Photocatalytic activity of twist-angle stacked 2D TaS2
Evgeniya Kovalska, Pradip Kumar Roy, Nikolas Antonatos, Vlastimil Mazánek, Martin Veselý, Bing Wu, Zdeněk Sofer
Abstract
Abstract The low-cost, efficient photoelectrosensitive electrodes as an alternative to expensive and complex rigid systems are yet in demand for advanced photoresponsive technology. Here, the light-induced efficiency of electrochemically exfoliated TaS 2 nanosheets for hydrogen generation catalysis and photodetectors was demonstrated. Mutual twisting of the exfoliated 2H-TaS 2 flakes leads to the redistribution of charge density induced by interlayer interaction of the individual nanosheets. External light irradiation on the TaS 2 surface influences its conductivity making the material feasible for photoelectrocatalysis and photodetection. The TaS 2 -based photoelectrocatalyst demonstrates high hydrogen evolution reaction (HER) activity with the onset overpotential below 575 mV vs. reversible hydrogen electrode (RHE). The TaS 2 -integrated photodetector in the acidic medium represents its broadband response with the highest photoresponsivity (0.62 mA W −1 ) toward 420 nm light illumination. This finding will pave the way to a new realization of exfoliated twist-angle stacked TaS 2 for photo-induced electrochemistry and sensing.