Peng Gengen, Li Haibo
Ningxia Key Laboratory of Photovoltaic Materials, School of Materials and New Energy, Ningxia University Yinchuan 750021 China
RSC Adv. 2023 Mar 29;13(15):10029-10034. doi: 10.1039/d2ra07857k. eCollection 2023 Mar 27.
Owing to its high electrochemical ability, the FeP is envisioned to be the potential electrode for capacitive deionization (CDI) with enhanced performance. However, it suffers from poor cycling stability due to the active redox reaction. In this work, a facile approach has been designed to prepare the mesoporous shuttle-like FeP using MIL-88 as the template. The porous shuttle-like structure not only alleviates the volume expansion of FeP during the desalination/salination process but also promotes ion diffusion dynamics by providing convenient ion diffusion channels. As a result, the FeP electrode has demonstrated a high desalting capacity of 79.09 mg g at 1.2 V. Further, it proves the superior capacitance retention, which maintained 84% of the initial capacity after the cycling. Based on post-characterization, a possible electrosorption mechanism of FeP has been proposed.
由于其高电化学能力，FeP被设想为具有增强性能的电容去离子（CDI）的潜在电极。然而，由于活性氧化还原反应，它的循环稳定性较差。在这项工作中，设计了一种简便的方法，以MIL-88为模板制备介孔梭状FeP。多孔梭状结构不仅减轻了脱盐/盐析过程中FeP的体积膨胀，还通过提供便利的离子扩散通道促进了离子扩散动力学。结果，FeP电极在1.2 V时表现出79.09 mg g的高脱盐容量。此外，它证明了优异的电容保持率，循环后保持了初始容量的84%。基于表征结果，提出了FeP可能的电吸附机制。
