真空烧结下Ti_nO_(2n-1)多孔电极的制备及性能
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摘要
为给工业制备Ti_nO_(2n-1)多孔电极提供技术支持,以TiH_2与TiO_2为合成原料,采用高温烧结-压片法制备了Ti_nO_(2n-1)电极。通过扫描电镜(SEM)、X射线衍射仪(XRD)进行材料表征,探究了制备Ti_nO_(2n-1)电极的工艺合理性,利用电化学工作站考察了自制Ti_nO_(2n-1)电极的性能。结果表明:TiH_2与TiO_2的摩尔比为1∶5,真空下烧结温度为950℃时,可得到主相为Ti_4O_7的Ti_nO_(2n-1)电极。将自制的亚氧化钛电极与石墨电极分别进行阳极极化测试,亚氧化钛电极析氧电位维持在2.25 V,远高于石墨电极的1.60 V,在循环伏安测试中,Ti_nO_(2n-1)电极表现出很高的电化学稳定性。
In this paper,Ti_nO_(2n-1) electrode was prepared by high temperature sintering-pressing method with TiH_2 and TiO_2 as raw materials.Materials were characterized by SEM and XRD technology,and the preparation process of Ti_nO_(2n-1) electrode was explored. The electrochemical performance of Ti_nO_(2n-1) electrode was investigated by electrochemical workstation. Results showed that Ti_nO_(2n-1) electrode with Ti_4O_7 as main phase was obtained when the molar ratio of TiH_2 to TiO_2 was 1 ∶ 5 and the sintering temperature was 950 ℃ in vacuum. The anodic polarizations of the self-made titania electrode and the graphite electrode were measured. The oxygen evolution potential of the titania electrode was maintained at 2.25 V,which was much higher than that of the graphite electrode at 1.60 V and the Ti_nO_(2n-1) electrode exhibited high electrochemical stability in cyclic voltammetry.
In this paper,Ti_nO_(2n-1) electrode was prepared by high temperature sintering-pressing method with TiH_2 and TiO_2 as raw materials.Materials were characterized by SEM and XRD technology,and the preparation process of Ti_nO_(2n-1) electrode was explored. The electrochemical performance of Ti_nO_(2n-1) electrode was investigated by electrochemical workstation. Results showed that Ti_nO_(2n-1) electrode with Ti_4O_7 as main phase was obtained when the molar ratio of TiH_2 to TiO_2 was 1 ∶ 5 and the sintering temperature was 950 ℃ in vacuum. The anodic polarizations of the self-made titania electrode and the graphite electrode were measured. The oxygen evolution potential of the titania electrode was maintained at 2.25 V,which was much higher than that of the graphite electrode at 1.60 V and the Ti_nO_(2n-1) electrode exhibited high electrochemical stability in cyclic voltammetry.
引文
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[2]钟登杰,胡芝悦.电化学法处理生活污水研究进展[J].工业水处理,2016,36(4):5-9.
[3]瓮青松,杨富国,阮善菊,等.电化学方法处理分散红染料废水的研究[J].广东化工,2016,43(10):173-174.
[4]WU W,HUANG Z H,LIM T T.Recent development of mixed metal oxide anodes for electrochemical oxidation of organic pollutants in water[J].Applied Catalysis A General,2014,480(20):58-78.
[5]RAO A N S,VENKATARANGAIAH V T.Metal oxide-coated anodes in wastewater treatment[J].Environmental Science&Pollution Research International,2014,21(5):3 197-3 217.
[6]陈卫国,朱锡海.电催化产生H2O2和·OH及去除废水中有机污染物的应用[J].中国环境科学1998:18(2):148-150.
[7]李联,何平,李洪,等.Ti5O9-Ti4O7电极电化学处理2,4,6-三硝基苯酚废水[J].化工环保,2015,35(4):420-425.
[8]ANDERSSON S,Collén B,KUYLENSTIERNA U,et al.Phase analysis studies on the titanium-oxygen system[J].Acta Chemica Scandinavica,1957,11(10):1 641-1 652.
[9]ANDERSSON S,Magnéli A.Diskrete titanoxydphasen im Zusammensetzungsbereich Ti O1.75-TiO1.90[J].Naturwissenschaften,1956,43(21):495-496.
[10]WALSH F C,WILLS R G A.The continuing development of Magnéli phase titanium sub-oxides and Ebonex electrodes[J].Electrochimica Acta,2010,55(22):6 342-6 351.
[11]应卓高.Magnéli相TinO2n-1基复合正极材料的制备及其储锂性能研究[D].杭州:浙江工业大学,2014:27-32.
[12]应杭君,田华军,孟阵,等.TinO2n-1系列氧化物的特性、制备方法及应用[J].化学进展,2015,27(4):361-372.
[13]WANG G,LIU Y,YE J,et al.Fabrication of Rod-like Ti4O7with High Conductivity by Molten Salt Synthesis[J].Materials Letters,2017,186:361-363.
[14]ZHU R,LIU Y,YE J,et al.Magnéli phase Ti4O7powder from carbothermal reduction method:formation conductivity and optical properties[J].Journal of Materials Science:Materials in Electronics,2013,24(12):4 853-4 856.
[15]GUSEV A A,AVVAKUMOV E G,VMOKUROVA O B.Synthesis of Ti4O7magneli phase using mechanical activation[J].Science of Sintering,2003,35(3):141-145.