Generalized dynamic junction theory to resolve the mechanism of direct current generation in liquid-solid interfaces
Generalized dynamic junction theory to resolve the mechanism of direct current generation in liquid-solid interfaces
复制标题
广义动态结理论解决液固界面直流电产生机制
DOI：
10.1016/j.nanoen.2022.107364
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发表时间：
2022
期刊：
影响因子：
17.6
通讯作者：
Liu, Zhaoping
中科院分区：
文献类型：
--
作者：
Solares-Bockmon, Cristal;Lim, Aniqa Ibnat;Mohebinia, Mohammadjavad;Xing, Xinxin;Tong, Tian;Li, Xingpeng;Baldelli, Steven;Lee, T.R.;Wang, Wei;Liu, Zhaoping
尽管从表面上的液体的连续流动发电的不稳定的机制，充电-放电理论已被广泛接受的交流（AC）发电从一个移动的液滴。它最近已被扩展到合理的直流（DC）发电跨越两种不同的材料之间移动的液滴。通过设计一个可重构的金属线和一个水滴之间的接触石墨烯移动，我们表明，充放电理论不能解释的电流反转时，水-金属界面从动态切换到静态。所有的实验都可以在我们区分动态和静态界面并将类似光致发光的效应推广到所有动态结之后进行描述：在移动界面中的激发电子和空穴将在内置电场下分离和扫描，导致DC响应。这一广义理论将导致理解和设计的有效发电的基础上界面电荷转移。
Despite the unsettled mechanism of electricity generation from the continuous flow of liquids on a surface, the charge-discharge theory has been widely accepted for alternating current (AC) generation from a moving droplet. It has been recently extended to rationalize direct current (DC) generation across a droplet moving between two different materials. By designing a reconfigurable contact between a metal wire and a water droplet moving on graphene, we show that the charge-discharge theory cannot explain the reversal of current when water-metal interfaces switch from dynamic to static. All experiments can be described after we distinguish a dynamic from a static interface and generalize the photovoltaic-like effect to all dynamic junctions: excited electrons and holes in a moving interface will be separated and swept under the built-in electrical field, leading to a DC response. This generalized theory will lead to an understanding and the design of efficient electricity generation based on interfacial charge transfer.