Integrated capture and electroreduction of low-concentration CO 2 to CO using geopolymer|graphene-cobalt phthalocyanine composite Eunice Estrella De Guzman a , Tzu-Hsuan Wang a , Michael Angelo Promentilla b * and Chia-Yu Lin a,c,d* a Department of Chemical Engineering, National Cheng Kung University, Tainan City 70101, Taiwan, b Department of Chemical Engineering, De La Salle University – 2401 Taft Avenue, Manila, 022, Philippines, c Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, Tainan 70101, Taiwan, d Program on Key Materials & Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan 70101, Taiwan Green electricity-driven electrocatalytic CO 2 reduction (e-CO 2 RR) has emerged as a promising approach to upcycle CO 2 into valuable chemicals and fuels, paving the way for a carbon-neutral economy. The success of such a device relies on the development of cost-effective catalysts that can efficiently and selectively catalyzee- CO 2 RR. In the present contribution, the high activity and selectivity of graphene-supported CoPc (graphene- CoPc) are demonstrated toward CO generation frome-CO 2 RR by encapsulating graphene|CoPc into Perlite– Metakaolin-based geopolymer (geopolymer|graphene-CoPc). The high electric conductivity (3.52 ± 0.4 S m −1 ) and CO 2 adsorption capability (0.16 mmol CO 2 g −1 ) of the geopolymer matrix, obtained through the systematic investigation and optimization of synthetic conditions, facilitate the charge transfer and provide high local CO 2 concentration. Consequently, this significantly enhancing both turnover frequency (2.3 ± 0.3 s −1 ) and Faradaic efficiency (93.7 ± 3.1%) of geopolymer|graphene-CoPc for CO production from the low-concentration CO 2 (≈40%) in simulated biogas atmosphere at a low η of 0.69 V as compared to the pristine graphene-CoPc (turnover frequency: 1.37 ± 0.1 s −1 and Faradic efficiency: 46.3 ± 2.0%). References 1. De Guzman, E.E., Wang, T.-H., Promentilla, M.A.B. and Lin, C.-Y. (2025), Integrated Capture and Electroreduction of Low- Concentration CO 2 to CO Using Geopolymer|Graphene-Cobalt Phthalocyanine Composite. Adv. Energy Sustainability Res. 2500080.https://doi.org/10.1002/aesr.202500080
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