Highly active and durable nanostructured molybdenum carbide electrocatalysts for hydrogen production

被引：865

作者：

Chen, W. -F. ^{[1
]}

Wang, C. -H. ^{[1
,2
]}

Sasaki, K. ^{[1
]}

Marinkovic, N. ^{[3
]}

Xu, W. ^{[1
]}

Muckerman, J. T. ^{[1
]}

Zhu, Y. ^{[2
]}

Adzic, R. R. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[2] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[3] Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2013年 / 6卷 / 03期

关键词：

TUNGSTEN CARBIDE; CATALYTIC-ACTIVITY; THERMAL-DECOMPOSITION; EVOLUTION REACTION; NANOPARTICLES; NANOTUBES; EFFICIENT; SURFACES; SULFIDE; MO2C;

D O I：

10.1039/c2ee23891h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In an attempt to tailor low-cost, precious-metal-free electrocatalysts for water electrolysis in acid, molybdenum carbide (beta-Mo2C) nanoparticles are prepared by in situ carburization of ammonium molybdate on carbon nanotubes and XC-72R carbon black without using any gaseous carbon source. The formation of Mo2C is investigated by thermogravimetry and in situ X-ray diffraction. X-ray absorption analysis reveals that Mo2C nanoparticles are inlaid or anchored into the carbon supports, and the electronic modification makes the surface exhibit a relatively moderate Mo-H bond strength. It is found that carbon nanotube-supported Mo2C showed superior electrocatalytic activity and stability in the hydrogen evolution reaction (HER) compared to the bulk Mo2C. An overpotential of 63 mV for driving 1 mA cm(-2) of current density was measured for the nanotube-supported Mo2C catalysts; this exceeds the activity of analogous Mo2C catalysts. The enhanced electrochemical activity is facilitated by unique effects of the anchored structure coupled with the electronic modification.

引用

页码：943 / 951

页数：9

共 45 条

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