Electrospun carbon nanofiber@CoS2 core/sheath hybrid as an efficient all-pH hydrogen evolution electrocatalyst

摘要: Developing all-pH and efficient non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) remains a great challenge in science nowadays. In this work, carbon nanofiber (CNF)@CoS2 hybrids with hierarchical core/sheath structure have been successfully fabricated via combination of electrospinning hydrothermal methods use as HER under media. The CoS2 nanoparticles are uniformly attached onto three-dimensional (3D) CNF framework, different morphologies on adjusting concentration Co S precursors. This shows that morphology electrocatalytically active has impact performance, which can be attributed to difference exposure effective catalytic sites. Moreover, CNF@CoS2 distinctly exhibit superior activities compared pure agglomerates, highlights importance 3D carrier nanostructure increase number exposed electrocatalytic When applied operating at values, remarkable properties, low onset potential −40 mV, small Tafel slope 66.8 mV per decade large current density (10.0 mA cm−2 η = 110 mV) acid medium, along −130 both alkaline neutral conditions. Apart from facile preparation an electrocatalyst, work impacts catalyst activity, is universally applicable field catalysis.