期刊
ACS NANO
卷 10, 期 1, 页码 672-683出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05907
关键词
catalysis; edge; electrical resistance limited; active sites
类别
资金
- Science Foundation Ireland [11/PI/1087]
- European Research Council (SEMANTICS)
- European Union [604391]
- Science Foundation Ireland (SFI) [SFI/12/RC/2278]
- Science Foundation Ireland (SFI) [11/PI/1087] Funding Source: Science Foundation Ireland (SFI)
Here we demonstrate that the performance of catalytic electrodes, fabricated from liquid exfoliated MoS2 nanosheets, can be optimized by maximizing the electrode thickness coupled with the addition of carbon nanotubes. We find the current, and so the H-2 generation rate, at a given potential to increase linearly with electrode thickness to up similar to 5 mu m after which saturation occurs. This linear increase is consistent with a simple model which allows a figure of merit to be extracted. The magnitude of this figure of merit implies that approximately two-thirds of the possible catalytically active edge sites in this MoS2 are inactive. We propose the saturation in current to be partly due to limitations associated with transporting charge through the resistive electrode to active sites. We resolve this by fabricating composite electrodes of MoS2 nanosheets mixed with carbon nanotubes. We find both the electrode conductivity and the catalytic current at a given potential to increase with nanotube content as described by percolation theory.
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