阶梯形貌铁基普鲁士蓝制备及性能
Preparation and Performance of Stepped Surface Iron-based Prussian Blue
陈晓轩 1刘常 2高彦峰 1刘宇2
作者信息
- 1. 上海大学 材料科学与工程学院,上海 200444
- 2. 中国科学院上海硅酸盐研究所,上海 200050
- 折叠
摘要
采用柠檬酸辅助单一源法水热制备了具有表面从边缘向中心依次凹陷降低形貌的铁基普鲁士蓝(S-FePBA).与典型立方形貌FePBA(C-FePBA)相比,BET测试证明阶梯型特殊形貌使其具有增大一倍的比表面积,EIS 测试证明其具有更低的阻抗.不同扫描速率下的循环伏安分析证明其具有赝电容效应,从而具有优异的倍率性能.电流密度由 0.1 A/g增大到 5 A/g,容量几乎不变,保持率为 94%.此外不同电压下的非原位XRD测试证明其具有良好的结构可逆性,循环稳定性优良,在 0.6 A/g电流密度下循环 1500 次后容量保持率为 89%.
Abstract
Iron-based Prussian blue with a stepped morphology(S-FePBA)was prepared by citric acid-assisted single-source hydrothermal method in this paper.Compared with the typical cubic morphology FePBA(C-FePBA),it shows larger specific surface area due to its unique stepped morphology according to the BET test.And the EIS test shows that it has a lower impedance.Cyclic voltammetry analysis at varied scan rates proves that it has a pseudocapacitance effect,which contribute to its good rate performance.When the current density increases from 0.1 A/g to 5 A/g,it shows no obvious capacity fading with 94%capacity retention.In addition,the ex-situ XRD test at different voltages shows that it has good structural reversibility,leading to an excellent cycling stability with capacity retention of 89%over 1500 cycles at 0.6 A/g.
关键词
水系电池/钠离子电池/普鲁士蓝类似物/正极材料/形貌优化Key words
aqueous battery/sodium ion battery/prussian blue analogues/cathode material/morphology optimization引用本文复制引用
基金项目
内蒙古自治区科技计划资助(2021ZD0033)
出版年
2024
国家科技期刊平台
NSTL
万方数据