“…[7,8] Among the various nanostructures, many efforts have been devoted to the dendritic crystal growth patterns [9][10][11][12][13] that have a pronounced stem from which many side branches grow out and a hierarchical structure with primary, secondary, tertiary, and even high-order branches, because of their widespread potential applications in the new generation of advanced devices, such as electrochemical sensors, [12,14] lithium-ion batteries [15,16], and supercapacitors, [17] dependent on their rapid electrochemical reactions owing to the extremely large surface areas for ions transport. As one of the most promising energy storage devices, supercapacitors, also known as electrochemical capacitors, have attracted intensive research attention recently, due to their ultrahigh power density, fast charging/discharge rate and long lifespan.…”