Modular design of an efficient heterostructured FeS<inf>2</inf>/TiO<inf>2</inf>oxygen evolution electrocatalyst: Via sulfidation of natural ilmenites
- Publisher:
- Royal Society of Chemistry
- Publication Type:
- Journal Article
- Citation:
- Journal of Materials Chemistry A, 2021, 9, (44), pp. 25032-25041
- Issue Date:
- 2021-11-28
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| d1ta08168c.pdf | 1.32 MB |
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Developing cost-effective and durable catalysts for the oxygen evolution reaction (OER) is of great interest for advanced energy conversion and carbon neutrality schemes. Here, we demonstrate a modular design strategy to engineer an efficient heterostructured electrocatalyst FeS2/TiO2 (S-FTO) via a sulfidation process on natural ilmenites (FTO), which integrates high OER activity, good conductivity, and high stability. The modular catalyst, S-FTO catalyst, shows a low overpotential of 230 mV to achieve 10 mA cm-2, as well as excellent stability in alkaline solution. Typically, S-FTO exhibits OER activity 19 times higher than FTO at an overpotential of 300 mV. In-depth investigations indicate that the high OER activity of S-FTO mainly originates from accelerated surface self-reconstruction induced by lattice S etching within the OER potential region, and the newly formed FeOOH on the outer layer acts as the active species for the OER. The remaining FeS2 regulates the surface electronic properties and enhances the conductivity, while TiO2 improves the stability. The modular design strategy demonstrated here will enable the design of low-cost heterostructures as high-efficiency catalysts for challenging energy storage/conversion reactions in an eco-friendly and sustainable manner. This journal is
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