Selective edge etching to improve the rate capability of Prussian blue analogues for sodium ion batteries

Zhu, Youhuan; Wang, Bingxue; Gan, Qingmeng; Wang, Yanfang; Wang, Zhengyu; Xie, Jiwei; Gu, Shuai; Li, Zhiqiang; Li, Yingzhi; Ji, Zong-Wei; Cheng, Hua; Lu, Zhouguang

2019-06

10.1039/c9qi00090a

Inorganic Chemistry Frontiers   影响因子和分区

2052-1553

Prussian blue analogues (PBA) possess a high theoretical specific capacity for sodium ion batteries. However, cycling PBA to a high current density causes severe capacity fading. Here, we develop a selective edge-etching approach to tackle this long-standing issue of poor rate capability. Well-crystallized PBA particles were produced by hydrothermal treatment of a sodium hexacyanoferrate precursor dissolved in muriatic acid solution, which were then eroded in hydrochloric acid solution to promote selective etching along the edges of the PBA crystals. The defect concentration ([Fe(CN)(6)](4-)) on the edge is denser than that at the face or corner, which stimulates the preferred etching of edges via the defect-induced heterogeneous mechanism. Due to the increasing exposed surface area and active sites, the etched PBA display much improved electrochemical performance with a capacity of 167 mA h g(-1) at a current density of 5 mA g(-1) and a capacity retention of 82.7% when the current density was increased to 40 mA g(-1), demonstrating fast sodium ion transfer and high rate capability.

SCI ; EI

英语

第一 ; 通讯

Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06G587]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000472193200002

ROYAL SOC CHEMISTRY

20192507060641

Current density ; Etching ; Hydrochloric acid ; Metal ions

Metallurgy:531.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2

Web of Science

Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Zhu, Youhuan,Wang, Bingxue,Gan, Qingmeng,et al. Selective edge etching to improve the rate capability of Prussian blue analogues for sodium ion batteries[J]. Inorganic Chemistry Frontiers,2019,6(6):1361-1366.

Zhu, Youhuan.,Wang, Bingxue.,Gan, Qingmeng.,Wang, Yanfang.,Wang, Zhengyu.,...&Lu, Zhouguang.(2019).Selective edge etching to improve the rate capability of Prussian blue analogues for sodium ion batteries.Inorganic Chemistry Frontiers,6(6),1361-1366.

Zhu, Youhuan,et al."Selective edge etching to improve the rate capability of Prussian blue analogues for sodium ion batteries".Inorganic Chemistry Frontiers 6.6(2019):1361-1366.