Iron diselenide nanoplatelets: Stable and efficient water-electrolysis catalysts
Abstract The development of efficient water-electrolysis catalysts plays a key role in clean and sustainable energy sources. In this work, 2D FeSe 2 nanoplatelets have been successfully synthesized via a hydrothermal reduction route, which exhibit extraordinarily high catalytic activities and stability for oxygen evolution reaction (OER). The remarkable electrocatalytic performance of FeSe 2 nanoplatelets (e.g., overpotential: 2.2 times higher than that of commercial RuO 2 at 500mV; Tafel slope: 48.1mV/dec; steady-state current densities remain constant after 70h) can be attributed to highly exposed active sites associated with (210) crystal faces; the 2D nanostructure could also facilitate improvement of kinetics of water oxidation. Furthermore, the changes of energy level, band structure and water adsorption ability of FeSe 2 under different bias were further understood based on density functional theory calculation. Therefore, this work provides the first example of FeSe 2 nanoplatelets as OER application, which may open a new avenue to design and explore other Fe-based nanostructures as efficient catalysts for renewable energy. Highlights 2D FeSe 2 nanoplatelets have been successfully synthesized via a hydrothermal reduction route. The 2D FeSe 2 nanoplatelets exhibited extraordinarily high catalytic activities and stability for OER. The energy level and water adsorption ability of FeSe 2 under different bias were understood based on DFT calculation. Graphical abstract [DISPLAY OMISSION] This work provides the application of FeSe 2 nanoplatelets in oxygen evolution reaction. Experimental and theoretical studies confirm that FeSe 2 is a promising candidate as noble metal-free electrocatalyst for water splitting and energy conversion.
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