Highly efficient electrochemical reduction of CO₂ to CH₄ in an ionic liquid using a metal–organic framework cathode

Abstract

It has been discovered that Zn metal-organic framework (Zn-MOF) electrodes and ionic liquids are an excellent combination for the efficient and selective reduction of CO2 to CH4.

Nanostructured nonprecious metal catalysts for electrochemical reduction of carbon dioxide

“…It should be noted that the outstanding catalytic activity of partially oxidized 4-atom-thick Co for CO 2 reduction and its synthetic strategy provide new opportunities to tailor the structure and oxidation degree of nanostructured metal catalysts. Among highvalence metal oxides and sulfides, MoO 2 [159] promising catalytic activity, especially in ionic liquid containing electrolytes. Except for metal and metal compounds, non-metal or littlemetal electrocatalysts have demonstrated unique properties for CO 2 reduction.…”

“…Later, Kumar et al demonstrated a Cu 3 (BTC) 2 (BTC = 1,3,5-benzenetricarboxylic acid) MOF film as an efficient electrocatalyst for the selective reduction of carbon dioxide to oxalic acid in N,N-dimethylformamide containing tetrabutylammonium tetrafluoroborate [158]. Recently, Kang et al deposited Zn-BTC MOF on carbon paper as an electrocatalyst for CO 2 reduction with ionic liquids as the electrolytes [159]. The morphology of the Zn-MOF had a significant effect on performance, and the sheet-like Zn-MOF exhibited the highest activity due to its large electroactive surface areas.…”

Metal–organic framework thin films: electrochemical fabrication techniques and corresponding applications & perspectives

“…reduction or charge driving. Thus, this system can be used in metallic oxidation, 23 reductive synthesis, 24 electrophoretic deposition, [62][63][64][65] and two-step synthesis. 66 When electrodes are used to generate metal ions, the anode and cathode electrodes always consist of the same metal.…”

“…Hupp and co-workers developed this idea to deposit electroactive MOF thin films on transparent conductive FTO electrodes using the electrophoretic deposition method. [63][64][65][66] These authors first synthesized four typical MOFs, such as NU-1000, UiO-66, HKUST-1 and MIL-53, which presented some defects resulting in partial negative charges on the MOF surfaces. Then, the MOF particles were deposited on the positively charged electrodes of two identical FTO substrates.…”

“…By applying electrophoretic deposition, Hupp and co-works successfully fabricated layers of NU-1000, Ui-66, HKUST-1 and MIL-53 on the electrode. [63][64][65][66] Surprisingly, MOFs with particle sizes ranging from a few micrometres to several hundreds of nanometres can be deposited on electrodes via the EPD method. Deposition was considered as an essential parameter for preparing MOF thin films.…”