Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 28, Pages 18107-18118Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05007
Keywords
nanocasting method; mesoporous Mo2C nanocrystals; precious-metal-free electrocatalyst; two-dimensional layered structure; hydrogen evolution reaction
Funding
- NSFC [21261011]
- Application Program from Inner Mongolia Science and Technology Department
- Program for New Century Excellent Talents in University [NCET-10-0907]
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A universal strategy was developed for fabrication of a highly active and durable precious-metal-free mesoporous Mo2C/graphene (m-Mo2C/G) electrocatalyst with a two-dimensional layered structural feature via a nanocasting method using glucose as a carbon source and an in-stiu assembled mesoporous KIT-6/graphene (KIT-6/G) as a template. The m-Mo2C/G catalyst exhibits high catalytic activity and excellent durability for hydrogen evolution reaction (HER) over a wide pH range, which displays a small onset potential of 8 mV, owerpotential (eta(10)) for driving a cathodic current density of 10 mA.cm(-2) of 135 mV, a Tafel slope of 58 mV.dec(-1), and an exchange current density of 6.31 X 10(-2) mA.cm(-2) in acidic media and an onset potential of of 41 mV, eta(10) of 128 mV, Tafel slope of 56 mV.dec(-1), and an exchange current density of 4.09 X 10(-2) mA.cm(-2) in alkaline media, respectively. Furthermore, such an m-Mo2C/G electrocatalyst also gives about 100% Faradaic yield and shows excellent durability during 3000 cycles of a long-term test, and the catalytic current remains stable over 20 h at fixed overpotentials, making it a great potential application prospect for energy issues.
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