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½üÆÚ£¬ºþÄÏ´óѧ²ÄÁÏѧԺÔÚJournal of Chemistry Materials AÉϱ¨µÀÁËͨ¹ýÕûºÏ¾ßÓв»Í¬ÄÜ´ø²îµÄÁ½ÖÖ»îÐÔÎïÖÊ£¬½«Á½Õß¹¹Öþ³ÉÒìÖʽṹÓÃ×÷ÄÆÀë×ӵĴ洢¡£Ñо¿Ö¤Ã÷£¬Á½ÖÖ»îÐÔÎïÖʵÄÄÜ´ø²îÒìÔ½´ó£¬Ëù¹¹ÖþÒìÖʽṹÄڵ糡Խǿ£¬Ô½ÄÜ´Ù½øÄÆÀë×ÓÔÚ²ÄÁÏÄÚ²¿µÄ¿ìËÙ´«Êä¡£¸Ã²ÄÁÏÔÚ50A/gµÄµçÁ÷ÃܶÈÏ£¬ÈÝÁ¿ÈԸߴï235mAh/g£¬µç³ØÄÜÔÚ17sÄÚÍê³É³ä·Åµç¹ý³Ì¡£¸Ã¹¤×÷Ϊ¹¹Öþ¿ìËÙÀë×Ó´«ÊäµÄ¸º¼«²ÄÁÏÌṩÁËÓÐЧµÄÉè¼ÆË¼Â·¡£ Title: Fabrication of strong internal electric field ZnS/Fe9S10 heterostructures for highly efficient sodium ion storage Journal: J. Mater. Chem. A, 2019, DOI: 10.1039/C9TA02388G Abstract: The interfacial properties of electrode materials have a crucial impact on enhancing their charge transfer. However, a deep understanding of this aspect remains elusive. Herein, we provide an effective strategy to manipulate the internal electric field (E-field) of metal sulfide heterostructures to accelerate their Na-ion storage kinetics. To prove this concept, we selected ZnS and Fe9S10 with a large energy bandgap difference as model components with the aim to build a strong E-field at their hetero-interfaces, thus fabricating stable ZnS/Fe9S10 heterostructures for high-rate and high-capacity sodium ion storage. The emerging built-in E-field in the carbon-coated ZnS/Fe9S10 heterostructures can accelerate ion/electron migration rates and facilitate charge transfer behavior by the internal driving force of the E-field, guaranteeing enhanced reaction reversibility and sodium storage kinetics. These engineered heterostructures deliver a high initial coulombic efficiency of 85.3%, a high reversible capacity of 636 mA h g−1 at 500 mA g−1 and stable cycling performance. In particular, they also exhibit superior rate capacities of 295 mA h g−1 at 30 A g−1 and 235 mA h g−1 at 50 A g−1, indicating that this battery can be fully charged within 17 s. More importantly, this design concept can be extended to construct other heterostructures, such as ZnS and Sn2S3. Link: https://pubs.rsc.org/en/content/ ... unauth#!divAbstract |
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