N-doped carbon-encapsulated nickel on reduced graphene oxide materials for efficient CO2 electroreduction to syngas with potential-independent H2/CO ratios
| Autor: | Yu Liu, Jinglin Mu, Fangyuan Wang, Yuzhen Zhao, Mei Wu, Yingzhi Cheng, Jin Zhou, Zhichao Miao, Lechen Diao, Manfen Liang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene Process Chemistry and Technology Oxide chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Pollution Catalysis law.invention Nickel chemistry.chemical_compound Chemical engineering chemistry law Chemical Engineering (miscellaneous) 0210 nano-technology Waste Management and Disposal Faraday efficiency 0105 earth and related environmental sciences Syngas |
| Zdroj: | Journal of Environmental Chemical Engineering. 9:105515 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2021.105515 |
| Popis: | Electrochemical CO2 reduction (ECR) is a sustainable method for obtaining syngas, which is largely desired for producing high energy-dense hydrocarbons and alcohols through the industrialized process. However, it is still a challenge to adjust the H2/CO ratio in a wide range while holding a large current density. Guiding by the density functional theory (DFT) calculations, the electrocatalyst of N-doped carbon-encapsulated metallic Ni particles supported on reduced graphene oxide (Ni@N–C/rGO) is developed for ECR to tunable syngas. The quantitative Ni@N–C responses to the controllable catalytic activity of ECR to CO, while the rGO serves as both HER catalyst and support of Ni@N-C. The Ni@N-C/rGO material exhibits high CO2 reduction activity and stability, thereby achieving a specific current of 23 mA cm−2 and CO Faradaic efficiency (FE(CO)%) of 90% at − 0.97 V vs. RHE. More importantly, the H2/CO ratio of the syngas can be adjusted in a large range of 9/1–1/9 without potential-dependence while maintaining large current densities (> 15 mA cm−2). |
| Databáze: | OpenAIRE |
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