Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583, Singapore.
Small. 2014 Jul 9;10(13):2611-7. doi: 10.1002/smll.201303889. Epub 2014 Mar 14.
Nanostructuring is a key approach in enhancing the performance of electrochemical devices. In this work, nanostructuring is achieved by the electrodeposition of nickel hydroxide nanowire arrays, with both open-ended and close-ended structures, through anodized aluminium oxide (AAO) templates that are directly fabricated on indium tin oxide/glass substrates. The open-ended and close-ended nanostructures are compared together with identically fabricated thin films to show the effects of nanostructuring. Open-ended nanowire arrays demonstrated the best electrochemical activity with superior transmittance modulation and faster activation, while the thin film showed the worst performance. In comparing with the close-ended structures, enhanced performance is observed for the open-ended structures despite the use of less material for the latter. This demonstrates that in designing nanostructures or porous materials, it is important for the porosity to have both interconnectivity and exposure to the electrolyte in electrochemical reactions.
纳米结构化是提高电化学器件性能的关键方法。在这项工作中，通过在氧化铟锡/玻璃衬底上直接制造的阳极氧化铝（AAO）模板，通过电沉积实现了具有开放式和封闭式结构的氢氧化镍纳米线阵列的纳米结构化。将开放式和封闭式纳米结构与相同制造的薄膜进行比较，以展示纳米结构化的效果。开放式纳米线阵列表现出最佳的电化学活性，具有更高的透光率调制和更快的激活速度，而薄膜表现出最差的性能。与封闭式结构相比，尽管后者使用的材料较少，但开放式结构的性能得到了增强。这表明，在设计纳米结构或多孔材料时，对于电化学反应中的孔隙率，连通性和与电解质的暴露都很重要。
