In-Plane Axially Enhanced Photocatalysis by Re4 Diamond Chains in Layered ReS2
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-07-25 |
| Journal | The Journal of Physical Chemistry C |
| Authors | Perumalswamy Sekar Parasuraman, Jhih-Hao Ho, Min-Han Lin, ChingāHwa Ho |
| Institutions | National Central University, National Taiwan University of Science and Technology |
| Citations | 16 |
Abstract
Section titled āAbstractāTwo-dimensional (2D) semiconductors play a crucial role in high-efficiency photocatalysts because of their high surface-to-volume ratio. The surface property is a key part of photocatalysis. In this work, the enhanced photocatalytic behavior of the layered ReS2 with optical polarization along the Re4 nano-diamond-chain (DC) direction (b axis) has been demonstrated. The unpolarized photoconductivity (PC) response of ReS2 with an applied bias along the b axis is approximately 1 order higher than that of the applied bias perpendicular to the b axis. The polarization-dependent PC spectra of E ā„ b also reveal a higher photoresponsivity with respect to those measured along the E ā„ b polarization for the layered ReS2. This result indicates that stronger polarization dipoles as well as a larger amount of photogenerated carriers and surface states can contribute to the C-plane ReS2 under the illumination of E ā„ b polarized photons. With the special axial effect, the layered ReS2 2D photocatalyst shows much faster degradation rates of 5.6 and 12.3 than the other transition-metal dichalcogenides of TaS2 and MoS2 for the degradation of methylene blue (MNB) solution. For the polarization-dependent photodegradation test, the degradation rate of illuminated E ā„ b polarized photons is also approximately 12 times faster than that of the illuminated E ā„ b polarized light in a 25 Ī¼M MNB solution. The enhanced photocatalytic behavior of ReS2 along the DC also shows a peak photoreponse of ā¼25 Ī¼V detected in the polarized photovoltaic spectrum of the 0.5 Ī¼M MNB dye-sensitized solar cell positioned at ā¼1.99 eV. The formation of a nano-DC and a one-layer trigonal crystalline phase is beneficial for the versatile energy applications of ReS2.