Mechanistic Investigation of Electrostatic Field-Enhanced Water Evaporation,Advanced Science

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Mechanistic Investigation of Electrostatic Field-Enhanced Water Evaporation
Advanced Science ( IF 14.3 ) Pub Date : 2021-07-26 , DOI: 10.1002/advs.202100875
Jipeng Fei ₁ , Bin Ding _{2,

3} , See Wee Koh ₁ , Junyu Ge ₁ , Xingli Wang ₄ , Liquan Lee ₁ , Zixu Sun ₁ , Mengqi Yao ₁ , Yonghao Chen ₅ , Huajian Gao _{1,

3} , Hong Li _{1,

4,

6}

Affiliation

Investigations on external electrostatic field (EEF)-enhanced liquid water evaporation have been reported decades ago, which suggest that molecular alignment and polarization tuned by EEF accelerating the phase change process could be responsible for EEF-enhanced water evaporation. However, a detailed study revealing the role of EEF in altering the intermolecular and intramolecular water structure is lacking. Herein, an EEF is proved to tune water state by accelerating the thermal movement of water molecules, lowering the molecular escaping energy, and loosening the hydrogen bond structure. The detailed mechanisms and field interactions (heat and electrostatic) are investigated by in situ Raman characterizations and molecular dynamic simulations, which reveal that an EEF can effectively reduce the free energy barrier of water evaporation and then increase the evaporated water molecule flux. As a proof of concept, an EEF is integrated into an interfacial two-dimentional solar steam generator, enhancing the efficiency by up to 15.6%. Similar to a catalyst lowing activation energy and enhancing kinetics of a chemical reaction, the EEF enhances water state tuning, lowers evaporation enthalpy, and then boosts steam generation rate with negligible additional energy consumption, which can serve as a generic method for water evaporation enhancement in water harvesting, purification, and beyond.

中文翻译：

静电场增强水蒸发的机理研究

关于外部静电场 (EEF) 增强液态水蒸发的研究在几十年前就已被报道，这表明 EEF 加速相变过程调节的分子排列和极化可能是 EEF 增强水蒸发的原因。然而，缺乏揭示 EEF 在改变分子间和分子内水结构中的作用的详细研究。在此，EEF被证明可以通过加速水分子的热运动、降低分子逃逸能和松开氢键结构来调节水状态。通过原位拉曼表征和分子动力学模拟研究了详细的机制和场相互作用（热和静电），结果表明EEF可以有效降低水蒸发的自由能垒，从而增加蒸发的水分子通量。作为概念验证，EEF 集成到界面二维太阳能蒸汽发生器中，效率提高高达 15.6%。与降低活化能和增强化学反应动力学的催化剂类似，EEF增强了水态调节，降低了蒸发焓，然后以可忽略不计的额外能耗提高了蒸汽生成速率，这可以作为增强水蒸发的通用方法。集水、净化等。

更新日期：2021-09-22

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