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首页> 外文期刊>Advanced functional materials >Electrosynthesized CuMgAl Layered Double Hydroxides as New Catalysts for the Electrochemical Reduction of CO_2
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Electrosynthesized CuMgAl Layered Double Hydroxides as New Catalysts for the Electrochemical Reduction of CO_2

机译：Electrosynthesized CuMgAl Layered Double Hydroxides as New Catalysts for the Electrochemical Reduction of CO_2

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In this study, new nanostructured CuMgAl Layered Double Hydroxide (LDH)based materials are synthesized on a 4 cm~2 sized carbonaceous gas diffusionmembrane. By means of microscopic and spectroscopic techniques, the catalystsare thoroughly investigated, revealing the presence of several specieswithin the same material. By a one-step, reproducible potentiodynamic depositionit is possible to obtain a composite with an intimate contact between aternary CuMgAl LDH and Cu0/Cu_2O species. The catalyst compositions areinvestigated by varying: the molar ratio between the total amount of bivalentcations and Al~(3+), the amount of loading, and the molar ratios among thethree cations in the electrolyte. Each electrocatalyst has been evaluated basedon the catalytic performances toward the electrochemical CO_2 reduction toCH3COOH at ?0.4 V versus reversible hydrogen electrode in liquid phase.The optimized catalyst, that is, CuMgAl 2:1:1 LDH exhibits a productivityof 2.0 mmolCH3COOH gcat（?1） h~（?1）. This result shows the beneficial effects ofcombining a material like the LDHs, alkaline in nature, and thus with a greataffinity to CO_2, with Cu~0/Cu~+ species, which couples the increase of carbonsources availability at the electrode with a redox mediator capable to convertCO_2 into a C_2 product.

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