具有核壳结构IrO_2@Ti的电解水析氧催化剂的研究  

Research on Core-Shell Structured IrO_2@Ti of Oxygen-Evolution Catalysts by Electrolysis of Water

作　　者：孙良良 罗凌虹 石纪军 程亮 刘丽丽 徐序 SUN Liangliang LUO Linghong SHI Jijun CHENG Liang XU Xu(J/ngdezhen Ceram/c /nstitute, Jingdezhen 333000, Chin)

机构地区：[1]景德镇陶瓷大学,景德镇333000

出　　处：《中国陶瓷》2017年第7期36-40,共5页China Ceramics

摘　　要：以H_2IrCl_6·nH_2O和钛粉为主要原料,采用硼氢化钠还原法制备铱包裹钛(Ir@Ti)催化剂。通过在450℃、500℃和550℃不同温度下对Ir@Ti催化剂进行加热处理,制备IrO_2包裹Ti(IrO_2@Ti)催化剂。通过X射线衍射(XRD)、电子扫描显微镜(SEM)和电化学工作站研究合成催化剂的结构以及作为电解水工作电极的析氧性能。研究表明:该方法制备的IrO_2@Ti催化剂,纳米级IrO_2分布在Ti颗粒表面,形成了具有核壳结构的包裹型催化层。500℃下处理的IrO_2@Ti催化剂的具有最高的析氧活性。按照Ir∶Ti的摩尔比为1∶2,1∶6,1∶10配置的IrO_2@Ti催化剂,随着IrO_2含量的增高,形成了IrO_2外壳型结构,IrO_2催化层包覆在可以有效降低析氧电位。其中1∶2的催化剂的析氧性能最优,在常压下,25℃时,电解水电流为0.24 A·cm^(-2)时的电解电压为3 V。The Ir@Ti catalyst was prepared by reduction method by sodium borohydride reduction using H2IrC16 nH20and Ti particles as raw materials. The IrO2@Ti catalysts were obtained through heating treatment of Ir@Ti catalystat different temperatures of 450 ℃, 500 ℃ and 550 ℃ . The structure of synthesized catalyst and oxygen evolutionperformance for electrolysis water electrode were investigated by X-ray diffraction （XRD）, scanning electron microscope（SEM） and electrochemical workstation. Results showed that the nanoscale IrO2 distributed on the surface of Ti particleswith the formation of core-shell structured catalyst layer. The IrO2@Ti catalyst had the highest oxygen evolutionactivity at treatment of 500 ℃ . With the increase of IrO2 content, it can be formed IrO2 shell type structure and theIrO2 catalyst layer could effectively reduce the oxygen evolution potential. The oxygen evolution performance was thebest when the IrO2 Ti molar radio was 1 ： 2. Its electrolytic voltage was 3 V when the current was 0.24 A · cm-1 atatmosphere pressure and 25 ℃ .

关 键 词：固体聚合物电解质 电解水 析氧电极 燃料电池 

分 类 号：TQ426.94[化学工程]