期刊
CARBON
卷 73, 期 -, 页码 163-174出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.02.052
关键词
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资金
- University of Nottingham
- Royal Society
- Engineering and Physical Sciences Research Council [GR/R68078/01, GR/R68078/02, EP/F026412/1, EP/J000582/1] Funding Source: researchfish
- EPSRC [EP/J000582/1, EP/F026412/1] Funding Source: UKRI
Carbon was deposited on a mild steel cathode during electrolysis in the molten mixture of Li2CO3 and K2CO3 (mole ratio: 62:38) under CO2 or mixed N-2 and CO2 atmospheres at 3.0-5.0 V and 540-700 degrees C. In a three-electrode cell, cyclic voltammetry was applied on a platinum working electrode to study the reduction and deposition processes. A two-electrode cell helped correlate electrolysis variables, e.g. temperature and voltage, with the deposition rate, current efficiency, and properties of the deposited carbon powders. High current efficiency (>90%) and deposition rate (>0.11 g cm(-2) h(-1)) were achieved in the study. Elemental analysis of the electro-deposits, following washing with HCl solutions (2.3-7.8 molL(-1)), showed carbon as the dominant element (75-95 wt.%) plus oxygen (5-10 wt.%) and small amounts of other elements related to materials of the electrolytic cell. Thermogravimetry detected fairly low onset combustion temperatures (310-430 degrees C), depending on the electrolysis and acid washing conditions. Amorphous and various nanostructures (sheet, rings and quasi-spheres) were revealed by electron microscopy in carbon samples deposited under different process conditions. The specific surface area of the carbon deposited at 5.0 V and 540 degrees C was as high as 585 m(2) g(-1). An analysis of the energy consumption suggests several ways for efficiency improvement so that the electrolytic carbon from CO2 will become commercially attractive. (C) 2014 Elsevier Ltd. All rights reserved.
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