Temperature-mediated in-situ formation of antimony nanoclusters inside carbon nanofibers for chloride-driven capacitive deionization
Temperature-mediated in-situ formation of antimony nanoclusters inside carbon nanofibers for chloride-driven capacitive deionization
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DOI：
10.1016/j.desal.2023.116471
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发表时间：
2023-05
期刊：
影响因子：
9.9
通讯作者：
Zizhen Liu;Lihao Wang;Genzhe Shen;Zixin Guo;Chengjin Qin;Xinyi Ni;Jing Cao;Xingtao Xu;
中科院分区：
文献类型：
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作者：
Zizhen Liu;Lihao Wang;Genzhe Shen;Zixin Guo;Chengjin Qin;Xinyi Ni;Jing Cao;Xingtao Xu;
脱盐动力学缓慢和耐久性差限制了faradic电极定向电容去离子（FDI）系统的实际应用。鉴于此，我们开发了一种温度介导的原位合成策略，在碳纳米纤维（Sb NCs@CNF）内制造Sb纳米团簇作为高效FDI的Cl -捕获电极。该合成策略允许Sb物种从纳米纤维中“温控蒸发”，这不仅使超小型Sb NCs的形成成为可能，而且还提供了CNF壳，以提高Sb NCs的结构稳定性和导电性。得益于Sb与Cl -离子之间的特殊相互作用、Sb NCs的超小尺寸、高表面原子比以及CNFs壳层的保护，制备的Sb NCs@CNF-based Cl -驱动FDI实现了快速的脱盐速率（通过扩大表面控制电容的贡献可达0.24 mg g - 1s - 1）和优异的循环稳定性（30次循环后脱盐能力仅降低12.4%）。除了史无前例地设计出基于Sb ncs的Cl -捕获电极材料外，本研究还为温度介导的原位合成非碳纳米管提供了一个范例，这可能会激发更多碳保护纳米管的设计和应用研究活动。
Slow desalination kinetics and poor durability constrain the practical application of faradic electrode-directed capacitive deionization (FDI) systems. In view of this, we developed a temperature-mediated in-situ synthesis strategy for fabricating Sb nanoclusters inside carbon nanofibers (Sb NCs@CNF) as Cl−capturing electrodes for high-efficiency FDI. The synthetic strategy allows “temperature-controlled evaporation” of Sb species from the nanofibers, which not only makes the formation of ultrasmall Sb NCs possible but also provides CNF shells to enhance the structural stability and electrical conductivity of Sb NCs. Benefiting from the specific interaction between Sb species and Cl−ions, ultrasmall size, high surface atom ratio of Sb NCs, as well as the protective CNFs shell, the as-fabricated Sb NCs@CNF-based Cl−-driven FDI achieved fast desalination rate (up to 0.24 mg g−1s−1, through expanding the contribution of surface-controlled capacitance) and excellent cycling stability (only 12.4 % desalination capacity reduction after 30 cycles). In addition to the unprecedented design of Sb NCs-based Cl−capturing electrode materials, this study also provides a paradigm in the temperature-mediated in-situ synthesis of non-coinage MNCs, which may stimulate more research activities in the design and application of carbon-protected MNCs.