Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy,ChemPlusChem

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Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy
ChemPlusChem ( IF 3.0 ) Pub Date : 2020-11-17 , DOI: 10.1002/cplu.202000600
Keith Chin ₁ , Jasmina Pasalic ₁ , Ninos Hermis ₁ , Laura M. Barge ₁

Affiliation

In an early earth or planetary chimney systems, hydrothermal fluid chemistry and flow durations play a large role in the chimney's ability to drive electrochemical reactions for the origin of life. We performed continuous electrochemical impedance spectroscopy (EIS) characterization on inorganic membranes representing prebiotic hydrothermal chimney vents in natural seafloor systems, by incorporating an electrode array into a chimney growth experiment. Localized potential and capacitances profiles in the chimney reveal a dynamic system where redox processes are driven by transport phenomena, increasing rapidly due to disequilibrium until achieving equilibrium at about 100 mV and 1000 μF/cm². The impedance in the chimney interior is three orders of magnitude lower (100 Ohms/cm² vs 100 KOhms/cm²) than at the ocean or the ocean/chimney interface. The calculated peak dissipation factor (DF) values are more than ten times higher (40.0 vs 3.0) and also confirm the elevated chemical reactivity in the chimney interior.

中文翻译：

化学园作为电化学系统：通过阻抗谱法对模拟益生元热液通风口进行现场表征

在早期的地球或行星状烟囱系统中，热液流体的化学性质和流动持续时间在烟囱驱动电化学反应以促进生命起源的能力中起着重要作用。我们通过将电极阵列纳入烟囱生长实验，对代表天然海底系统中益生元热液烟囱通风口的无机膜进行了连续电化学阻抗谱（EIS）表征。烟囱中的局部电势和电容分布揭示了一个动态系统，其中氧化还原过程受传输现象驱动，由于不平衡而迅速增加，直到达到约100 mV和1000 µF / cm2的平衡。烟囱内部的阻抗比海洋或海洋/烟囱界面的阻抗低三个数量级（100 Ohms / cm2对100.0 KOhms / cm2）。

更新日期：2020-12-04

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