WO3 with hierarchical flower-like architectures has been obtained by calcination of WO3 center dot 0.33H(2)O, which is initially prepared via a hydrothermal method with formic acid as a structure directing agent. For the hierarchical flower-like structure, each flower petal is composed of a number of tiny nanorods and the smooth degree of the surface is tuned by the additive amount of HCOOH. As the hierarchical architecture shortens the diffusion paths of the electrolyte ions, improves the dynamic performance and supplies more active sites, the samples exhibit high discharge capacities and long cycling life. Especially, high discharge capacities of 1284.5 mA h g(-1), 904.1 mA h g(-1), 829.3 mA h g(-1), 576.8 mA h g(-1) and 861 mA h g(-1) are achieved when the current densities are 100 mA g(-1), 200 mA g(-1), 250 mA g(-1), 500 mA g(-1) and 100 mA g(-1), respectively.
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机译：通过煅烧WO3中心点0.33H（2）O，已获得具有分层花状结构的WO3，该煅烧最初是通过水热法以甲酸作为结构导向剂制备的。对于分层的花状结构，每个花瓣由许多微小的纳米棒组成，并且表面的光滑度通过HCOOH的添加量进行调整。由于分层结构缩短了电解质离子的扩散路径，提高了动态性能并提供了更多的活性位，因此样品具有高放电容量和长循环寿命。特别是当电流流过时，可达到1284.5 mA hg（-1），904.1 mA hg（-1），829.3 mA hg（-1），576.8 mA hg（-1）和861 mA hg（-1）的高放电容量。密度分别为100 mA g（-1），200 mA g（-1），250 mA g（-1），500 mA g（-1）和100 mA g（-1）。
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