高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (5): 1063.doi: 10.7503/cjcu20170444

• 物理化学 • 上一篇    下一篇

三维多孔结构Pt-Ag气凝胶的制备及电催化氧还原反应性能

黄骥培, 李毅, 杨申辉, 周亚洲, 程晓农, 朱佳, 杨娟   

  1. 江苏大学材料科学与工程学院, 镇江 212013
  • 收稿日期:2017-07-10 出版日期:2018-04-16 发布日期:2018-04-16
  • 作者简介:

    联系人简介: 杨 娟, 女, 博士, 教授, 博士生导师, 主要从事无机纳米功能材料研究. E-mail: yangjuan6347@mail.ujs.edu.cn ;程晓农, 男, 博士, 教授, 博士生导师, 主要从事功能材料研究. E-mail: xncheng@mail.ujs.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 51572114, 51672112)和江苏大学创新项目(批准号: Y15A65)资助.

Synthesis of Three-dimensional Pt-Ag Aerogels and Their Electrocatalytic Performance Toward Oxygen Reduction Reaction

HUANG Jipei, LI Yi, YANG Shenhui, ZHOU Yazhou, CHENG Xiaonong*, ZHU Jia, YANG Juan*   

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2017-07-10 Online:2018-04-16 Published:2018-04-16
  • Contact: CHENG Xiaonong,YANG Juan
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.51572114, 51672112) and the Innovation Project of Jiangsu University, China(No.Y15A165).

摘要:

采用化学还原法及水热法制备了具有树枝状结构的铂-银气凝胶, 并对其进行酸碱刻蚀再处理获得刻蚀后的铂-银气凝胶催化剂. 利用X射线粉末衍射仪(XRD)、 扫描电子显微镜(SEM)和透射电子显微镜(TEM)等表征了铂-银气凝胶的结构、 组成及微观形貌. 利用循环伏安法(CV)和线性扫描伏安法(LSV)测试了催化剂对氧还原反应(ORR)的电催化活性和稳定性. 结果表明, 刻蚀后的Pt-Ag气凝胶具有优异的ORR活性, 在0.9 V处, 刻蚀后Pt-Ag气凝胶的质量比活性和面积比活性分别为166.3 mA/mgPt和0.295 mA/cm2, 分别是商业铂/碳催化剂(20%Pt/C)的2.0倍和1.8倍. 该催化剂还具有优异的稳定性, 循环5000周后, 动力学催化质量比活性和面积比活性分别只降低了6.1%和9.1%, 远小于商业Pt/C的35%和52.1%.

关键词: Pt-Ag 气凝胶, 酸碱刻蚀, 氧还原反应, 循环稳定性

Abstract:

The etched-platinum-silver aerogel(e-Pt-Ag gel) electrocatalysts with dendritic morphology were synthesized by chemical reduction and hydrothermal method, in which silver nanoparticles were removed by acid- and alkali-etching. X-ray diffraction(XRD), scanning electronic microscopy(SEM) and transmission electron microscopy(TEM) were employed to characterize the composition, structure and morphology of e-Pt-Ag gel. The activity and stability of the catalysts for oxygen reduction reaction(ORR) were studied by cyclic voltammetry(CV) and linear sweeping voltammetry(LSV) methods. The results show that the e-Pt-Ag gel exhibits excellent ORR performance and favorable durability. In detail, the mass and specific activities of e-Pt-Ag gel at 0.9 V are 166.3 mA/mgPt and 0.295 mA/cm2, respectively, which are 2.0 and 1.8 times that of the commercial Pt/C catalyst[84.9 mA/mgPt and 0.163 mA/cm2]. Furthermore, the mass and space activities of the e-Pt-Ag gel only decay 6.1% and 9.1%, respectively, after 5000 electrochemical cycles, showing higher durability of the e-Pt-Ag gel compared with Pt/C(35%, 52.1%).

Key words: Pt-Ag aerogel, Acid- and alkali-etching, Oxygen reduction reaction, Cycle stability

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