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Sabeth, Farzana,Islam, Md. Serajul,Endo, Tadashi,Ohta, Nobuhiro Korean Society of Photoscience 2015 Rapid communication in photoscience Vol.4 No.1
The time-resolved photoexcitation dynamics of electrical conductivity of the magnetic organic superconductor ${\lambda}-(BETS)_2Fe_{0.45}Ga_{0.55}Cl_4$ has been studied with a nanosecond visible laser pulse at its three different phases, i. e., metallic phase, superconducting phase and insulating phase. A transient increase of the resistance is induced by photoirradiation at all the temperatures measured for all three phases, but the decay profile shows a significant temperature dependence. The relaxation rate in the metallic and insulating phase are different from each other, and the decay time is relatively faster and almost constant in the metallic phase. However, a prolongation of the relaxation time is observed at temperature just around the narrow superconducting phase. Nonbolometric (nonthermal) origin of the observed photoresponse of the electrical conductivity is confirmed in the superconducting phase.
Electrochemical CO2 Reduction over a MoS2/Mo Electrode
황선영,주민희,맹주영,박고은,양서영,이충균,손영구 한국진공학회 2023 Applied Science and Convergence Technology Vol.32 No.2
Molybdenum disulfide (MoS2) is a promising material for energy and environmental applications. In this paper, we report the direct hydrothermal growth of MoS2 on a Mo support and its application in the rarely explored electrochemical CO2 reduction (EC CO2R) process. To investigate the effects of metal overlayers and the MoS2 support, Au, Ag, and Cu were sputter-deposited on a MoS2 electrode. Large amounts of CH4, C2−3 hydrocarbons, and formate were produced via EC CO2R on bare MoS2. The introduction of a Au overlayer on MoS2 enhanced the production of CO, methanol, and formate. Furthermore, the alkanes (C H2 +2, = 2, 3) to alkenes (C H2 , = 2, 3) ratio was dependent on the applied potential and overlayer metals. Notably, photoirradiation remarkably increased the CO and C2H4 concentrations by 28-fold and 10-fold, respectively. These findings provide valuable insights for the development of MoS2-based materials for CO2 recycling.