Journal
ACS NANO
Volume 16, Issue 2, Pages 2921-2927Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10030
Keywords
MoS2; monolayer; thermal effects; hydrogen evolution; on-chip
Categories
Funding
- China Scholarship Council (CSC)
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This study designed and fabricated an on-chip MoS2 ML HER reactor, revealing the direct thermal enhancement of MoS2 ML for HER activity. The experimental results showed that the MoS2 ML measured at a higher temperature has higher activity and lower overpotential.
MoS2 has drawn great attention as a promising alternative to Pt-based catalysts for the hydrogen evolution reaction (HER). However, it suffers from sluggish kinetics to drive the HER process because of inert basal planes. Here, an on-chip MoS2 monolayer (MoS2 ML) HER reactor was designed and fabricated to reveal direct thermal enhancement of MoS2 ML for the HER. The thermal effects generated efficient electron transfer in the atomic MoS2 ML and at the interface between the electrolyte and the catalyst, leading to enhanced HER activity. The MoS2 ML measured at a higher temperature (60 degrees C) possesses a significantly enhanced HER activity with a lower overpotential (90 mV at current densities of 10 mA cm(-2)), lower Tafel slope (94 mV dec(-1)), and higher turnover frequency (73 s(-1) at an overpotential of 125 mV) compared to the results obtained at room temperature. More importantly, the findings are attractive toward understanding the thermal effect on 2D monolayers as well as the development of next-generation electrocatalysts.
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