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Graphene-Piezoelectric Material Heterostructure for Harvesting Energy from Water Flow

机译：用于从水流中收集能量的石墨烯-压电材料异质结构

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摘要

Recently, liquid flow over monolayer graphene has been experimentally demonstrated to generate an induced voltage in the flow direction, and various physical mechanisms have been proposed to explain the electricity-generating process between liquid and graphene. However, there are significant discrepancies in the reported results with non-ionic liquid: the observed voltage responses with deionized (DI) water vary from lab to lab under presumably similar flowing conditions. Here, a graphene-piezoelectric material heterostructure is proposed for harvesting energy from water flow; it is shown that the introduction of a piezoelectric template beneath graphene results in an obvious voltage output up to 0.1 V even with DI water. This potential arises from a continuous charging-discharging process in graphene, which is suggested to be a result of a relatively retarded screening effect of the water for the generated piezoelectric charges than that of the graphene layer, as revealed by first-principles calculations. This work considers a dynamic charge interaction among water, graphene, and the substrate, highlighting the crucial role of the underlying substrate in the electricity-generating process, which will greatly enhance understanding of the flow-induced voltage and push the graphene-water nanogenerator close to practical applications.
机译：近来，已经通过实验证明了在单层石墨烯上的液体流动在流动方向上产生感应电压，并且已经提出了各种物理机理来解释液体和石墨烯之间的发电过程。但是，非离子液体的报告结果存在显着差异：在假定相似的流动条件下，实验室中去离子（DI）水的观察到的电压响应各不相同。在此，提出了一种石墨烯-压电材料异质结构，用于从水流中收集能量。结果表明，即使使用去离子水，在石墨烯下方引入压电模板也会导致明显的电压输出，最高可达0.1V。该电位来自石墨烯中的连续充放电过程，这被认为是水对生成的压电电荷的屏蔽作用比石墨烯层相对较慢的结果，如第一性原理计算所示。这项工作考虑了水，石墨烯和基质之间的动态电荷相互作用，突出了下层基质在发电过程中的关键作用，这将大大增强对流感应电压的理解，并推动石墨烯-水纳米发生器的发展。到实际应用。

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  • 来源
    《Advanced Functional Materials》 |2017年第5期|1604226.1-1604226.7|共7页
  • 作者

    Zhong Huikai; Xia Jun; Wang Fengchao; Chen Hongsheng; Wu Hengan; Lin Shisheng;

  • 作者单位

    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China|Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China;

    Univ Sci & Technol China, CAS Ctr Excellence Nanosci, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China;

    Univ Sci & Technol China, CAS Ctr Excellence Nanosci, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China;

    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China|Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China;

    Univ Sci & Technol China, CAS Ctr Excellence Nanosci, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China;

    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China|Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China;

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