摘要
通过热蒸发结合恒电位沉积法制备了具有核壳结构的Pd-Ag/C@Ti O2催化剂.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等对所制备样品的形貌和结构进行了表征,利用线性伏安扫描和计时电流技术研究了Pd-Ag/C@Ti O2电极对Na BH4的电氧化性能.结果表明,Pd-Ag/C@Ti O2电极具有三维纳米核壳结构,在电化学反应过程中有利于燃料与催化剂充分接触.催化剂中Pd与Ag的原子比为0.37∶0.17的Pd-Ag(2∶1)/C@Ti O2催化剂的效果最佳,在3.0 mol/L Na OH+0.20 mol/L Na BH4溶液中电流密度达到672 m A/cm2,在1200 s测试时间内计时电流曲线衰减很小,说明该Pd-Ag/C@Ti O2电极对Na BH4电氧化具有很高的电化学活性和稳定性.
Pd-Ag / C@ Ti O2 core / shell nanorods catalysts were prepared via a thermal evaporation method followed by constant potential electrodeposition. The catalysts were characterized by X-ray diffractometer（ XRD）,scanning electron microscope（ SEM） and transmission electron microscope（ TEM）. The catalytic performance of the obtained electrodes for Na BH4 electrooxidation was evaluated by means of linear scan voltammetry and chronoamperometry. The results show that the as-prepared Pd-Ag / C @ Ti O2 electrode owns special three dimensional（ 3D） core / shell structure,which is of benefit to the diffusion of the fuel and the contact between catalyst and fuel during the electrochemical reaction. The performance of Pd-Ag（ 2 ∶ 1） / C @ Ti O2 core / shell nanorods with a Pd / Ag atomic ratio of around 0. 37∶ 0. 17 is the best,of which a current density of 672 m A /cm2 in the solution containing 3. 0 mol / L Na OH ＋ 0. 20 mol / L Na BH4 was obtained. The chronoamperometric current densities remain nearly constant within a 1200 s test. The results indicate that Pd-Ag（ 2∶ 1） / C@ Ti O2 core / shell nanorods has considerable electrochemical activity and stability for Na BH4 electrooxidation.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第9期1801-1806,共6页
Chemical Journal of Chinese Universities
基金
中央高校基本科研业务费学生科技创新计划项目(批准号:HEUCFS2014)资助~~
作者简介
联系人简介：王贵领，男，博士，教授，博士生导师，主要从事化学电源研究．E-mail：wangguiling@hrbeu．edu．cn
