Gas Diffusion Electrode Systems for the Electro CO2 Conversion

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Gas Diffusion Electrode Systems for the Electro CO2 Conversion ( gas-diffusion-electrode-systems-electro-co2-conversion )

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Catalysts 2021, 11, 482 17 of 19 References calculated from Auger parameter values on the surface of the CuZnAl-oxide based catalysts, Figure S4: Determination of relative roughness (geometric area 0.0706 cm2) of Cu-06 catalyst, Figure S5: LSV responses under CO2 flow of CuZA-06-03-01 catalysts in a Rotating Disk Electrode System. The test was carried out in CO2-purged 0.1 M KHCO3 electrolyte (scan rate: 5 mV s−1) with a catalyst loading of 0.6 mgCuO cm−2, Figure S6: CV responses for a electrode with a ink without catalyst nanoparticles. The VC/Nafion ratio was 70/30, and the test was carried out in 0.1 M KHCO3 aqueous electrolyte, Figure S7: Faradaic efficiencies of gas and liquid products at −1.5 V vs. Ag/AgCl for a electrode with a ink without catalyst nanoparticles. The chronoamperometry was carried out in 0.1 M KHCO3 aqueous electrolyte, Figure S8: Schematic of the control volume, Figure S9: Surface pH trends obtained with the developed model: reproduction of the data reported by Lv et al. and processing of our experimental data (green curve) (obtained with tests conducted on Cu-06 catalyst at −1.5, −1.75 and −2 V vs. Ag/AgCl in 1 M KHCO3 electrolyte solution), Figure S10: Influence of the catalyst thickness on the calculated surface pH for a specific test, conducted on Cu-06 catalysts at −1.5 V vs. Ag/AgCl in 1 M KHCO3 electrolyte solution, Table S1: CO2 reduction products and corresponding standard reduction potential (E0) vs. Normal Hydrogen Electrode (NHE) at pH = 0, Table S2: Main textural parameters of the synthesized CuZnAl-oxide based catalysts, Table S3: Crystallite sizes of the synthesized CuZnAl-oxide based catalysts, Table S4: Capacitance and ECSA values of the electrodes, Table S5: Effective and bulk diffusion coefficients of chemical species in the bulk electrolyte at 25 ◦C, Table S6: Rate constants for forward and reverse reaction at 25 ◦C. Author Contributions: Data curation, Investigation and Writing—original draft, H.G. and F.Z.; Catalysts synthesis, D.R. and H.G.; XRD and ICP analyses, C.G. and H.G.; Methodology, H.G., F.Z. and S.H.; Modelling, F.Z.; Funding acquisition, S.H.; Supervision and Resources, N.R. and S.H.; Writing—review & editing, H.G., F.Z. and S.H. All authors have read and agreed to the published version of the manuscript. Funding: This research was funded by European Union’s Horizon 2020 Research and Innovation Action programme under the SunCoChem project, Grant Agreement No 862192, and the Piedmont Region project Saturno (https://saturnobioeconomia.it (accessed on 6 April 2021)). Acknowledgments: The authors are thankful to Mauro Raimondo and Micaela Castellino for the technical support in the acquisition of FESEM images and XPS data, respectively. Conflicts of Interest: The authors declare no conflict of interest. 1. Guzmán, H.; Salomone, F.; Batuecas, E.; Tommasi, T.; Russo, N.; Bensaid, S.; Hernández, S. How to make sustainable CO2 conversion to Methanol: Thermocatalytic versus electrocatalytic technology. Chem. Eng. J. 2020, 127973. [CrossRef] 2. Jouny, M.; Luc, W.W.; Jiao, F. General Techno-Economic Analysis of CO2 Electrolysis Systems. Ind. Eng. Chem. Res. 2018, 57, 2165–2177. [CrossRef] 3. Vennekoetter, J.-B.; Sengpiel, R.; Wessling, M. Beyond the catalyst: How electrode and reactor design determine the product spectrum during electrochemical CO2 reduction. Chem. Eng. J. 2019, 364, 89–101. [CrossRef] 4. Endro ̋di, B.; Bencsik, G.; Darvas, F.; Jones, R.; Rajeshwar, K.; Janáky, C. Continuous-flow electroreduction of carbon dioxide. Prog. Energy Combust. Sci. 2017, 62, 133–154. [CrossRef] 5. Burdyny, T.; Smith, W.A. CO2 reduction on gas-diffusion electrodes and why catalytic performance must be assessed at commercially-relevant conditions. Energy Environ. Sci. 2019, 12, 1442–1453. [CrossRef] 6. Sacco, A.; Zeng, J.; Bejtka, K.; Chiodoni, A. Modeling of gas bubble-induced mass transport in the electrochemical reduction of carbon dioxide on nanostructured electrodes. J. Catal. 2019, 372, 39–48. [CrossRef] 7. Raciti, D.; Mao, M.; Wang, C. Mass transport modelling for the electroreduction of CO2 on Cu nanowires. Nanotechnology 2017, 29, 044001. [CrossRef] [PubMed] 8. Singh, M.R.; Clark, E.L.; Bell, A.T. Effects of electrolyte, catalyst, and membrane composition and operating conditions on the performance of solar-driven electrochemical reduction of carbon dioxide. Phys. Chem. Chem. Phys. 2015, 17, 18924–18936. [CrossRef] [PubMed] 9. Schouten, K.J.P.; Gallent, E.P.; Koper, M.T. The influence of pH on the reduction of CO and CO2 to hydrocarbons on copper electrodes. J. Electroanal. Chem. 2014, 716, 53–57. [CrossRef] 10. Ooka, H.; Figueiredo, M.C.; Koper, M.T.M. Competition between Hydrogen Evolution and Carbon Dioxide Reduction on Copper Electrodes in Mildly Acidic Media. Langmuir 2017, 33, 9307–9313. [CrossRef] 11. Guzmán, H.; Russo, N.; Hernández, S. CO2 valorisation towards alcohols by Cu-based electrocatalysts: Challenges and perspectives. Green Chem. 2021, 23, 1896–1920. [CrossRef]

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