Electrochemical formation of carbon nano-powders with various porosities in molten alkali carbonates
Electrochemical formation of carbon nano-powders with various porosities in molten alkali carbonates
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DOI：
10.1016/j.electacta.2009.03.049
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发表时间：
2009-07
影响因子：
6.6
通讯作者：
K. Van;H. Groult;F. Lantelme;M. Dubois;D. Avignant;A. Tressaud;S. Komaba;N. Kumagai;S. Sigrist-S.-Sigr
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文献类型：
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作者：
K. Van;H. Groult;F. Lantelme;M. Dubois;D. Avignant;A. Tressaud;S. Komaba;N. Kumagai;S. Sigrist-S.-Sigr
在450~700℃范围内，熔融Li-Na-K碳酸盐在共晶组成下的电化学还原为(43.5/31.5/25mol%)。用惰性玻碳电极循环伏安法分析了电化学机理。得到了平均直径在30~50 nm之间的“准球形”碳质颗粒。粉末的比表面积以及结晶度和形貌受到操作条件的强烈影响，即电位沉积、熔融碳酸盐的温度、洗涤后干燥过程的温度。在本实验条件下制备的碳具有微孔、介孔和大孔结构。每种元素的比例与操作沉积条件有很大关系。碳粉的比表面积最高(1315m2g−1)，碳粉沉积温度为450℃，施加电压为−6V，洗涤后在600℃下真空干燥。
The electrochemical reduction of molten Li–Na–K carbonates at the eutectic composition was (43.5/31.5/25mol%) performed in the range 450–700°C. The analysis of the electrochemical mechanism was done by cyclic voltammetry with an inert vitreous carbon electrode. “Quasi-spherical” carbonaceous particles were obtained with average diameter comprised between 30 and 50nm. The specific surface area as well as the crystallinity and morphology of the powders were strongly influenced by the operating conditions, i.e. potential deposition, temperature of the molten carbonates, temperature of the drying process after washing. The carbon prepared in our experimental conditions contains micro-, meso- and macroporisty. The proportion of each one is strongly dependent on the operating deposition conditions. The highest specific surface area value (1315m2g−1) was obtained with carbon powder deposited at 450°C for an applied potential of −6V and dried at 600°C under vacuum after washing.