Capacitive deionization is a promising desalination technique to tackle with freshwater scarcity, due to its facile, energy-efficient and eco-friendly operation. Carbon materials are primary electrode materials in capacitive deionization devices; however, their practical applications are limited by the low salt adsorption capacity and poor cycling stability. Here, we report a pre-oxidized strategy to significantly improve the salt adsorption capacity and cycling lifespan of carbon clothes. By the simple pre-oxidation treatment, it creates abundant ultramicropores and a superhydrophilic surface, which lead to a high salt adsorption capacity (31.5 mg g⁻¹ and 13 mg cm⁻³) in 0.01 M NaCl aqueous solution. Moreover, the surface of each carbon fiber is oxidized, combined with a high mechanical strength, resulting in a stable surface during the cycling process. The retention rate is 74% even after 5000 adsorption/desorption cycles in diluted seawater. This work provides a new avenue to the design of high-performance, low-cost, and durable electrodes for capacitive deionization applications.

电容去离子法因其操作简便、节能且环保，是解决淡水短缺问题的一种很有前景的海水淡化技术。碳材料是电容去离子装置中的主要电极材料；然而，它们的实际应用受到盐吸附能力低和循环稳定性差的限制。在这里，我们报告了一种预氧化策略，可显着提高碳衣的盐吸附能力和循环寿命。通过简单的预氧化处理，它产生丰富的超微孔和超亲水表面，从而在0.01 M NaCl水溶液中具有高盐吸附容量（31.5 mg g ^-1和13 mg cm ^{-3 ）。}此外，每根碳纤维的表面均经过氧化处理，并具有较高的机械强度，从而在循环过程中形成稳定的表面。在稀释海水中经过5000次吸附/解吸循环后，保留率仍为74%。这项工作为电容去离子应用的高性能、低成本和耐用电极的设计提供了新途径。