Cu/Fe₃O₄ Nanocomposites from Layered Double Hydroxides as Catalysts for Selective Electroreduction of Carbon Dioxide

Abstract

The reduction of carbon dioxide to valuable chemical products is a hot topic of current research. In this article, Cu nanoparticle-decorated Fe 3 O 4 (Cu/Fe 3 O 4 ) is prepared by using layered double hydroxide (LDH) as the precursor. The CuFe-LDH is synthesized using the coprecipitation method and further reduced to obtain the final material Cu/Fe 3 O 4 . The uniform layered structure of LDH results in highly dispersed metallic elements in the corresponding Cu/Fe 3 O 4 , in which Cu atoms provide Cu 0 and Cu + pairs and good electrical conductivity during the reduction process with Fe 3 O 4 as the framework. Therefore, Cu/Fe 3 O 4 shows high selectivity for CO 2 electroreduction to ethanol, in which the Faraday efficiency is 50.9% at −0.3 V vs RHE. Experimental results show that Cu/Fe 3 O 4 generates uniformly distributed Cu + sites during CO 2 electroreduction, which is conducive to the formation of *CHO, a key intermediate to ethanol. This study provides a design method for catalysts of CO 2 electroreduction with feasibility.

Nitrided copper-iron composite oxides derived from layered double hydroxides for enhanced carbon dioxide electroreduction to methane and formic acid

“…Our group has previously demonstrated that CuFe-LDH could serve as an outstanding precursor for electrochemical catalysts due to its unique properties [47]. In this study, we successfully synthesized amorphous nitrided copper-iron oxides through the gas-phase nitridation of CuFe-LDH, exploiting the distinctive and highly dispersed metal components present in LDH.…”