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Insight on Zn-Al LDH as electrocatalyst for CO2 reduction reaction: An in-situ ATR-IR study

Articolo
Data di Pubblicazione:
2024
Abstract:
Electrochemical reduction of CO 2 (CO2RR) is expected to play a key role among the various strategies being explored to limit global warming. In this scenario, Layered Double Hydroxides (LDHs) are emerging as a promising class of electrocatalysts to replace the most used noble metals. In this work three Zn-Al LDH with different Zn 2+ /Al 3+ ratio were synthesized and characterized by means of XRD, STEM-EDX and HR-TEM. Their suitability for CO2RR to CO was assessed by means of a custom-made three -compartment cell, showing an increase in CO selectivity by decreasing the Zn 2+ /Al 3+ ratio. The CO 2 interaction with the samples was firstly characterized by means of volumetric adsorption measurements, exhibiting an increase in capture capacity by decreasing the Zn 2+ /Al 3+ ratio. The evolution of the samples in interaction with a CO 2 -saturated liquid flow was then deeply investigated by means of in -situ ATR-IR spectroscopy. The samples displayed a different evolution in the vibrational region of the carbonate -like species (1800 - 1200 cm -1 ). To better discriminate the different carbonate cyclohexane was also employed. A definitive assignment of the main IR bands of the carbonate was carried out by studying the spectral behavior of the different bands observed in the ATR-IR experiments and by comparing these results with the existing literature. Interestingly, Zn-Al 1:2 LDH, the most efficient electrocatalyst for CO2RR, is also the sole sample exhibiting a higher monodentate to total bidentate carbonates ratio, suggesting that the existence of a higher content of low coordination oxygen anions with stronger basic character can influence the final catalytic activity.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
In -situ ATR-IR spectroscopy; Layered Double Hydroxide; CO 2 reduction reaction; Electrocatalysis
Elenco autori:
Cavallo, Margherita; Dosa, Melodj; Nakazato, Ryosuke; Porcaro, Natale Gabriele; Signorile, Matteo; Quintelier, Matthias; Hadermann, Joke; Bordiga, Silvia; Rosero-Navarro, Nataly Carolina; Tadanaga, Kiyoharu; CrocellĂ , Valentina; Bonino, Francesca
Autori di Ateneo:
BONINO Francesca Carla
BORDIGA Silvia
CROCELLA' Valentina
PORCARO Natale Gabriele
SIGNORILE Matteo
Link alla scheda completa:
https://iris.unito.it/handle/2318/2028600
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/2028600/1405779/Cavallo_JCO2Util_2024.pdf
Pubblicato in:
JOURNAL OF CO2 UTILIZATION
Journal
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Settori (4)


PE5_1 - Structural properties of materials - (2024)

PIANETA TERRA, AMBIENTE, CLIMA, ENERGIA e SOSTENIBILITA' - Chimica e Ambiente

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Chimica Organica e Industriale

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Materiali Avanzati
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