Hybridized Fe/Ru-SiMWCNT-ionic liquid nanofluid for CO2 conversion into carbamate using superoxide ion

Halilu, Ahmed and Hayyan, Maan and Aroua, Mohamed Kheireddine and Yusoff, Rozita and Hizaddin, Hanee F. and Basirun, Wan Jefrey (2021) Hybridized Fe/Ru-SiMWCNT-ionic liquid nanofluid for CO2 conversion into carbamate using superoxide ion. Journal of Environmental Chemical Engineering, 9 (4). ISSN 2213-2929, DOI https://doi.org/10.1016/j.jece.2021.105285.

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Suppressing the nucleophilic susceptibility of ionic liquids based nanofluid is necessary for energy storage and superoxide ion (O-2(center dot-)) utilization. This study reports the development of novel pseudocapacitive Fe/Ru-SiMWCNT nanofluid comprising of Fe3O4, RuO2, SiO2, and MWCNT hybridized phases. The Fe/Ru-SiMWCNT nanohybrid possessed CO2 and O-2 sorption capability, as confirmed from the temperature-programmed desorption experiments. Detailed spectroscopy techniques characterize the Fe/Ru-SiMWCNT nanohybrid component's physicochemical and morphological properties. The novel ionic liquid (IL) based nanofluid index is Fe/Ru-SiMWCNT/1(2-methoxyethyl)-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate. Therefore, stable O-2(center dot-) was generated therein at 0.445 V vs Ag/AgCl and recorded long-term stability for 2 days with 87.31 % efficiency. Moreover, the O-2(center dot-) mediated CO2 conversion to C2O62- at 0.54 V vs Ag/AgCl with 97.90 % energy efficiency. Also, the normalized exchange current density in the nanofluid was 2.20 mA/cm(2), which is higher than 1.94 mA/cm(2) observed in the IL counterpart. The high normalized exchange current density is due to Fe/Ru-SiMWCNT nanohybrid phase's pseudocapacitance. Accordingly, this pseudocapacitive capability enables converting O-2 and CO2 in the nanofluid with lower activation overpotential of 0.305 and 0.460 V vs Ag/AgCl, respectively. In contrast, the conversion of O-2 and CO2 in the IL required higher activation overpotential of -0.826 and -1.013 V vs Ag/AgCl, respectively. The electrolysis of O-2/CO2 in the nanofluid containing diethanolamine at 1.564 V vs Ag/AgCl, 60 degrees C and 1.0 h produced methyl 2-hydroxyethyl (methyl) carbamate as the primary product. The heteronuclear multiple bond correlation spectroscopy analysis finally elucidated the carbamate structure by two strong correlations between the protons and carbons in the vicinity of three and four bonds apart. Therefore, this study highlights the control design of electrochemically stable IL-based nanofluids robust for reactive oxygen species, energy storage and conversion.

Item Type: Article
Funders: Newton Fund Institutional Links Project [IF013-2015], RU Grant [GPF058A-2020]
Uncontrolled Keywords: Electrocatalysis; CO2 capture; CO2 utilization; Reactive oxygen species; Nanotechnology; Multi-walled carbon nanotube; Pseudocapacitance
Subjects: Q Science > QD Chemistry
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 29 Jul 2022 14:51
Last Modified: 29 Jul 2022 14:51
URI: http://eprints.um.edu.my/id/eprint/28295

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