Uniform and well‐defined Rh nanonail flowers were successfully prepared by a facile solvothermal approach. The as‐prepared Rh nanonail flower with a crown diameter of about 90 nm consisted of twelve uniform nanonails originated from the same center with highly symmetrical distribution, in which each nanonail bounded with {111} facets was about 45 nm in length comprised of a pentaprism‐shaped nail stem of 10 nm in cross section and a pentapyramid‐shaped nail cap of 20 nm in diameter. The volume ratio of ethylamine (EA)/oleamine (OAm) was essential for the formation of the highly symmetrical Rh nanonail flowers. The selective adsorption of EA and OAm on (111) and (100) planes of the dodecahedral seeds, followed by the lateral epitaxial growth and the axial growth of pentagonal surfaces, drove to form the pentapyramid caps and pentaprism stems, respectively. The as‐prepared Rh nanonail flowers demonstrated significantly enhanced electrocatalytic activity and higher stability than commercial Rh black.

中文翻译：

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高度对称的Rh纳米指甲花

通过简便的溶剂热方法成功制备了均匀且轮廓分明的Rh纳米指甲花。制备的冠状直径约90 nm的Rh纳米指甲花由十二个均匀的纳米指甲组成，这些纳米指甲起源于同一中心，具有高度对称的分布，其中每个与{111}面相连的纳米指甲的长度约为45 nm，由五棱镜组成横截面为10 nm的钉形指甲，直径为20 nm的五棱锥形钉帽。乙胺（EA）/油胺（OAm）的体积比对于形成高度对称的Rh纳米指甲花至关重要。EA和OAm在十二面体种子的（111）和（100）平面上的选择性吸附，然后横向外延生长和五边形表面的轴向生长，驱使形成五棱锥帽和五棱柱，分别。所制备的Rh纳米指甲花显示出比商业Rh黑色显着增强的电催化活性和更高的稳定性。