Electroreduction of CO2 to Formate on a Copper-Based Electrocatalyst at High Pressures with High Energy Conversion Efficiency
| Autor: | Yun Kuang, Wei Hsuan Hung, Ching Yu Chiang, Jinyu Guo, Yongtao Meng, Aowen Li, Hongjie Dai, Xin Tian, Xiaoming Sun, Ching Shun Ku, Wu Zhou, Mingquan Xu, Guanzhou Zhu, Jiachen Li, Xiao Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Electrolytic cell Inorganic chemistry Energy conversion efficiency General Chemistry 010402 general chemistry Electrochemistry Electrocatalyst 01 natural sciences Biochemistry Catalysis Cathode 0104 chemical sciences Anode law.invention chemistry.chemical_compound Colloid and Surface Chemistry law Formate Faraday efficiency |
| Zdroj: | Journal of the American Chemical Society. 142:7276-7282 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Electrocatalytic CO2 reduction (CO2RR) to valuable fuels is a promising approach to mitigate energy and environmental problems, but controlling the reaction pathways and products remains challenging. Here a novel Cu2O nanoparticle film was synthesized by square-wave (SW) electrochemical redox cycling of high-purity Cu foils. The cathode afforded up to 98% Faradaic efficiency for electroreduction of CO2 to nearly pure formate under ≥45 atm CO2 in bicarbonate catholytes. When this cathode was paired with a newly developed NiFe hydroxide carbonate anode in KOH/borate anolyte, the resulting two-electrode high-pressure electrolysis cell achieved high energy conversion efficiencies of up to 55.8% stably for long-term formate production. While the high-pressure conditions drastically increased the solubility of CO2 to enhance CO2 reduction and suppress hydrogen evolution, the (111)-oriented Cu2O film was found to be important to afford nearly 100% CO2 reduction to formate. The results have implications for CO2 reduction to a single liquid product with high energy conversion efficiency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|