The efficient catalytic decomposition of H2O2 by silver metals is well-known. The decomposition of concentrated H2O2 on silver metal is extremely violent with a release of intense heat, water vapor, and oxygen gas [46,47]. Despite its strong oxidizing property, H2O2 possesses a weakly reducing capability. There were few reports on using the reducing capability of H2O2 for synthesizing complex metal nanostructures [48e51]. One of the benefits of H2O2 is its benign nature as it finally decomposes to water and oxygen gas whether it functions as an oxidizing or a reducing agent.