A diethyl methyl ammonium triflate based protic ionic liquid polymer membrane for intermediate temperature water electrolysis
A diethyl methyl ammonium triflate based protic ionic liquid polymer membrane for intermediate temperature water electrolysis
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DOI：
10.1016/j.ijhydene.2020.08.016
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发表时间：
2020-10
影响因子：
7.2
通讯作者：
Ravikumar Thimmappa;K. Scott;M. Mamlouk
中科院分区：
文献类型：
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作者：
Ravikumar Thimmappa;K. Scott;M. Mamlouk
三氟甲磺酸二乙基甲基铵[Dema][TfO]，一种质子离子液体，被用作中温水电解槽的电解质。在这项研究中，我们制作了聚合物电解质膜的基础上，PTFE孔填充膜浸渍[德马][TfO]。离子电导率的活化能为8.12 kJ mol−1。采用原位RHE参比电极，分别以Pt/C为阴极和IrO 2为阳极，研究了固态电池中的析氢反应（HER）和析氧反应（OER）。在两个不同的电位下观察到HER，一个在相对于RHE的-0.47 V的峰值电位下，极限电流密度为-9.7 mA/cm 2，归因于水合氢离子的还原。第二个HER在−0.63 V vs. RHE下观察到，归因于[Dema-H]+阳离子还原。类似地，两个氧化峰归属于OER，一个在1.47 V处，第二个在1.72 V处（相对于RHE）。全电池水电解槽在2.2V和50%RH下在100 °C下实现了70 mA/cm 2的电流密度。用原位质谱法研究了[Dema-H]+[TfO]-的稳定性，其显示DEMA在> −0.8 V（相对于RHE）时损失，而[TfO]-阴离子在高达2.5 V（相对于RHE）时稳定。
Diethylmethylammonium trifluoromethanesulfonate [Dema][TfO], a protic ionic liquid, was used as an electrolyte for an intermediate temperature water electrolyser. In this study we fabricated polymer electrolyte membrane based on PTFE pore filled membrane impregnated with [Dema][TfO]. The activation energy obtained for an ionic conductivity was 8.12 kJ mol−1. Hydrogen evolution reaction (HER) and oxygen evolution reactions (OER) were studied in the solid-state cell with an in-situ RHE reference electrode, using Pt/C cathode and IrO2anode respectively. The HER was observed at two different potentials, one at a peak potential of −0.47 V vs RHE with a limiting current density of −9.7 mA/cm2, assigned to reduction of hydronium ion. The second HER was observed at −0.63 V vs. RHE, assigned to the [Dema-H]+cation reduction. Similarly, two oxidation peaks were assigned to OER one at 1.47 V and the second at 1.72 V vs RHE. The full cell water electrolyser achieved a current density of 70 mA/cm2at 2.2 V with 50% RH at 100 °C. The stability of [Dema-H]+[TfO]-was studied with in-situ mass spectrometry which showed the loss of DEMA at > −0.8 V vs RHE while [TfO]-anion was stable up to 2.5 V vs RHE.