普鲁士蓝
材料科学
电容去离子
动力学
离子
化学工程
电容感应
纳米技术
电极
电化学
物理化学
化学
物理
量子力学
计算机科学
工程类
操作系统
作者
Adekunle Adedapo Obisanya,Liang Ma,Jinkang Liu,Tianshuo Yang,Zhibin Ren,Xinyi Tan,Faming Gao,Jianren Wang
标识
DOI:10.1002/adfm.202404591
摘要
Abstract Prussian blue analogues (PBAs) are a class of promising materials for capacitive deionization. However, the kinetic mismatch between their slow ion storage rate and the demand from short‐time desalination severely limits their desalination performance. Here, a group of structure‐tuneable Ni‐Mn PBAs have been developed by a combination strategy of surface‐protected chemical etching and Ostwald ripening to study their ion storage kinetics. Treating them as demos, the characterizations and investigations, e.g., in situ XRD in a three‐electrode system, dynamic impedance, finite element simulation, and DFT calculations etc., reveal that the slow ion diffusion caused by the severe agglomeration of the nanoparticles and the unsuitable lattice parameter controls the final desalination behavior. Therefore, the correspondingly optimized sample (HC‐t) possessing a microscale hollow structure, nanoscale shell thickness, and expanded lattice, displays a fast ion storage kinetics with the ratio of surface‐controlled current as high as 82% at a scan rate of 20 mV s −1 . Consequently, it delivers an impressive desalination capacity of 120.8 mg g −1 (2.06 mmol g −1 Na + ) with a fast average desalination rate of 0.25 mg g −1 s −1 (0.004 mmol g −1 s −1 ) at 1.2 V, competitive with those reported in the literature. Moreover, the elucidation of the structure‐performance correlation provides valuable insights for the development and design of next‐generation PBAs for capacitive deionization (CDI).
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