enhance reaction kinetics (as per Arrhenius). 2
Previous efforts in this project concentrated on synthesizing, characterizing, and examining the basic electrochemical and photothermal properties of nanostructures. Synthesis of NiSe, CoSe, and ternary compounds with varying metal ratios yielded hexagonal nanoparticles in the 15-30 nm size range. These nanoparticles exhibited enhanced electro-catalytic activity in the hydrogen evolution reaction and demonstrated significant heating performance across different solvents and electrolytes. Furthermore, these nanoparticles were employed in advancing solar-driven membrane distillation technology, as part of a collaborative endeavor with Italian researchers. 3
Subsequently, the focus shifted to developing stable and suitable fluorine-doped tin oxide (FTO) electrodes for a new system, allowing the investigation of how the photothermal properties of nanoparticles influence the kinetics of the electrochemical hydrogen evolution reaction under illumination. A comprehensive analysis of kinetic parameters, including the activation energy of nanoparticles under various conditions, was conducted. These values offer insights into the degree to which temperature variations can impact the kinetics of an electrochemical reaction. Moreover, they can provide additional explanations for the differences in the activity observed among various catalysts. 4 In some instances, the nanoparticles exhibited lower activation energy than platinum (Pt). Additionally, an initial experiment was conducted integrating the new electrodes and the new system. Future work will focus on optimizing the new setup and exploring catalytic activity under illumination by leveraging the photothermal effect.
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