Premium
W‐Doped MoO 2 /MoC Hybrids Encapsulated by P‐Doped Carbon Shells for Enhanced Electrocatalytic Hydrogen Evolution
Author(s) -
Lv Cuncai,
Huang Zhipeng,
Yang Qianpeng,
Zhang Chi
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700851
Subject(s) - overpotential , electrocatalyst , materials science , catalysis , molybdenum , mesoporous material , tafel equation , chemical engineering , electrochemistry , electrolyte , oxide , doping , inorganic chemistry , electrode , chemistry , metallurgy , organic chemistry , optoelectronics , engineering
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 (MoO 2 /MoC) nanoparticles encapsulated by phosphorus (P)‐doped carbon shells (W‐MoO 2 /MoC@PC) as an efficient electrocatalyst using this technique. The utilization of SiO 2 as a hard template endows W‐MoO 2 /MoC@PC with a mesoporous structure, and the effective W‐doping further enhances the HER electrocatalytic performance of W‐MoO 2 /MoC@PC catalyst. As expected, W‐MoO 2 /MoC@PC shows a low overpotential ( η 20 =208 mV in 0.5 m H 2 SO 4 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.