A recent study has proposed a strategic approach to designing high-performance photocatalysts, offering potential applications in sustainable energy production and environmental remediation.
Two-dimensional (2D) materials, with their high absorption coefficients and ability to efficiently generate electron-hole pairs, are emerging as strong contenders for photocatalytic applications. Their tunable bandgap, large surface area, and reduced charge carrier path length enhance their performance while allowing for seamless integration into diverse device architectures. However, a significant challenge lies in overcoming the issue of strongly bound excitons—electron-hole pairs—that limit the effectiveness of these materials in driving catalytic reactions requiring free charge carriers.
Scientists from the Institute of Nano Science and Technology (INST), Mohali, have addressed this limitation by studying the ground- and excited-state dynamics of excitons in a heterostructure made of a 2D material known as metal-telluro-halide. Their research, supported by the Department of Science and Technology, suggests that engineering 2D materials with high electrical resistivity (dielectric materials) can regulate exciton binding energy (EBE), thereby enhancing their catalytic efficiency.
Published in the Journal of Physical Chemistry C, the study demonstrated how applying a magnetic field accelerates charge separation in these materials by exerting opposing forces on photogenerated electrons and holes. While the magnetic field enhances EBE through an exciton diamagnetic shift, which might hinder charge separation, the researchers showed that a highly delocalised exciton cloud could effectively reduce EBE to a level that promotes the dissociation of excitons into free charge carriers.
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Using the PARAM-Smriti supercomputing facility at NABI, supported by CDAC, Pune, under the National Supercomputing Mission, the team led by Prof. Abir De Sarkar, along with PhD scholars Amal Kishore and Harshita Seksaria, explored the GaTeCl/InTeBr vdW heterostructure. Their findings revealed its ability to efficiently split water into hydrogen, a clean energy source, while also being capable of producing solar fuels like methanol. Additionally, the material’s photocatalytic properties were shown to degrade pollutants, contributing to cleaner air and water.
The roadmap laid out in this study highlights the transformative potential of advanced 2D materials in creating a more sustainable future.
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