Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 11, Issue 1, Pages 168-176Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c05106
Keywords
MXene; Mesopore; Nanoarchitecture; Molybdenum carbide; Hydrogen evolution reaction
Categories
Funding
- China Scholarship Council (CSC)
- National Natural Science Foundation of China [61774122, 52002329]
- Key Science and Technology Developing Project of Shaanxi Province [2020KWZ-004]
- China Postdoctoral Science Foundation [2020TQ0244, 2021M702658]
- Fundamental Research Funds for the Central Universities [D5000200415]
- 111 Project of China [B14040]
- Japan Society for the Promotion of Science (JSPS) [20K05453]
- JST-ERATO Yamauchi Materials Space-Tectonics Project [JPMJER2003]
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This study describes a 2D MXene-based mesoporous nanoarchitecture with ordered mesoporous carbon layers and molybdenum carbide nanodots. The mesopores increase the material's surface area, expose active sites, and improve the performance in the hydrogen evolution reaction. The structure exhibits excellent long-term stability.
Two-dimensional (2D) MXene-based mesoporous heterostructures are promising electrode materials for electro-chemical charge storage but have rarely been examined as electrocatalysts for hydrogen production reactions. Herein, we describe a 2D MXene-based mesoporous nanoarchitecture consisting of 2D Ti3C2 (MXene) nanosheets sandwiched between ordered mesoporous nitrogen-doped carbon (mNC) layers coupled molybdenum carbide (MoC) nanodots (denoted as mNC-MoC/Ti3C2). The results show that mesopores significantly increase the specific surface area of the material and expose numerous electrocatalytically active sites. Mesopores also shorten the distance of ion transport to the inner surface of the catalyst and accelerate the kinetics of the catalytic reaction. The resulting mNC-MoC/Ti3C2 structure exhibits excellent performance in the hydrogen evolution reaction (HER) in 0.5 M H2SO4, with a small overpotential of 159 mV at 10 mA cm(-2), a low Tafel slope of 70.9 mV dec-1, and excellent long-term stability. Theoretical calculations indicate that the mNC-MoC/Ti3C2 surface has a small hydrogen binding energy for the favorable adsorption- desorption of hydrogen and high conductivity for rapid charge transfer during the HER process.
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