采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗...采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗粒组成,颗粒间有一定的孔隙,掺杂钴酸镧电极涂层含有Ti,Ru,La及Co金属元素,相结构主要为金红石相,掺杂钴酸镧电极涂层的晶粒较小,不同掺杂量对晶粒大小影响不大。电化学研究表明,电极具有典型的钌氧化物所具备的电化学性能,掺杂钴酸镧电极的电化学面积较大,电极的可逆性能得到改善。所制备的电极具有大致相同的析氧电位(1.19 V vs. SCE),随着钴酸镧掺杂量的增多,Tafel斜率依次减小,表明掺杂钴酸镧电极的活性较高,且掺杂钴酸镧后电极强化寿命得到显著提高。展开更多
The contribution of cinnamon extract on leaching of aluminum (Al) cook wares was investigated using two aluminum alloys (Indian and Egyptian) and pure Al. The cinnamon (Cin) was extracted by heating the Cin sticks at ...The contribution of cinnamon extract on leaching of aluminum (Al) cook wares was investigated using two aluminum alloys (Indian and Egyptian) and pure Al. The cinnamon (Cin) was extracted by heating the Cin sticks at 90°C in distilled water for an hour to make the 10% stock solution. This study was done in aqueous solutions in presence and absence of 1% NaCl using weight loss at 90°C. Moreover surface study (SEM and EDX) and electrochemical methods (Open Circuit Potential and Tafel plot) were applied. The addition of Cin solutions to 1% NaCl decreased the corrosion rates in weight loss and electrochemical method compared to 1% NaCl solutions which showed an inhibitive property of Cin solution. The inhibition was found to obey the modified Langmuir isotherm with a negative Langmuir ΔGads indicating the spontaneous nature of adsorption even at 90°C. The EDX surface analysis of the Al surface immersed in Cin + NaCl revealed the composition of the pits formed. From Tafel method, it was found that the corrosion current density of pure Al was more than that of the Egyptian alloy. The apparent activation energy values for Cin, Cin + NaCl and NaCl solution were evaluated and discussed.展开更多
文摘采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗粒组成,颗粒间有一定的孔隙,掺杂钴酸镧电极涂层含有Ti,Ru,La及Co金属元素,相结构主要为金红石相,掺杂钴酸镧电极涂层的晶粒较小,不同掺杂量对晶粒大小影响不大。电化学研究表明,电极具有典型的钌氧化物所具备的电化学性能,掺杂钴酸镧电极的电化学面积较大,电极的可逆性能得到改善。所制备的电极具有大致相同的析氧电位(1.19 V vs. SCE),随着钴酸镧掺杂量的增多,Tafel斜率依次减小,表明掺杂钴酸镧电极的活性较高,且掺杂钴酸镧后电极强化寿命得到显著提高。
文摘The contribution of cinnamon extract on leaching of aluminum (Al) cook wares was investigated using two aluminum alloys (Indian and Egyptian) and pure Al. The cinnamon (Cin) was extracted by heating the Cin sticks at 90°C in distilled water for an hour to make the 10% stock solution. This study was done in aqueous solutions in presence and absence of 1% NaCl using weight loss at 90°C. Moreover surface study (SEM and EDX) and electrochemical methods (Open Circuit Potential and Tafel plot) were applied. The addition of Cin solutions to 1% NaCl decreased the corrosion rates in weight loss and electrochemical method compared to 1% NaCl solutions which showed an inhibitive property of Cin solution. The inhibition was found to obey the modified Langmuir isotherm with a negative Langmuir ΔGads indicating the spontaneous nature of adsorption even at 90°C. The EDX surface analysis of the Al surface immersed in Cin + NaCl revealed the composition of the pits formed. From Tafel method, it was found that the corrosion current density of pure Al was more than that of the Egyptian alloy. The apparent activation energy values for Cin, Cin + NaCl and NaCl solution were evaluated and discussed.
