IrO2改性钛网对固体聚合物电解质电解器集电极层电化学性能的影响  

Effect of IrO_2 Modification of Ti Mesh on Electrochemical Performance of Collector Layer for Solid Polymer Electrolyte Electrolyzer

作　　者：宋宇琨 吕洪[1,2] 郝传璞[1,2] 米灿根 

机构地区：[1]同济大学新能源汽车工程中心 [2]汽车学院,上海201804 [3]湖南大学材料科学与工程学院,长沙410012

出　　处：《高等学校化学学报》2015年第7期1378-1384,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21306141)资助~~

摘　　要：采用亚当斯熔融法（Adams fusion method）在钛网上包覆Ir O2催化剂,并将其用作固体聚合物电解质（SPE）电解器的阳极集电极,发现其可以显著降低电解过电位.通过X射线多晶衍射（XRD）和透射电子显微镜（TEM）分析发现,包裹在钛网上的Ir O2催化剂晶粒为2.0~3.0 nm,结晶度良好;交流阻抗谱（EIS）和循环伏安（CV）分析结果表明,改性的钛网集电极层可增加三相反应活性点,使三相反应通道由催化层延伸到集电极层,活性催化剂表面积增大,从而大幅度降低了活化阻抗,电解性能获得提升.通过对不同Ir O2催化剂负载量改性的钛网进行研究发现,随着钛网负载Ir O2量的增加,在相同电流密度下,极化曲线的过电位先减小后增加,当Ir O2负载量为1.38%（质量分数）时,电解池的过电位最低,在1 A/cm2电流密度下,过电位为2.028 V.Modified Ti meshes used as anode collector layer of solid polymer electrolyte （SPE） electrolyzer were prepared through Adams fusion method. The Ti mesh modification synchronized with IrO2 preparation. The physico-chemical properties of the modified Ti meshes and IrO2 catalyst were studied by scanning electron microscopy（SEM）, X-ray diffraction（XRD） and transmission electron mieroscopy（TEM）. An IrO2 layer was formed onto the Ti mesh＇ s surface and the size of anode catalyst IrOz was in nanoscale. The SPE electrolyzer employing modified Ti mesh showed a higher performance due to the extension of three-phase activity sites from catalyst layer to diffusion layer. 100 mesh Ti mesh showed lower Rot and better catalyst loadings compared with 50 mesh one, and owned a good durability as well. Ti meshes with different catalyst loadings the Ti mesh with 1.38% （mass fraction） catalyst loading exhibited the best performance, potential of 2. 028 V at a current density of 1 A/cm2. were tested and which yielded a potential of 2. 028 V at a current density of 1 A/cm2.

关 键 词：固体聚合物电解质电解器 亚当斯熔融法 阳极集电极 IrO2催化剂 改性钛网 

分 类 号：O643[理学—物理化学]