Quantifying electron-transfer in liquid-solid contact electrification and the formation of electric double-layer.,Nature Communications

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Quantifying electron-transfer in liquid-solid contact electrification and the formation of electric double-layer.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-21 , DOI: 10.1038/s41467-019-14278-9
Shiquan Lin _{1,

2} , Liang Xu _{1,

2} , Aurelia Chi Wang ₃ , Zhong Lin Wang _{1,

2,

3}

Affiliation

Contact electrification (CE) has been known for more than 2600 years but the nature of charge carriers and their transfer mechanisms still remain poorly understood, especially for the cases of liquid-solid CE. Here, we study the CE between liquids and solids and investigate the decay of CE charges on the solid surfaces after liquid-solid CE at different thermal conditions. The contribution of electron transfer is distinguished from that of ion transfer on the charged surfaces by using the theory of electron thermionic emission. Our study shows that there are both electron transfer and ion transfer in the liquid-solid CE. We reveal that solutes in the solution, pH value of the solution and the hydrophilicity of the solid affect the ratio of electron transfers to ion transfers. Further, we propose a two-step model of electron or/and ion transfer and demonstrate the formation of electric double-layer in liquid-solid CE.

中文翻译：

量化液-固接触起电中的电子转移和双电层的形成。

接触起电 (CE) 已知已有 2600 多年的历史，但人们对电荷载流子的性质及其转移机制仍然知之甚少，特别是对于液-固 CE 的情况。在这里，我们研究了液体和固体之间的CE，并研究了不同热条件下液-固CE后固体表面CE电荷的衰减。通过使用电子热电子发射理论，将电子转移的贡献与带电表面上的离子转移的贡献区分开来。我们的研究表明，液-固CE中同时存在电子转移和离子转移。我们发现溶液中的溶质、溶液的 pH 值和固体的亲水性会影响电子转移与离子转移的比率。此外，我们提出了电子或/和离子转移的两步模型，并证明了液-固CE中双电层的形成。

更新日期：2020-01-22

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