Flexible MoS2 nanosheets/polypyrrole nanofibers for highly efficient electrochemical hydrogen evolution

Hierarchical MoS2 nanosheets/polypyrrole nanofibers (MoS2 NSs@PPy NFs) core/shell nanostructures were successfully fabricated through a simple and environmentally friendly method by using PPy nanofibers as the core and MoS2 NSs as the shell. The as-fabricated three dimensional MoS2 NSs@PPy NFs proved to be the effective hydrogen evolution reaction (HER) catalyst, which only needed 60 and 196 mV overpotential to approach 10 and 100 mA cm−2, respectively. Furthermore, a small Tafel slope of 33 mV dec−1 and low onset overpotential of 20 mV were achieved, which were smaller than the previously reported values. The MoS2 NSs@PPy NFs catalyst may hold great potential for practical applications.