烧结温度对含石墨烯Ti/IrTaSnSb金属氧化物阳极性能的影响
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摘要
采用热分解法制备了不同烧结温度的含石墨烯的Ti/Ir(MOE)Ta(MOE)Sn(MOE)Sb金属氧化物阳极,测试了阳极在1.5%(质量分数)Na(MOE)Cl溶液中的电化学性能,并通过SEM及EDS进行了显微形貌分析,研究了烧结温度对阳极性能的影响。结果表明:在适宜的烧结温度下,石墨烯促进Ir(MOE)O_2在阳极表面偏析,其晶粒结构主要呈枝状,并存在二次结晶现象,形成纳米针状结构,从而增大了阳极的活性表面积,提高了阳极的电催化活性;但烧结温度过高会导致石墨烯快速氧化分解,以及Ir(MOE)O_2在阳极表面偏析减少。另外,随着烧结温度的升高,阳极的电催化活性升高;当烧结温度为460℃时,阳极的析氯活性最好,随后电催化活性逐渐降低。
Ti/IrTaSnSb-G anodes were prepared by thermal decomposition at different sintering temperatures, and then characterized by means of SEM with EDS. The electrochemical performance of the anodes in 1.5%(mass fraction) Na Cl solution was assessed and the effect of sintering temperature on the property of the anodes was further studied. Results show that graphene promotes the segregation of IrO_2 with dendritic structure on the surface of anodes at the appropriate sintering temperature, and the secondary crystallization phenomenon was found to produce the nano-needle structure of IrO_2, which increases the active surface areas and improves the electrocatalytic activity of the anodes. However, the much higher sintering temperature will lead to rapid oxidative decomposition of graphene, which results in the decrease of IrO_2 on the anode surface. The study also finds that the electrocatalytic activity of the anodes increases firstly as sintering temperature rises and then the gradually becomes poor. Among others, the anode prepared by sintering at 460 ℃ presents the best performance.
Ti/IrTaSnSb-G anodes were prepared by thermal decomposition at different sintering temperatures, and then characterized by means of SEM with EDS. The electrochemical performance of the anodes in 1.5%(mass fraction) Na Cl solution was assessed and the effect of sintering temperature on the property of the anodes was further studied. Results show that graphene promotes the segregation of IrO_2 with dendritic structure on the surface of anodes at the appropriate sintering temperature, and the secondary crystallization phenomenon was found to produce the nano-needle structure of IrO_2, which increases the active surface areas and improves the electrocatalytic activity of the anodes. However, the much higher sintering temperature will lead to rapid oxidative decomposition of graphene, which results in the decrease of IrO_2 on the anode surface. The study also finds that the electrocatalytic activity of the anodes increases firstly as sintering temperature rises and then the gradually becomes poor. Among others, the anode prepared by sintering at 460 ℃ presents the best performance.
引文
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[3]Yan Z W,Zhao Y W,Zhang Z Z,et al.A study on the performance of Ir O2-Ta2O5coated anodes with surface treated Ti substrates[J].Electrochim.Acta,2015,157:345
[4]Alam R,Mobin M,Aslam J.Polypyrrole/graphene nanosheets/rare earth ions/dodecyl benzene sulfonic acid nanocomposite as a highly effective anticorrosive coating[J].Surf.Coat.Technol.,2016,307:382
[5]Ardizzone S,Bianchi C L,Cappelletti G,et al.Composite ternary Sn O2-Ir O2-Ta2O5oxide electrocatalysts[J].J.Electroanal.Chem.,2006,589:160
[6]Wei Z Q,Wang D B,Kim S,et al.Nanoscale tunable reduction of graphene oxide for graphene electronics[J].Science,2010,328:1373
[7]Kumar G V,Agarwal S,Asif M,et al.Application of response surface methodology to optimize the adsorption performance of a magnetic graphene oxide nanocomposite adsorbent for removal of methadone from the environment[J].J.Colloid Interface Sci.,2017,497:193
[8]Pocrifka L A,Gon?alves C,Grossi P,et al.Development of Ru O2-Ti O2(70-30)mol%for p H measurements[J].Sens.Actuator.,2006,113B:1012
[9]Hu J M,Sun X J,Hou Y Y,et al.Degradation characteristics of Ir O2type DSA in methanol aqueous solutions[J].Electrochim.Acta,2008,53:3127
[10]Xu L K,Xin Y L,Wang J T.A comparative study on Ir O2-Ta2O5coated titanium electrodes prepared?with different methods[J].Electrochim.Acta,2009,54:1820
[11]Ge B Y,Wang H T,Liu G Z,et al.Property of Ti/Ir O2-Ta2O5-Sn O2-Sb2O5oxide anodes for ballast water treatment system[J].Mater.Prot.,2016,49(4):10(葛宝玉,王海涛,刘光洲等.船舶压载水处理用Ti/Ir O2-Ta2O5-Sn O2-Sb2O5氧化物阳极的性能[J].材料保护,2016,49(4):10)
[12]Huang Y T,Peng Q.Progress in the study of the Ti-based metal oxide anodes[J].Total Corros.Control,2006,20(1):10(黄运涛,彭乔.钛基金属氧化物阳极的研究进展[J].全面腐蚀控制,2006,20(1):10)
[13]Xu S,Fu H T,Liu G Z,et al.Research on the influence of seawater temperature on the efficiency of production of chlorine by electrolysis[J].J.Chem.Ind.Eng.,2013,34(5):57(许实,付洪田,刘光洲等.海水温度对电解制氯效率的影响研究[J].化学工业与工程技术,2013,34(5):57)
[14]Ning H L,Xin Y L,Xu L K,et al.Study on properties of Ir O2-Ta2O5coated titanium anodes modified with graphene[J].Rare Met.Mater.Eng.,2016,45:946(宁慧利,辛永磊,许立坤等.含石墨烯Ir O2-Ta2O5涂层钛阳极性能改进研究[J].稀有金属材料与工程,2016,45:946)
[15]Trieu V,Schley B,Natter H,et al.Ru O2-based anodes with tailored surface morphology for improved chlorine electro-activity[J].Electrochim.Acta,2012,78:188
[16]La?njevac U?,Radmilovi?V V,Radmilovi?V R,et al.Ru Ox nanoparticles deposited on Ti O2nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution[J].Electrochim.Acta,2015,168:178
[17]Herrada R A,Medel A,Manríquez F,et al.Preparation of Ir O2-Ta2O5|Ti electrodes by immersion,painting and electrophoretic deposition for the electrochemical removal of hydrocarbons from water[J].J.Hazard.Mater.,2016,319:102
[18]Karlsson R K B,Hansen H A,Bligaard T,et al.Ti atoms in Ru0.3Ti0.7O2mixed oxides form active and selective sites for electrochemical chlorine evolution[J].Electrochim.Acta,2014,146:733
[19]Hsiao H Y,Chuang M C.Eliminating evolved oxygen through an electro-flocculation efficiently prompts stability and catalytic kinetics of an Ir Ox·n H2O colloidal nanostructured electrode for water oxidation[J].Electrochim.Acta,2014,137:190
[20]Rosestolato D,Fregoni J,Ferro S,et al.Influence of the nature of the electrode material and process variables on the kinetics of the chlorine evolution reaction.The case of Ir O2-based electrocatalysts[J].Electrochim.Acta,2014,139:180
[21]Xin Y L,Xu L K,Wang J T,et al.Effect of sintering temperature on microstructure and electrocatalytic properties of Ti/Ir O2-Ta2O5anodes by pechini method[J].Rare Met.Mater.Eng.,2010,39:1903(辛永磊,许立坤,王均涛等.烧结温度对Ti/Ir O2-Ta2O5纳米氧化物阳极微观结构和电催化性能的影响[J].稀有金属材料与工程,2010,39:1903)