摘要
分别以乙醇、异丙醇、正丁醇为溶剂配制涂液,采用刷涂热分解法制备了稀土Nd共掺杂的Ti/SnO2-Sb-Nd电极。采用SEM、XRD、伏安电荷、电化学孔隙率、分形维数、降解苯酚实验等研究了溶剂对电极微观形貌、晶体结构和电化学性能的影响。结果表明:随着所用醇类溶剂的与羟基相连的碳链复杂化和延长,制得电极涂层的微观表面趋于平整,物理比表面积变小。碳链最长的正丁醇溶剂体系制得了结晶最好的SnO2电极涂层,并且有效的阻止了钛基体被氧化。按照乙醇、异丙醇、正丁醇顺序,相应的3种电极的伏安电荷分别为1.783,2.074,2.884 mC.cm-2,这表明电极的电化学活性面积依次增大;电极涂层的电化学孔隙率分别为97.78%,53.11%,51.68%;电极涂层的分形维数分别为1.892,1.978,1.968;当累积通电量为4.783 Ah.L-1时,苯酚降解率分别达到87.49%,90.04%,91.50%,在此过程中槽压分别升高了3.94,1.48,1.44 V。伏安电荷、电化学孔隙率和分形维数的变化规律有效地反映了电极的电催化氧化活性和稳定性的变化。
Ti/SnO2-Sb-Nd electrodes co-doped with rare earth element Nd were prepared by brushing-pyrolysis with ethanol, isopro- panol or n-butanol as solvent respectively. SEM, XRD, voltammetric charge, electrochemical porosity, fractal dimension and phenol degradation tests were applied to study the effects of solvent on characterizations and performances of the electrodes. The results showed that microscopic surfaces of the electrode coatings tended to be smooth, and physical specific surface areas decreased as carbon chains connected with alcoholic hydroxyl became complicated and extended. The best SnO2 crystal coating was prepared when n-butanol was used as solvent, and at the same time n-butanol solvent protected titanium base from oxidation. By ethanol, isopropanol, n-butanol order, vohammetric charges of corresponding electrodes were 1. 783, 2. 074 and 2. 884 mC·cm-2 respectively, and it indicated that electrochemical active surface areas increased in that order; electrochemical porosities were 97.78%, 53.11% and 51.68% respectively; fractal dimensions were 1. 892, 1. 978 and 1. 968 respectively ; the rates of degradation reached to 87.49%, 90.04% and 91.50% respectively when 4. 783 Ah·L-1 of specific charges were applied, and at the same time cell voltages increased by 3.94, 1.48 and 1.44 V respectively. Regularities of voltammetric charge, electrochemical porosity and fractal dimension of the electrodes reflected variations of electro-catalytic oxidation activity and stability effectively.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2011年第5期725-730,共6页
Chinese Journal of Rare Metals
关键词
溶剂
钛电极
伏安电荷
电化学孔隙率
分形维数
solvent
DSA
voltammetric charge
electrochemical porosity
fractal dimension
