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Nature:红色染料可用于制造“绿色”电池

来源:科技日报 2012-12-17 20:21

纽约市立大学、莱斯大学和美国陆军研究实验室的研究人员合作开发出一种无毒环保型锂离子电池,这种“绿色”电池中,从茜草植物的根中提取的染料茜素替代了电极中常用的钴。相关研究成果刊登在最新一期的《自然》杂志在线版上。

早在3500年前,茜素就在中亚、埃及、欧洲和中国被作为红色染料使用。第一次煮玫瑰茜草的根会出现鲜艳的橙色、红色和粉红色,1826年,法国的皮埃尔·让确认了茜草根含有两种染料,即茜素红及红紫素(羟基茜素)。这种曾在过去被作为天然植物染料用于制作热焰红的纺织品,现今通过最新技术,可用来制备新型“绿色”电池。

莱斯大学机械工程及材料科学系教授雷迪博士指出,大多数锂离子电池电极依赖于开采有限的金属矿石,如钴。

纽约市立大学化学教授乔治·约翰说,幸运的是,天然成分红紫素和其“亲戚”具有制作电池电极的特性。例如,红紫素的分子六元(芳族的)环含有善于传递电子的羰基和羟基,富含电子,很容易与锂离子结合。此外,茜草或其他生物质作物在成长中会吸收二氧化碳,新型锂电池被扔掉时不带有毒成分。该研究小组估计,仅需数年之久“绿色”锂离子电池便可商业化。(生物谷Bioon.com)

Lithium storage mechanisms in purpurin based organic lithium ion battery electrodes

Arava Leela Mohana Reddy Subbiah Nagarajan Porramate Chumyim Sanketh R. GowdaPadmanava Pradhan Swapnil R. Jadhav Madan Dubey George John Pulickel M. Ajayan

Current lithium batteries operate on inorganic insertion compounds to power a diverse range of applications, but recently there is a surging demand to develop environmentally friendly green electrode materials. To develop sustainable and eco-friendly lithium ion batteries, we report reversible lithium ion storage properties of a naturally occurring and abundant organic compound purpurin, which is non-toxic and derived from the plantmadder. The carbonyl/hydroxyl groups present in purpurin molecules act as redox centers and reacts electrochemically with Li-ions during the charge/discharge process. The mechanism of lithiation of purpurin is fully elucidated using NMR, UV and FTIR spectral studies. The formation of the most favored six membered binding core of lithium ion with carbonyl groups of purpurin and hydroxyl groups at C-1 and C-4 positions respectively facilitated lithiation process, whereas hydroxyl group at C-2 position remains unaltered.

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