Electrochemical insights into layered La2CuO4 perovskite: Active ionic copper for selective CO2 electroreduction at low overpotential

Singh, Rana Pratap and Arora, Payal and Nellaiappan, Subramanian and Shivakumara, C and Irusta, Silvia and Paliwal, Manas and Sharma, Sudhanshu (2019) Electrochemical insights into layered La2CuO4 perovskite: Active ionic copper for selective CO2 electroreduction at low overpotential. In: ELECTROCHIMICA ACTA, 326 .

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Abstract

La2CuO4, a layered perovskites oxide was synthesized using solution combustion method at different calcination temperatures. XRD characterization and Rietveld refinement analysis confirms the pure phase of the synthesized material. The effect of calcination causes shrinking in the lattice parameters affirm the change in the oxygen stoichiometry. Four Probe (Van der Pauw's) and CP-AFM analysis were carried out to understand the influences of calcination temperature on electrical conductivity. Electrochemical investigations on La2CuO4 were performed at various negative potential ranges using cyclic voltammetry (CV) to identify the redox active centre. Thermodynamic calculations are further carried out to validate the electrochemical results in different mediums. Selective electrocatalytic conversion of CO2 to C-2-hydrocarbon (C2H4) with FE% of 40.3% which is 10 times higher than CH4 (FE% = 4.1%) emphasized the in-situ formation of Cu2O from the redox active centre present in La2CuO4. Hydrocarbons are generated at a very low overvoltage (-0.4 V RHE) in comparison to literature. XPS analysis indeed confirms the presence of Cu+ species i.e., in-situ generated Cu2O, on La2CuO4 after CV and CO2 electrocatalysis.

Item Type:	Journal Article
Publication:	ELECTROCHIMICA ACTA
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright of this article belongs to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	La2CuO4; Redox active centre; Thermodynamics; CO2 electroreduction; C-2-hydrocarbon formation
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	11 Dec 2019 10:30
Last Modified:	11 Dec 2019 10:30
URI:	http://eprints.iisc.ac.in/id/eprint/63882

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