# CO2 Electroreduction efficiency of various Cu based layered double hydroxides

Vanessa Prevot, Ali Tarhini, Mélanie Guyot, Cyrille Costentin, Chardon-Noblat Sylvie, Mousty Christine

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Vanessa Prevot, Ali Tarhini, Mélanie Guyot, Cyrille Costentin, Chardon-Noblat Sylvie, et al. CO2 Electroreduction efficiency of various Cu based layered double hydroxides. Euroclay, Jul 2023, Bari, Italy. hal-04687953

HAL Id: hal-04687953

https://hal.science/hal-04687953v1

Submitted on 10 Sep 2024

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CO₂ Electroreduction efficiency of various Cu based layered double hydroxides.

TARHINI Ali(a), GUYOT Mélanie(b), COSTENTIN Cyrille(b), CHARDON-NOBLAT Sylvie(b), MOUSTY Christine(a), PREVOT Vanessa(a)*

a) Institut de Chimie de Clermont-Ferrand, Clermont-Ferrand (France)

(b) Département de Chimie Moléculaire, Grenoble (France)

*vanessa.prevot@uca.fr

The emission of CO₂ by industrial action seriously impacts our environment which requires us to consider strategies to reduce the emitted CO₂ to the atmosphere. The electrochemical reduction of CO₂ (CO₂ER) into molecules such as CO, HCOOH, CH₃COOH, and CH₄ is one of the many ways to valorize CO₂ as fuels or chemicals¹. Not only could this help reduce pollution, but it would also convert the CO₂ into valuable products to use as a feedstock. Amongst the different heterogeneous catalysts investigated, Cu based electro-catalysts for CO₂ER Cu electrodes have attracted much attention due to their unique advantages including hydrocarbon production and product selectivity.²

Recently, Cu-based LDH ([M(II)₁-xAl(III)x(OH)₂]x⁺[Aⁿ⁻]x/n·yH₂O, 0.20 ≤ x ≤ 0.33), with M(II) = Cu and M(III) = Al have particularly been investigated for CO₂ER. These matrices appear as promising electrocatalyst promoting the electrochemical conversion, in galvanostatic conditions, of CO₂ to CO and HCOOH ³. A morphology control allowed to improve the catalytic activity by tailoring the structure of active sites and increasing the surface area/number of active sites.⁴

Herein, the electrochemical efficiencies towards CO₂ER of a series of CuAl-LDH matrices were compared. The LDH materials were synthesized by both the coprecipitation and the polyol method and characterized using powder X-ray diffraction (PXRD), Infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Electrochemical characterization of the Cu-LDH modified electrodes was carried out following a specific protocol by linear sweep voltammetry and cyclic voltammetry showing that an electrochemical activation of the Cu-LDH occurred at Eapp >-1.4 V, leading to an enhancement of the electrochemical signal of the copper redox couples, addressing to more accessible catalytic sites and to an increase in current under CO₂ and hence CO₂ activation. The influence of the LDH composition that is the Cu amount into the layer, the presence of Mg or Zn in a ternary layer composition, and the nature of the interlayer anions were investigated showing that the composition Cu₁.₅ Mg₀.₅Al-CO₃ provides the highest faradaic yield of HCOOH formation, reaching 57%.

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2. Zhao, J.; Xue, S.; Barber, J.; Zhou, Y.; Meng, J.; Ke, X. An overview of Cu-based heterogeneous electrocatalysts for CO₂ reduction. *Journal of Materials Chemistry A* 2020, *8* (9), 4700

3. Altaf, N.; Liang, S.; Huang, L.; Wang, Q. Electro-derived Cu-Cu₂O nanocluster from LDH for stable and selective C2 hydrocarbons production from CO₂ electrochemical reduction. *Journal of Energy Chemistry* 2020, *48*, 169.

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