Synthesis of Free-Standing Metal Sulfide Nanoarrays via Anion Exchange Reaction and Their Electrochemical Energy Storage Application
Synthesis of Free-Standing Metal Sulfide Nanoarrays via Anion Exchange Reaction and Their Electrochemical Energy Storage Application
复制标题
DOI：
10.1002/smll.201302224
复制
发表时间：
2014-02-01
期刊：
影响因子：
13.3
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Xia, Xinhui;Zhu, Changrong;Fan, Hong Jin
金属硫化物是一类新兴的高性能太阳能电池和电化学储能装置电极材料。本文报道了一种基于阴离子交换反应的简单而有效的方法，通过金属氧化物和氢氧化物预成形的拓扑转化来实现金属硫化物纳米阵列。在碳布和泡沫镍衬底上进行了CoS和NiS纳米线、纳米墙和核心分支纳米树的演示。硫化纳米阵列在电化学储能方面表现出优异的氧化还原反应性。采用自支撑CoS纳米线阵列作为伪电容阴极进行了测试，结果表明，与粉末阴极相比，该阵列具有更高的倍率比容量和更长的循环寿命。硫化物纳米阵列具有优异的电化学性能，这是由于在阴离子交换反应后，纳米阵列的结构得以保留，并且与电流收集器保持了刚性连接。
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 pre-forms. 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.