CO₂capture and electrochemical conversion using superbasic [P₆₆₆₁₄][124Triz]

Abstract

The ionic liquid trihexyltetradecylphosphonium 1,2,4-triazolide, [P66614][124Triz], has been shown to chemisorb CO2 through equimolar binding of the carbon dioxide with the 1,2,4-triazolide anion. This leads to a possible new, low energy pathway for the electrochemical reduction of carbon dioxide to formate and syngas at low overpotentials, utilizing this reactive ionic liquid media. Herein, an electrochemical investigation of water and carbon dioxide addition to the [P66614][124Triz] on gold and platinum working electrodes is reported. Electrolysis measurements have been performed using CO2 saturated [P66614][124Triz] based solutions at −0.9 V and −1.9 V on gold and platinum electrodes. The effects of the electrode material on the formation of formate and syngas using these solutions are presented and discussed.

Electrochemical carbon dioxide capture to close the carbon cycle

“…Examples of electrochemical hybrid capture and utilization is the electrochemical seawater battery system [176], the alkali metal-based CO 2 batteries (e.g., lithium-CO 2 batteries [177,178]) and electrochemical CO 2 capture and conversion combinations [25,[179][180][181][182][183]. The absence of pH-swings, and the lack of further development of these proposed electrochemical capture routes, categorizes these concepts beyond the scope of this review.…”

On the application of Ti/TiO 2 /CuO n-p junction semiconductor: A case study of electrolyte, temperature and potential influence on CO 2 reduction

“…(4)) deemed indispensable for the new products formation (Eqs. 7, (8) and (9)). This mechanism ensures a high stability for the TiO 2 /CuO semiconductor and is represented in Fig.…”

“…The current appalling growing concern for CO 2 levels on the planet has widely contributed to fueling a greater demand for methods capable of promoting the reuse of CO 2 mainly through its conversion into products with high added value [1]. The literature has reported several methods proposed with this objective in mind among them including biocatalysis [2,3], thermocatalysis [4,5], photocatalysis [6,7], electrocatalysis [8,9] and photoelectrocatalysis [10,11]. The methods based on artificial photosynthesis such as photocatalysis have attracted a wider interest as an approach for the conversion of CO 2 using solar energy into useful fuels including methane, methanol, carbon monoxide, formic acid and formaldehyde [1,6,12,13].…”

The life-cycle environmental performance of producing formate via electrochemical reduction of CO2 in ionic liquid

“…In this article, we focus on an electrochemical reduction process that uses a novel ILtrihexyltetradecylphosphonium 1,2,4-triazolide ([P66614][124Triz]) -for the production of formate, the anionic form of formic acid. [P66614][124Triz] is a super-basic room temperature IL that can chemisorb CO 2 in nearly equimolar quantities and that requires low overpotentials to reduce CO 2 compared to other ILs 15,16 . Formate can in turn be easily converted into formic acid, a widely used chemical in numerous applications such as de-icing (as salt of formic acid), cleaning (descaling and cleaning bathroom surfaces and toilet), pH regulator (in the bleaching operations of the textile industry and in the dyeing and tanning of the leather sector) 17 .…”