W‐Doped MoO2/MoC Hybrids Encapsulated by P‐Doped Carbon Shells for Enhanced Electrocatalytic Hydrogen Evolution

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Abstract
Ultrasonic spray pyrolysis (USP), as an industrially‐scalable synthetic technique used to prepare mesoporous products, has rarely been developed for accessing porous metal carbide hybrids for electrochemical hydrogen evolution reaction (HER). Herein, we report a mesoporous hybrid consisting of tungsten (W)‐doped molybdenum oxide/molybdenum carbide (MoO2/MoC) nanoparticles encapsulated by phosphorus (P)‐doped carbon shells (W‐MoO2/MoC@PC) as an efficient electrocatalyst using this technique. The utilization of SiO2 as a hard template endows W‐MoO2/MoC@PC with a mesoporous structure, and the effective W‐doping further enhances the HER electrocatalytic performance of W‐MoO2/MoC@PC catalyst. As expected, W‐MoO2/MoC@PC shows a low overpotential (η20=208 mV in 0.5 m H2SO4 and 209 mV in 1.0 m KOH for reaching a current density of 20 mA cm−2), and good stability in both acidic and basic electrolyte, which is a promising noble‐metal‐free HER catalyst. Moreover, this facile synthesis strategy is also suitable for preparing other metal‐doped Mo‐based nanocomposites, which can be used in the fields of electrocatalytic water splitting and energy conversion.
Funding Information
  • National Natural Science Foundation of China (51772214, 51432006)
  • Ministry of Education of the People's Republic of China (IRT14R23)
  • Government of Jiangsu Province (2011-XCL-019, 2013-479)

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