(武漢理工大學(xué) 材料復(fù)合新技術(shù)國家重點實驗室，武漢 430070)
摘 要: 在惰性氣氛條件下，以IrCl3？nH2O為原料，通過溶膠-凝膠法制備納米棒IrO2催化劑。采用X射線衍射、透射電子顯微鏡和電化學(xué)性能測試分別對所得催化劑樣品的物相組成、形貌結(jié)構(gòu)和電化學(xué)性能進行表征。XRD結(jié)果顯示，催化劑樣品IrO2是直徑為10~20 nm、長度約為90 nm的金紅石型納米棒狀單晶氧化物。循環(huán)伏安測試表明，電極電勢低于0.3 V或高于1.2 V時催化劑表面發(fā)生水的電解反應(yīng)，而電極電勢約為0.83 V時催化活性中心離子對(Ir(III)/Ir(IV))發(fā)生自身氧化還原反應(yīng)。線性掃描電勢測試表明，所制備 IrO2納米棒催化劑的析氧電催化活性高于商業(yè)IrO2催化劑的析氧電催化活性，且當(dāng)電極電勢為1.7 V時其析氧電催化活性約是商業(yè)催化劑析氧電催化活性的1.38倍。
關(guān)鍵字: IrO2；納米棒；溶膠-凝膠法；析氧反應(yīng)
（State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,
Wuhan University of Technology, Wuhan 430070, China）
Abstract:IrO2 nano-rod catalysts were prepared using IrCl3？nH2O as raw material by sol-gel method under inert atmosphere. Their phase composition, morphology and electrochemical performance were characterized by X-ray diffractometry, transmission electron microscopy and electrochemical properties test techniques, respectively. The result of XRD indicates that the catalyst sample IrO2 is a single crystal nanorod rutile oxide with a diameter in the range of 10-20 nm and a length of around 90 nm. The results of cyclic voltammetries show that, when the electrode potential is lower than 0.3 V or higher than 1.2 V, a water electrolysis reaction can be detected on the catalyst samples. The transforming process of catalytic activity center ion pair Ir(III)/Ir(IV) takes place at electrode potential of about 0.83 V. Finally, linear sweep voltammetry reveals that the oxygen evolution reaction catalytic activity of IrO2 nanorods is superior to that of the commercial IrO2 catalysts, which is about 1.38 times as much as that of the commercial catalysts at electrode potential of about 1.7 V.
Key words: IrO2; nano-rods; sol-gel method; oxygen evolution reaction
