Highly Efficient CO 2 Utilization via Aqueous Zinc– or Aluminum–CO 2 Systems for Hydrogen Gas Evolution and Electricity Production
| Autor: | Yejin Yang, Jaephil Cho, Changmin Kim, Sangwook Joo, Guntae Kim, Meilin Liu, Jeongwon Kim, Jeeyoung Shin |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Aqueous solution Hydrogen 010405 organic chemistry chemistry.chemical_element General Medicine General Chemistry Zinc 010402 general chemistry Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences Carbon utilization Electricity generation Chemical engineering chemistry Dissolution |
| Zdroj: | Angewandte Chemie International Edition. 58:9506-9511 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201904763 |
| Popis: | Atmospheric carbon dioxide (CO2 ) has increased from 278 to 408 parts per million (ppm) over the industrial period and has critically impacted climate change. In response to this crisis, carbon capture, utilization, and storage/sequestration technologies have been studied. So far, however, the economic feasibility of the existing conversion technologies is still inadequate owing to sluggish CO2 conversion. Herein, we report an aqueous zinc- and aluminum-CO2 system that utilizes acidity from spontaneous dissolution of CO2 in aqueous solution to generate electrical energy and hydrogen (H2 ). The system has a positively shifted onset potential of hydrogen evolution reaction (HER) by 0.4 V compared to a typical HER under alkaline conditions and facile HER kinetics with low Tafel slope of 34 mV dec-1 . The Al-CO2 system has a maximum power density of 125 mW cm-2 which is the highest value among CO2 utilization electrochemical system. |
| Databáze: | OpenAIRE |
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