Growing and Etching MoS(2) on Carbon Nanotube Film for Enhanced Electrochemical Performance

In this work we directly synthesized molybdenum disulfide (MoS(2)) nanosheets on carbon nanotube film (MoS(2)@CNT) via a two-step chemical vapor deposition method (CVD). By etching the obtained MoS(2)@CNT into 10% wt HNO(3), the morphology of MoS(2) decorated on CNT bundles was modulated, resulting in more catalytic active MoS(2) 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/cm(2) 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 MoS(2) 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.