Efficient Electrocatalytic Reduction of Carbon Dioxide in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate and Water Mixtures,Energy & Fuels

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Efficient Electrocatalytic Reduction of Carbon Dioxide in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate and Water Mixtures
Energy & Fuels ( IF 5.2 ) Pub Date : 2018-10-19 00:00:00 , DOI: 10.1021/acs.energyfuels.8b02750
Amanuel Hailu ₁ , Scott K. Shaw ₁

Affiliation

The catalytic activity of room-temperature ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]) for carbon dioxide (CO₂) reduction is reported on a polycrystalline silver electrode as a function of the water content and solution pH. The optimal aqueous dilution was determined to be ca. 10% (v/v), resulting in a reduction of the overpotential required to reduce CO₂ in [EMIM][OTf] by 400 mV. The reduction process and products are largely insensitive to pH. CO₂ reduction in [EMIM][OTf] with 10% 0.1 M NaHCO₃ is achieved with high selectivity for CO with 93.0 ± 4.6% Faradaic efficiency. Hydrogen evolution reaction (HER) is suppressed in the range of neat [EMIM][OTf] (500 ppm water content) to a [EMIM][OTf]/H₂O mixture of 10% water content. Conductivity and viscosity of the [EMIM][OTf]/H₂O mixture suggest that the ionic liquid ion pair fully dissociates, analogous to dilute KCl solution, where each ion is completely hydrated by water molecules.

中文翻译：

1-乙基-3-甲基咪唑三氟甲烷磺酸盐和水混合物中二氧化碳的高效电催化还原

在多晶硅电极上报道了室温离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐（[EMIM] [OTf]）对二氧化碳（CO ₂）还原的催化活性，它是水含量和溶液pH的函数。确定最佳的水稀释度为约。10％（v / v），导致将[EMIM] [OTf]中的CO ₂减少400 mV所需的过电势降低。还原过程和产物对pH值不敏感。用10％0.1 M NaHCO ₃降低[EMIM] [OTf]中的CO ₂，对法拉第效率达93.0±4.6％的CO具有高选择性。在纯EMI [EMIM] [OTf]（水含量为500 ppm）至[EMIM] [OTf] / H的范围内，析氢反应（HER）被抑制含水量为10％的₂ O混合物。[EMIM] [OTf] / H ₂ O混合物的电导率和粘度表明，离子液体离子对完全解离，类似于稀KCl溶液，其中每个离子都被水分子完全水合。

更新日期：2018-10-19

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