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▲ [11p-W521-6] Large voltage generator from water movement by single-layer MoS2
Keywords:MoS2, energy harvesting, TMDCs
Water conserve tremendous amount clean energy in its dynamic forms. Recently, the effort to directly extract energy from water motion is gaining large interest. Two-dimensional (2D) materials, such as graphene and transition metal dichalcogenides (TMDCs), are promising materials as energy harvester for this purpose due to their exceptional electrical properties and sensitivity to the environment. For instances, graphene is reported could harvest energy from the movement of a small water droplet.1,2 However, the generated voltage using graphene-based system is usually small (millivolt order). Here, we demonstrated an alternative approach by employing single-layer MoS2, another 2D materials, film to harvest the energy from liquid movement. We obtained a larger voltage by using MoS2 compared with graphene-based generator reported so far.
Figures 1a,b show photograph of the device and schematic view of the experimental setup of voltage generation by liquid movement. The voltage can be generated from liquid movement either by dragging 1M aqueous NaCl on MoS2 film with motor stage or by dropping liquid onto MoS2 film to mimic raindrops. The generated voltage of ~5.9 V was obtained by dropping 50 μL of liquids (green shaded area in Fig. 1c). When the device was inclined at 45º, the liquid moved on MoS2 film hydrophobicity of MoS2. Finally, the output power of 1.75 nW could be harvested by connecting to load resistors (Fig. 1d). <link href="chrome-extension://debnnjfbneojbmioajinefnflopdohjk/skin/s3gt_tooltip_mini.css" rel="stylesheet" type="text/css" /><style media="print" type="text/css">#s3gt_translate_tooltip_mini { display: none !important; }</style>
Figures 1a,b show photograph of the device and schematic view of the experimental setup of voltage generation by liquid movement. The voltage can be generated from liquid movement either by dragging 1M aqueous NaCl on MoS2 film with motor stage or by dropping liquid onto MoS2 film to mimic raindrops. The generated voltage of ~5.9 V was obtained by dropping 50 μL of liquids (green shaded area in Fig. 1c). When the device was inclined at 45º, the liquid moved on MoS2 film hydrophobicity of MoS2. Finally, the output power of 1.75 nW could be harvested by connecting to load resistors (Fig. 1d). <link href="chrome-extension://debnnjfbneojbmioajinefnflopdohjk/skin/s3gt_tooltip_mini.css" rel="stylesheet" type="text/css" /><style media="print" type="text/css">#s3gt_translate_tooltip_mini { display: none !important; }</style>