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首页> 外文期刊>Environmental Science & Technology >Performance Loss of Activated Carbon Electrodes in Capacitive Deionization: Mechanisms and Material Property Predictors
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Performance Loss of Activated Carbon Electrodes in Capacitive Deionization: Mechanisms and Material Property Predictors

机译：电容式去离子活性炭电极的性能损失：机制和材料性能预测因子

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摘要

Understanding the material property origins of performance decay in carbon electrodes is critical to maximizing the longevity of capacitive deionization (CDI) systems. This study investigates the cycling stability of electrodes fabricated from six commercial and two post-processed activated carbons. We find that the capacity decay rate of electrodes in half cells is positively correlated with the specific surface area and total surface acidity of the activated carbons. We also demonstrate that half-cell cycling stability is consistent with full cell desalination performance durability. Additionally, our results suggest that increase in internal resistance and physical pore blockage resulting from extensive cycling may be important mechanisms for the specific capacitance decay of activated carbon electrodes in this study. Our findings provide crucial guidelines for selecting activated carbon electrodes for stable CDI performance over long-term operation and insight into appropriate parameters for electrode performance and longevity in models assessing the techno-economic viability of CDI. Finally, our half-cell cycling protocol also offers a method for evaluating the stability of new electrode materials without preparing large, freestanding electrodes.
机译：了解碳电极中性能衰减的材料性质起源对于最大化电容去离子（CDI）系统的寿命至关重要。本研究研究了由六种商业和两种后处理的活性碳制造的电极的循环稳定性。我们发现，半细胞中电极的容量衰减率与活性碳的比表面积和总表面酸度呈正相关。我们还证明，半细胞循环稳定性与全细胞脱盐性能耐久性一致。此外，我们的结果表明，由于广泛的循环产生的内阻和物理孔隙堵塞的增加可能是该研究中活性炭电极的特定电容衰减的重要机制。我们的调查结果提供了用于选择活性炭电极的重要指南，以便在长期运行和洞察中熟悉CDI的技术经济可行性的模型中的电极性能和寿命的适当参数。最后，我们的半电池循环协议还提供了一种用于评估新电极材料稳定性而不准备大型独立电极的方法。

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  • 来源
    《Environmental Science & Technology》 |2020年第23期|15516-15526|共11页
  • 作者

    Xitong Liu; Sneha Shanbhag; Sittichai Natesakhawat; Jay F. Whitacre; Meagan S. Mauter;

  • 作者单位

    Department of Civil & Environmental Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Civil and Environmental Engineering The George Washington University Washington D.C. 20052 United States;

    Department of Civil & Environmental Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States;

    National Energy Technology Laboratory U.S. Department of Energy Pittsburgh Pennsylvania 15236 United States Department of Chemical and Petroleum Engineering University of Pittsburgh Pittsburgh Pennsylvania 15260 United States;

    Department of Engineering and Public Policy Department of Material Science and Engineering and The Scott Institute for Energy Innovation Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States;

    Department of Civil and Environmental Engineering Stanford University Stanford California 94305 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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