Rechargeable Zn-CO<sub>2</sub> Electrochemical Cells Mimicking Two-Step Photosynthesis.
basic_science · Level V
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- Record sourced from PubMed, PMID 30803058.
- Also identified by DOI 10.1002/adma.201807807.
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Abstract
Metal-CO<sub>2</sub> batteries represent a promising priority for sustainable energy and the environment. However, CO<sub>2</sub> utilization in nonaqueous electrolytes mostly involves difficult CO<sub>2</sub> electrochemistry, leading to poor selectivity and limited cycle performance. Herein, an aqueous rechargeable Zn-CO<sub>2</sub> electrochemical cell that tunably produced CO fuel gas (90% Faradaic efficiency) during cell discharge (cathodic reaction: CO<sub>2</sub> + 2e<sup>-</sup> + 2H<sup>+</sup> → CO + H<sub>2</sub> O) and O<sub>2</sub> during cell charge at ≈2 V (cathodic reaction: H<sub>2</sub> O → 1/2O<sub>2</sub> + 2e<sup>-</sup> + 2H<sup>+</sup> ), mimicking the separate steps of CO<sub>2</sub> fixation and water oxidation during photosynthesis while exhibiting the advantages of high efficiency, tunable products, and operation independent of sunlight is proposed and realized. The cell achieves a remarkable energy efficiency of 68% with fuel generation, providing an alternative for the green, efficient, and safe utilization of CO<sub>2</sub> by metal-CO<sub>2</sub> batteries.
Medical subject headings
- Biomimetic Materials
- Carbon Dioxide
- Electric Power Supplies
- Zinc