Single-layer MoS2 nanopores as nanopower generators
Single-layer MoS2 nanopores as nanopower generators
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DOI：
10.1038/nature18593
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发表时间：
2016-08-11
期刊：
影响因子：
64.8
通讯作者：
Radenovic, Aleksandra
中科院分区：
文献类型：
--
作者：
Feng, Jiandong;Graf, Michael;Radenovic, Aleksandra
利用淡水和海水之间的渗透压差是一种有吸引力的，可再生的和清洁的发电方式，被称为“蓝色能源”（1-3）。当电解质被压力梯度（4）或由盐浓度梯度（5）产生的渗透势驱动通过窄孔时，发生另一种电动现象，称为流动电位。对于这项任务，由二维材料制成的膜预计是最有效的，因为水通过膜的传输与膜厚度成反比（5-7）。在这里，我们展示了使用单层二硫化钼（MoS 2）纳米孔作为渗透纳米发电机。我们观察到一个大的，磁感应电流产生的盐梯度与估计的功率密度高达10（6）瓦每平方米的电流，可以主要归因于原子薄膜的二硫化钼2。纳米电子和光电器件的低功率要求可以由邻近的纳米发电机提供，该发电机从局部环境中收集能量（8-11）-例如，压电氧化锌纳米线阵列（8）或单层MoS 2（参考文献12）。我们使用我们的MoS 2纳米孔发生器为MoS 2晶体管供电，从而展示了自供电的纳米系统。
Making use of the osmotic pressure difference between fresh water and seawater is an attractive, renewable and clean way to generate power and is known as 'blue energy'(1-3). Another electrokinetic phenomenon, called the streaming potential, occurs when an electrolyte is driven through narrow pores either by a pressure gradient(4) or by an osmotic potential resulting from a salt concentration gradient(5). For this task, membranes made of two-dimensional materials are expected to be the most efficient, because water transport through a membrane scales inversely with membrane thickness(5-7). Here we demonstrate the use of single-layer molybdenum disulfide (MoS2) nanopores as osmotic nanopower generators. We observe a large, osmotically induced current produced from a salt gradient with an estimated power density of up to 10(6) watts per square metre-a current that can be attributed mainly to the atomically thin membrane of MoS2. Low power requirements for nanoelectronic and optoelectric devices can be provided by a neighbouring nanogenerator that harvests energy from the local environment(8-11)-for example, a piezoelectric zinc oxide nanowire array(8) or single-layer MoS2 (ref. 12). We use our MoS2 nanopore generator to power a MoS2 transistor, thus demonstrating a self-powered nanosystem.