新しい電極触媒は、より安価な水素燃料に希望をもたらす(New electrocatalyst offers hope for less expensive hydrogen fuel)

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2022-06-03 バッファロー大学(UB)

二硫化モリブデンにさらに2種類の材料(MXenesとカーボンナノチューブとして知られる無機化合物の一種)を加えて濃縮すると、電極触媒として白金に取って代わる可能性があり、燃料電池電気自動車、発電、その他の用途で水素をより広く採用できるようになると示唆されている。

<関連情報>

二相MoS2/MXene/CNT三元系ナノハイブリッドによる高効率電極触媒的水素生成の実現 Dual-phase MoS2/MXene/CNT ternary nanohybrids for efficient electrocatalytic hydrogen evolution

Sichen Wei,Yu Fu,Maomao Liu,Hongyan Yue,Sehwan Park,Young Hee Lee,Huamin Li & Fei Yao
Npj 2D Materials and Applications  Published:05 April 2022
DOI:https://doi.org/10.1038/s41699-022-00300-0

Abstract

Two-dimensional (2D) molybdenum disulfide (MoS2) has been recognized as a potential substitution of platinum (Pt) for electrochemical hydrogen evolution reaction (HER). However, the broad adoption of MoS2 is hindered by its limited number of active sites and low inherent electrical conductivity. In this work, we employed a one-step solvothermal synthesis technique to construct a ternary hybrid structure consisting of dual-phase MoS2, titanium carbide (Ti3C2) MXene, and carbon nanotubes (CNTs), and demonstrated synergistic effects for active site exposure, surface area enlargement, and electrical conductivity improvement of the catalyst. The dual-phase MoS2 (DP-MoS2) is directly formed on the MXene with CNTs acting as crosslinks between 2D islands. The existence of edge-enriched metallic phase MoS2, the conductive backbone of MXene along with the crosslink function of CNTs clearly improves the overall HER performance of the ternary nanocomposite. Moreover, the integration of MoS2 with MXene not only increases the interlayer distance of the 2D layers but also partially suppresses the MXene oxidation and the 2D layer restacking, leading to good catalytic stability. As a result, an overpotential of 169 mV and a low Tafel slope of 51 mV/dec was successfully achieved. This work paves a way for 2D-based electrocatalyst engineering and sheds light on the development of the next-generation noble metal-free HER electrocatalysts.

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