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摘要: 以酚醛-糠醛基炭气凝胶为电极,用恒电位仪提供直流电压,在静态电吸附装置进行了NaCl溶液电吸附试验。考察了NaCl溶液浓度、炭气凝胶电极厚度及施加的电位等因素对电吸附的影响。研究表明,随着NaCl溶液浓度的增加,电吸附量明显增加。在低浓度下,微孔的“电场交叠效应”非常显著。0.6V~2.0V范围的电吸附试验表明,电位在1.5V以下电吸附量随电位改变异常显著,1.5V以后变化趋缓。炭气凝胶电极厚度在0.5nm~1.5mm范围增加时,电吸附量呈现单调减少的趋势。在电压为1.2V厚度为0.5mm时,其电吸附量达到12.7mg/gCA。理想的电吸附电极应富含中孔并尽可能降低电极厚度。
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关键词:
- 电吸附,炭气凝胶,SEM,TEM
Abstract: Electrosorption of NaCl aqueous solution by phenolicfurfural based carbon aerogel (CA) was performed in a static electrosorption apparatus by applying an electric potential via a potentiostat. The effect of NaCl concentration, thickness of CA electrode and applied potential on the electrosorption capacity of the CA was investigated. It was found that electrosorption capacity increased with increasing NaCl concentration with an obvious electric field overlapping effect observed in small pores at low concentration. With increasing electric potential from 0.6-2.0V, electrosorption capacity increased dramatically below 1.5V then leveled off above 1.5V. With increasing CA electrode thickness from 0.5-1.5mm, the electrosorption capacity decreased monotonically as a result of the electric field distribution along the width of the electrode. The maximum electrosorption capacity of CA was 12.7mg/g at a potential of 1.2V and an electrode thickness of 0.5mm. A high performance electrode for electrosorption should have a large amount of mesopores and be as thin as possible.-
Key words:
- Electrosorption,Carbon aerogel,SEM,TEM
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