论文部分内容阅读
利用水溶液电沉积法制备La Mg_2Ni_9储氢合金膜,通过测定合金膜的循环伏安曲线(CV)、交流阻抗(EIS)、Tafel极化曲线等研究其电化学性能,采用扫描电镜(SEM)、X射线衍射(XRD)、能谱(EDS)对合金膜表面形貌、结构及组成进行研究。结果表明:电沉积电流密度为40 A/dm~2时,La Mg_2Ni_9合金膜的表面粗糙并伴有裂纹,析氢电流密度为5.37A/dm~2,表观活化自由能△G~≠最低为47.26 k J/mol,证明合金膜良好的析氢性能;吸附值Q达到最大值为0.091μF·cm~(-2),表明合金膜具有较高的储氢性能。
La Mg_2Ni_9 hydrogen storage alloy films were prepared by aqueous solution electrodeposition method. The electrochemical properties of the films were investigated by cyclic voltammetry (CV), alternating current impedance (EIS) and Tafel polarization curves of the films. SEM, X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) were used to study the morphology, structure and composition of the alloy films. The results show that the surface of La Mg_2Ni_9 alloy film is rough and cracked when the current density is 40 A / dm ~ 2, the current density is 5.37 A / dm ~ 2, the lowest △ G ~ ≠ is 47.26 kJ / mol, which proves the good hydrogen evolution property of the alloy film. The maximum value of adsorption Q is 0.091μF · cm ~ (-2), indicating that the alloy film has high hydrogen storage capacity.