定向多壁碳纳米管电化学储氢研究

利用恒流充放电、循环伏安曲线(CV)和电化学阻抗技术(EIS)等方法对定向多壁碳纳米管(AMWCNTs)储氢的电化学行为及其储氢机制进行了探讨.研究表明,定向AMWCNTs-Cu电极有较高的电化学储氢性能,其储氢容量在1500mA/g的电流密度下可以达到1162mA·h/g.定向AMWCNTs的电化学储氢能力强与其空间结构有关,而铜粉的加入有利于提高碳纳米管的电催化反应表面积和电极电化学反应活性,有利于氢在碳纳米管中扩散,从而提高了碳纳米管电极材料的储氢量.

Electrochemical Storage Hydrogen of the Aligned Multi-walled Carbon Nanotubes

The mechanism of electrochemical storage hydrogen in the aligned multi-walled carbon nanotubes(AMWCNTs) was investigated by using charge-discharge test, cyclic voltammetry(CV) and electrochemical impedance spectra. A high discharge capacity of 1 162 mA·h/g of the AMWCNTs-Cu was obtained at a current density of 1 500 mA/g. The high capacity of the AMWCNTs is related to the space structure. The addition of copper power into the AMWCNTs is advantageous to increase the electro-catalyzed reaction areas of the AMWCNTs electrode and improve its electrochemical activity. The copper powder could also accelerate the diffusion of hydrogen in AMWCNTs-Cu electrode, so the AMWCNTs-Cu electrode has a higher capacity of storage hydrogen.