Fabrication of hierarchical SrTiO ₃ @MoS ₂ heterostructure nanofibers as efficient and low-cost electrocatalysts for hydrogen-evolution reactions

Abstract

Abstract 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 2 nanosheets on SrTiO 3 nanofibers (NFs) and 2D SrTiO 3 @MoS 2 heterostructure NFs are synthesized. In addition, SrTiO 3 @MoS 2 heterostructure NFs are compared with bare SrTiO 3 NFs and MoS 2 nanosheets. Importantly, the prepared SrTiO 3 @MoS 2 heterostructure shows better hydrogen-evolution reaction performance than other MoS 2 -based electrocatalysts with an overpotential of 165 mV at 10 mA cm −2 , a Tafel slope of 81.41 mV dec −1 , and long-term electrochemical durability of 3000 cycles. Therefore, the present work strongly demonstrates the positive synergy between SrTiO 3 NFs and layered MoS 2 , and also provides a strategy for preparing low-cost and high-activity water-decomposition electrocatalysts.