Molybdenum Sulfide Nanosheet-Based Hollow Porous Flat Boxes and Nanotubes for Efficient Electrochemical Hydrogen Evolution

Intriguing amorphous/quasiamorphous molybdenum sulfide (MoSx) materials with active terminal disulfide S-2(2-) units have been recognized recently as prominent catalysts for the hydrogen evolution reaction (HER). Here, we diversify the MoSx morphologies and structures by a facile template-free solvothermal method to prepare fascinating MoSx nanosheet-based hollow porous flat boxes and nanotubes. As we increase the ethanol concentration in the mixed solvent for the reaction from 60 to 100vol%, highly dispersed MoSx materials are obtained and the morphologies change from nanosheet to nanosheet-based hollow porous nanotubes and ultimately to nanosheet-based hollow porous flat boxes with the increasing S-2(2-) content. Catalytic measurements demonstrate that the hollow porous MoSx flat boxes and nanotubes have similar outstanding HER performances and can reach 10mAcm(-2) current at overpotentials of approximately 206 and 210mV, respectively.