论文部分内容阅读
研究了MnO_x活性层焙烧温度对Ti/SnO_2+Sb_2O_3/MnO_x电极性能的影响．用XRD、SEM对电极活性层的结构、形貌进行了表征,通过极化曲线和循环伏安曲线研究了电极在25℃1．0mol/L H_2SO_4溶液中的电催化活性,并应用阳极快速寿命检测法测定了电极寿命．结果表明：焙烧温度为200℃时,只有β-MnO_2生成；焙烧温度在300和400℃之间时,同时有α-Mn_2O_3和β-MnO_2晶体生成,即在该温度范围内,α-Mn_2O_3和β-MnO_2共存；焙烧温度高于450℃时,在实验条件下,只有α-Mn_2O_3的衍射峰．焙烧温度对电极电催化活性和电极寿命有显著的影响,α-Mn_2O_3和β-MnO_2共存时电极具有较低的析氧电位．焙烧温度为400℃时制备的电极电催化活性较高,快速寿命检测法测得其电极寿命达39h,具有良好的稳定性．
The effect of calcination temperature of MnO_x active layer on the properties of Ti / SnO_2 + Sb_2O_3 / MnO_x electrodes was investigated. The structure and morphology of the electrode active layer were characterized by XRD and SEM. The electrocatalytic activity of the electrode in 1.0 mol / L H 2 SO 4 solution at 25 ℃ was investigated by polarization curve and cyclic voltammetry. The anode rapid life The test method determines the electrode life. The results show that only β-MnO 2 is formed when the calcination temperature is 200 ℃. At the calcination temperature between 300 and 400 ℃, both α-Mn 2 O 3 and β-MnO 2 crystals are formed, that is, α-Mn 2 O 3 and β-MnO 2 coexist. When the calcination temperature is higher than 450 ℃, only α-Mn 2 O 3 diffraction peaks are obtained under the experimental conditions. The calcination temperature has a significant effect on the electrocatalytic activity and electrode life of the electrode, and the electrode has a lower oxygen evolution potential when α-Mn 2 O 3 and β-MnO 2 coexist. The electrode prepared at the calcination temperature of 400 ℃ has higher electrocatalytic activity and the electrode life of 39h, measured by the rapid life test, has good stability.