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首页> 外文期刊>Journal of power sources >Fabrication and electrochemical properties of carbon nanotube/ polypyrrole composite film electrodes with controlled pore size
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Fabrication and electrochemical properties of carbon nanotube/ polypyrrole composite film electrodes with controlled pore size

机译：孔径可控的碳纳米管/聚吡咯复合膜电极的制备及电化学性能

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摘要

Carbon nanotube (CNT)/polypyrrole (PPy) composites with controlled pore size in a three-dimensional entangled structure of a CNT film are prepared as electrode materials for a pseudocapacitor. A CNT film electrode containing nanosize silica between the CNTs is first fabricated using an electrostatic spray deposition of a mixed suspension of CNTs and nanosize silica on to a platinium-coated silicon wafer. Later, nanosize silica is removed leaving a three-dimensional entangled structure of a CNT film. Before removal of the silica from the CNT/silica film electrode, PPy is electrochemically deposited on to the CNTs to anchor them in their entangled structure. Control of the pore size of the final CNT/PPy composite film can be achieved by changing the amount of silica in the mixed suspension of CNTs and nanosize silica. Nanosize silica acts as a sacrificial filler to change the pore size of the entangled CNT film. Scanning electron microscopy of the electrochemically prepared PPy on the CNT film substrate shows that the PPy nucleated heterogeneously and deposited on the surface of the CNTs. The specific capacitance and rate capability of the CNT/PPy composite electrode with a heavy loading of PPy of around 80 wt.% can be improved when it is made to have a three-dimensional network of entangled CNTs with interconnected pores through pore size control.
机译：制备在碳纳米管膜的三维缠结结构中具有受控孔径的碳纳米管（CNT）/聚吡咯（PPy）复合材料作为拟电容器的电极材料。首先使用将CNT和纳米级二氧化硅的混合悬浮液静电喷涂到镀铂的硅片上的方法，制造在CNT之间包含纳米级二氧化硅的CNT膜电极。之后，去除纳米尺寸的二氧化硅，留下CNT膜的三维缠结结构。在从CNT /二氧化硅膜电极上除去二氧化硅之前，将PPy电化学沉积到CNT上，将它们锚定在纠缠的结构中。可以通过改变CNT和纳米级二氧化硅混合悬浮液中二氧化硅的含量来控制最终CNT / PPy复合膜的孔径。纳米级二氧化硅用作牺牲填料，以改变缠结的CNT膜的孔径。在CNT膜基材上电化学制备的PPy的扫描电子显微镜观察表明，PPy异质地成核并沉积在CNT的表面上。当通过孔尺寸控制使具有相互连接的孔的缠结CNT的三维网络时，具有约80wt。％的PPy的重载的CNT / PPy复合电极的比电容和速率能力可以得到改善。

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