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Microwave-Assisted Reactant-Protecting Strategy toward Efficient MoS2 Electrocatalysts in Hydrogen Evolution

Ning Liu¹, Yulin Guo¹, Xiaoyun Yang¹

¹Department of Chemistry, Jinan University , No. 601 Huangpu Avenue West, 510632 Guangzhou, P. R. China.

ACS Applied Materials & Interfaces

|October 9, 2015

Summary

A new microwave-assisted method uses thiourea to protect active sites in molybdenum disulfide (MoS2) nanocatalysts, significantly boosting hydrogen evolution reaction (HER) efficiency.

Keywords:

active sites hydrogen evolution microwave molybdenum disulfide reactant-protecting

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Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Molybdenum disulfide (MoS2) nanocatalysts are crucial for the hydrogen evolution reaction (HER).
High surface energy of active planes (010) and (100) leads to their disappearance during MoS2 preparation.
Efficient HER requires abundant exposed active sites on MoS2.

Purpose of the Study:

To develop a novel strategy for fabricating active-site-rich MoS2 (AS-rich MoS2) with enhanced HER performance.
To investigate the role of thiourea (TU) as both a reactant and capping agent in protecting active sites.
To elucidate the mechanism of interface engineering for high-performance nanocatalysts.

Main Methods:

Microwave-assisted synthesis utilizing thiourea (TU) as a reactant and capping agent.
Fabrication of AS-rich MoS2 through a reactant-protecting strategy.
Characterization of HER activity, including current density, Tafel slope, and onset overpotential.

Main Results:

Successfully synthesized AS-rich MoS2 with rich catalytic sites and promoted conductivity.
Achieved superior HER activity: high current density (68 mA cm(-2) at -300 mV vs RHE), low Tafel slope (53.5 mV dec(-1)), and low onset overpotential (180 mV).
Demonstrated the bifunctional role of TU in protecting and exposing active sites without additional surfactants.

Conclusions:

The microwave-assisted reactant-protecting strategy is a feasible and effective method for producing high-performance MoS2 nanocatalysts.
Interface engineering via TU protection significantly enhances MoS2 catalytic activity for HER.
This approach offers a promising direction for developing advanced nanocatalysts for energy applications.