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Energy-Efficient Capacitive Deionization through Electrode Modification and Process Development
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DOI：10.1021/acssuschemeng.4c09320.png)
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Abstract
En 中文
Electrochemical separation technologies, such as capacitive deionization (CDI), are promising for addressing global energy and water challenges. However, there is a need to improve the performance, better understand property-performance relationships, and evaluate the longevity of CDI electrodes. This study explores the chemical modification of electrodes and the adjustment of CDI operating parameters. Results indicate that nitric acid (HNO3) conditioning of activated carbon cloth (ACC) electrodes removes metal oxides, introduces oxygen and nitrogen functionalities, and increases the specific capacitance (16% at 1 mV/s). Moreover, these changes in electrode properties positively impact device-level CDI performance. Through HNO3-conditioning of the ACC and tuning of the operational parameters, this work demonstrates higher electrosorption capacity (4.0x), greater charge efficiency (90% vs 24%), and lower energy consumption (3.8x). Despite these enhancements, limitations of the HNO3-conditioned ACC include decreased desorption kinetics and a 32% loss in electrosorption capacity after 200 cycles. Overall, this work provides guidance on using oxidative pretreatment via HNO3 to modify ACC electrodes for CDI and evaluates the trade-offs associated with varying operational parameters.
Keywords:
separation
electrosorption
activated carbon
pretreatment
flow rate
half-cycle time
Journal
IF:
7.3
Papers:
1.7W
Citations:
10.7W