The purpose of this work is to suggest the conception of a supercapacitor using environment-friendly materials, in addition to exhibiting good electrochemical performances. In order to lower the environmental footprint of supercapacitors, one current attempt in the literature is to replace efficient but toxic organic electrolytes by harmless, bio-friendly electrolytes such as a mixture of sodium salt with a hydrogel. However, those bio-friendly electrolytes have not been demonstrated yet to be a relevant alternative, as they are still not able of similar performances as toxic organic electrolytes. The work reported in this paper demonstrates, as a different approach, that the capacitance of a bio-friendly, hydrogel-based electrolyte combined with sodium salt can be significantly increased by adding carbon nanotubes (CNTs) to the gel. As a result, the supercapacitor using the CNT-loaded bio-friendly electrolyte has registered not only an enhanced capacitance, but also better energy and power densities compared to both the same but CNT-free electrolyte, and a toxic DMSO-based organic electrolyte.

中文翻译：

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使用基于水凝胶/碳纳米管的电解质增强绿色超级电容器

这项工作的目的是提出使用环境友好材料的超级电容器的概念，同时表现出良好的电化学性能。为了降低超级电容器的环境足迹，目前文献中的一项尝试是用无害、生物友好的电解质（例如钠盐与水凝胶的混合物）替代高效但有毒的有机电解质。然而，这些生物友好的电解质尚未被证明是一种相关的替代品，因为它们仍然无法具有与有毒有机电解质相似的性能。本文报道的工作表明，作为一种不同的方法，通过向凝胶中添加碳纳米管 (CNT)，可以显着增加与钠盐结合的生物友好型水凝胶电解质的电容。因此，