New testing procedures of a capacitive deionization reactor
New testing procedures of a capacitive deionization reactor
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DOI：
10.1039/c3cp50514f
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Anderson, Marc
中科院分区：
文献类型：
--
作者：
Garcia-Quismondo, Enrique;Gomez, Roberto;Anderson, Marc
目前，根据传统的充放电曲线，充电电容去离子(CDI)系统的能量消耗往往是不同参数(充电电流、电容和放电电流)的函数，很难区分这些参数对CDI性能和能源效率的影响。因此，能效受到工艺前一个充放电阶段的电流的强烈影响。我们一直发现，这种现象，据我们所知，在以前的CDI通信中没有得到解决，当对每个充电和放电周期施加不同的电流时，这种现象要强烈得多。这里报告的调查提供了对CDI运行方面的机械分析，并开发了一种新的程序，允许准确评估性能和能源效率。此外，这里开发的模型允许人们分离充电和放电周期，因此有助于为需要实现去离子和再生步骤的有效分离的真实设备定义操作模式。这种分析方法不仅对CDI有用，而且对其他电化学系统也有用，例如在二次电池和超级电容器中，通常采用充放电。
Currently, according to conventional charge-discharge profiles, energy consumed in charging Capacitive Deionization (CDI) systems is always a function of different parameters (current used for charging, capacitance and current employed for discharging) making it difficult to separate the effect of these parameters on CDI performance and energy efficiency. Thus, energy efficiencies are strongly influenced by the current in the preceding charge or discharge stage of the process. We find consistently that this phenomenon, which to our knowledge has not been addressed in previous CDI communications, is much more intense when different currents are applied for each of the charging and discharging cycles. The investigation reported here provides a mechanistic analysis of the operational aspects of CDI and develops a new procedure that allows for a precise evaluation of performance and energy efficiency. Furthermore, the model developed here allows one to separate charge and discharge cycles, and therefore contributes to the possibility of defining an operational mode for real-world devices in which effective separation of deionization and regeneration steps needs to be implemented. This method of analysis could be useful not only for CDI but also for other electrochemical systems such as in secondary batteries and supercapacitors where charge and discharge are typically employed.