普鲁士蓝
电容去离子
金属有机骨架
碳纤维
材料科学
化学工程
无机化学
氧化还原
模板方法模式
纳米技术
化学
吸附
电化学
有机化学
电极
复合材料
工程类
冶金
物理化学
复合数
作者
Fanyue Meng,Zibiao Ding,Xingtao Xu,Yong Liu,Ting Lü,Likun Pan
标识
DOI:10.1016/j.seppur.2023.123899
摘要
Prussian blue analogues (PBAs) are considered as exceptionally promising faradic electrode materials for next-generation capacitive deionization (CDI) electrodes due to their superior theoretical specific capacity, non-toxic property and simple preparation. However, the desalination performances of PBAs are hampered by their sluggish intrinsic kinetics and insufficient utilization of active sites. Herein, we demonstrate an advanced hybrid material constructed by anchoring nickel hexacyanoferrate (Ni-PBA) onto three-dimensional (3D) nitrogen-doped porous carbon (ZC) derived from zinc-based metal–organic frameworks (MOFs, ZIF-8) polyhedron. ZC with a 3D open structure not only provides multiple spatial supports for the in-situ growth of Ni-PBA with extraordinary redox capacity, but also features high electrical conductivity, excellent hydrophilicity and large surface area to facilitate the electron/ion transport and improve the ion accommodation. Therefore, the Ni-PBA/ZC composite electrode achieves an outstanding CDI desalination performance with an ultrahigh salt adsorption capacity (SAC) of 43.9 mg g−1 and maximum salt adsorption rate (mSAR) of 20.82 mg g−1 min−1, outperforming those of most of the recently reported MOF-derived porous carbon materials and PBAs-based materials. The strategy in this work presents a novel avenue by combining the advantages of MOF-derived porous carbon and redox-active materials for designing high-performance CDI electrode materials.
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