Synthesis of graphene-cobalt phthalocyanine (CoPc) geopolymer-based electrode for electrochemical CO2 reduction reaction (ECO2RR) to CO

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ID: 284886
2024
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Abstract
Geopolymers have become an emerging substrate for electrochemical applications due to their good adsorption capacity, promising chemical stability, and inherent ionic conductivity attributed to the presence of alkali pore solutions. In addition, its electrical conductivity can be further developed by introducing carbon fillers such as Graphene, which will create a conductive network within the matrix. Among possible electrochemical applications, Electrochemical Carbon dioxide Reduction Reaction (ECO2RR) to Carbon monoxide has earned vast attention from the scientific community recently as carbon monoxide can be used directly as a feedstock for fuel production while having carbon dioxide as its waste product, thus forming a sustainable carbon circular economy. However, this pathway requires an efficient electrocatalyst with high selectivity, promising electrochemical activity, and excellent stability while maintaining the economic balance between its price and the cost of its main reaction product. In this study, CoPc is anchored in Graphene’s surface, creating the Graphene-Cobalt Phthalocyanine (CoPc), which is incorporated into Perlite-Metakaolin-based geopolymer to improve the latter’s electrical conductivity and electrochemical activity. The geopolymer matrix acted as a conductive carrier with good CO2 adsorption capacity to fabricate a relatively low-cost working electrode suitable for ECO2RR to CO. The effect of precursor composition, activator-to-precursor ratio, curing temperature, and Graphene loading introduced to the electrical conductivity of the geopolymer is investigated. Furthermore, the electrochemical performance of the fabricated Geopolymer Graphene-CoPc composite is also evaluated relative to pure Graphene-CoPc and CoPc. Results show that when it comes to gas production, pure Graphene-CoPc yields 4.7% higher CO production than geopolymer graphene-CoPc; however, the former exhibits higher total charge, resulting in lower Faradaic efficiency (FE). On the other hand, the (FE) CO of Geopolymer Graphene-CoPc reached 96.26%, outranking Graphene-CoPc and pristine CoPc with an FE (CO) of 69.88% and 72.42%, respectively.
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Authors Promentilla, Michael Angelo Baliwag
Journal Malay Journal
Year 2024
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etdm_chemeng/21
Keywords Keywords not found

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