With the optimized phase composition, WC/W NWs (WC : W 2C ≈ 1 : 1.3) display the low overpotentials of 69 mV and 56 mV at the cathodic current density of 10 mA cm −2 and small Tafel slopes of 52 and 59 mV dec −1 in 0.5 M H 2SO 4 and 1 M KOH, respectively. Herein, ultrafine cable-like WC/W 2C heterojunction nanowires (NWs) covered by few-layer N-doped graphite-like carbon (labeled WC/W NWs) have been firstly accomplished via a simple two-step pyrolysis treatment of W 18O 49 NWs precursor, exhibiting tunable phase composition, excellent HER activity, fast kinetic metrics and remarkable stability along the entire pH range.
Developing highly active, durable and economical noble-metal-free electrocatalysts for the hydrogen evolution reaction (HER) plays a crucial role in the future hydrogen economy.
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