摘要
This study theoretically and experimentally investigates the piezocatalytic and adsorption effects of different phases of polymorphic 1T MoS 2 NFs. Piezoresponse force microscopy indicates a considerably high piezoelectric potential (piezopotential) at the few-layer 2H MoS 2 NFs (40 mV), which is eight times higher than that at the few-layer MoS 2 NFs (4.9 mV). This finding is confirmed by calculations based on density functional theory (DFT) and the finite element method (FEM). To verify whether the polymorphic MoS 2 NFs would exhibit adsorption or piezocatalytic effects, the electrostatic surface charge of these NFs and the RhB solution is varied using sodium hydroxide and nitric acid solutions. The cationic dye is adsorbed on the surfaces of the 1T MoS 2 NFs; however, the few-layer 2H MoS 2 NFs generate a considerable quantity of hydroxyl species for degrading RhB molecules through the mechanical-force-induces piezopotential. This study discovers that the polymorphic MoS 2 NFs exhibit a piezocatalysis–adsorption duality.