Fabrication of hierarchical SrTiO@MoS heterostructure nanofibers as efficient and low-cost electrocatalysts for hydrogen-evolution reactions.

The construction of low-cost, high-performance electrocatalysts instead of platinum catalysts is critical to solving the energy crisis. Here, using simple electrospinning and hydrothermal methods, new MoS nanosheets on SrTiO nanofibers (NFs) and 2D SrTiO@MoS heterostructure NFs are synthesized. In addition, SrTiO@MoS heterostructure NFs are compared with bare SrTiO NFs and MoS nanosheets. Importantly, the prepared SrTiO@MoS heterostructure shows better hydrogen-evolution reaction performance than other MoS-based electrocatalysts with an overpotential of 165 mV at 10 mA cm, a Tafel slope of 81.41 mV dec, and long-term electrochemical durability of 3000 cycles. Therefore, the present work strongly demonstrates the positive synergy between SrTiO NFs and layered MoS, and also provides a strategy for preparing low-cost and high-activity water-decomposition electrocatalysts.