Biochar/Zinc Oxide Composites as Effective Catalysts for Electrochemical CO2 Reduction
| Autor: | Juqin Zeng, Mirtha A.O. Lourenço, Pravin Vitthal Jagdale, Adriano Sacco, Candido Pirri, M. Amin Farkhondehfal, Micaela Castellino |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry Electrocatalyst Electrochemistry 01 natural sciences carbon monoxide law.invention law Biochar Environmental Chemistry electrocatalysis biochar Electrolysis Renewable Energy Sustainability and the Environment carbon dioxide zinc oxide General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry Reversible hydrogen electrode 0210 nano-technology Selectivity Pyrolysis |
| Popis: | Novel electrocatalysts based on zinc oxide (ZnO) and biochars are prepared through a simple and scalable route and are proposed for the electrocatalytic reduction of CO₂ (CO₂RR). Materials with different weight ratios of ZnO to biochars, namely, pyrolyzed chitosan (CTO) and pyrolyzed brewed waste coffee (CBC), are synthesized and thoroughly characterized. The physicochemical properties of the materials are correlated with the CO₂RR to CO performance in a comprehensive study. Both the type and weight percentage of biochar significantly influence the catalytic performance of the composite. CTO, which has pyridinic- and pyridone-N species in its structure, outperforms CBC as a carbon matrix for ZnO particles, as evidenced by a higher CO selectivity and an enhanced current density at the ZnO_CTO electrode under the same conditions. The study on various ZnO to CTO weight ratios shows that the composite with 40.6 wt % of biochar shows the best performance, with the CO selectivity peaked at 85.8% at −1.1 V versus the reversible hydrogen electrode (RHE) and a CO partial current density of 75.6 mA cm–² at −1.3 V versus RHE. It also demonstrates good stability during the long-term CO₂ electrolysis, showing high retention in both CO selectivity and electrode activity. |
| Databáze: | OpenAIRE |
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