Small. 2014 Feb 26;10(4):766-73. doi: 10.1002/smll.201302224.
Metal sulfides are an emerging class of high-performance electrode materials for solar cells and electrochemical energy storage devices. Here, a facile and powerful method based on anion exchange reactions is reported to achieve metal sulfide nanoarrays through a topotactical transformation from their metal oxide and hydroxide preforms. Demonstrations are made to CoS and NiS nanowires, nanowalls, and core-branch nanotrees on carbon cloth and nickel foam substrates. The sulfide nanoarrays exhibit superior redox reactivity for electrochemical energy storage. The self-supported CoS nanowire arrays are tested as the pseudo-capacitor cathode, which demonstrate enhanced high-rate specific capacities and better cycle life as compared to the powder counterparts. The outstanding electrochemical properties of the sulfide nanoarrays are a consequence of the preservation of the nanoarray architecture and rigid connection with the current collector after the anion exchange reactions.
金属硫化物是一类新兴的高性能电极材料，可用于太阳能电池和电化学储能器件。在此，我们报告了一种基于阴离子交换反应的简便而强大的方法，通过拓扑转化，从金属氧化物和氢氧化物前体中得到金属硫化物纳米阵列。我们以 CoS 和 NiS 纳米线、纳米墙和碳布及镍泡沫基底上的核-枝状纳米树为例进行了演示。硫化物纳米阵列在电化学储能方面表现出了优异的氧化还原反应活性。所制备的自支撑 CoS 纳米线阵列作为赝电容器的阴极进行了测试，与粉末相比，其具有更高的倍率比容量和更好的循环寿命。硫化物纳米阵列之所以具有优异的电化学性能，是因为在阴离子交换反应后，纳米阵列结构得以保留，并且与集流器之间保持刚性连接。
