Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 6, Issue 6, Pages 1361-1366Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi00090a
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Funding
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454, JCYJ20170817110251498]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
- National Natural Science Foundation of China [21875097, 21671096, 21603094]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06G587]
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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.
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