The Synthesis And Electrochemical Catalyzing Application Of Carbon Nanotube And Molybdenum Disulfide

The new high efficient and inexpensive electro-catalysts are critical important to both environmental protection and green energy area.In this thesis,we study the synthesis and properties of low dimension composite electro-catalysts.The synthesis methods of good surface contact composite has been explore,and the influences of different post-treatment condition to the performance of electro-catalysts has been carefully studied.In the experiment we synthesized carbon nanotube films(CNT films)via a chemical vapor deposition method(CVD).After purification,molybdenum disulfide has been grown on CNT films also by a CVD process.By etching the obtained MoS2@CNT with 10%wt HNO3,the morphology of MoS2 decorated on CNT bundles was modulated,characterized by scanning electronic microscopy,transmission electronic microscopy,Raman spectrum and X-ray photoelectron spectrum.This morphology change has resulted in more catalytic active MoS2 edges being exposed for significantly enhanced electrochemical performance.Our results revealed that an 8 h acid etching sample exhibited the best performance for the oxygen evolution reaction,i.e.,the current density reached 10 mA/cm2 under 375 mV over-potential,and the tafel slope was as low as 94 mV/dec.The enhanced behavior was mainly originated from the more catalytic sites in MoS2 induced by the acid etching treatment and the higher conductivity from the supporting CNT films.Our study provides a new route to produce two-dimensional layers on CNT films with tunable morphology,and thus may open a window for exploring its promising applications in the fields of catalytic-,electronic-,and electrochemical-related fields.