欢迎登录材料期刊网

材料期刊网

高级检索

目的:解决质子交换膜燃料电池贵金属催化剂利用率低、电化学稳定性差的问题,从而堆动其产业化进程。方法通过湿化学共沉积法获得低Pt特征的PtCo合金催化剂,采用欠电位沉积方法制备Au修饰的PtCo合金催化剂,应用原子吸收光谱和电化学循环伏安加速测试技术研究Au修饰PtCo合金催化剂的电化学稳定性。结果成功制备了Au修饰的PtCo合金催化剂。 Au修饰后,PtCo合金催化剂的氧还原反应性能几乎没有改变,但Co的溶蚀率得到降低,而且电化学稳定性也得到提高。结论通过采用Au等具有高电化学腐蚀电位的金属修饰Pt合金催化剂,以提高催化剂电化学稳定性的研究思路是可行的。

ABSTRACT:Objective To facilitate the commercialization of proton exchange membrane fuel cells by revolving the key issues in-cluding low utilization and deteriorated stability of noble metal catalysts. Methods After preparation of PtCo alloy catalysts with low Pt loading by a chemical co-deposition method, the gold decorated PtCo alloy catalyst was prepared in terms of an under-potential-deposition method, and then the electrochemical stability of the gold-decorated PtCo alloy catalyst was characterized by atomic ab-sorption spectroscopy and electrochemical accelerated test technique. Results Au-decorated PtCo alloy catalyst was successfully prepared. After decoration of gold, the oxygen reduction reaction activity of PtCo alloy catalysts remained unchanged, and the ero-sion rate of Co element for PtCo alloy catalysts in electrolyte solutions decreased with an improved electrochemical stability. Con-clusion It was feasible to improve the stability of PtCo alloy catalysts by decoration with metals possessing a high corrosion potential such as Au.

参考文献

[1] STEELE B C H;HEINZEL A .Materials for Fuel-cell Tech-nologies[J].NATURE,2001,414:345-352.
[2] Haifeng Lv;Shichun Mu .Nano-ceramic support materials for low temperature fuel cell catalysts[J].Nanoscale,2014(10):5063-5074.
[3] Doping He;Shichun Mu;Mu Pan .Perfluorosulfonic acid-functionalized Pt/carbon nanotube catalysts with enhanced stability and performance for use in proton exchange membrane fuel cells[J].Carbon: An International Journal Sponsored by the American Carbon Society,2011(1):82-88.
[4] Zhang J;Sasaki K;Sutter E;Adzic RR .Stabilization of platinum oxygen-reduction electrocatalysts using gold clusters[J].Science,2007(26):220-222.
[5] Daping He;Kun Cheng;Tao Peng .Bifunctional effect of reduced graphene oxides to support active metal nanoparticles for oxygen reduction reaction and stability[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2012(39):21298-21304.
[6] Yonghong Bing;Hansan Liu;Lei Zhang .Nanostructured Pt-alloy electrocatalysts for PEM fuel cell oxygen reduction reaction[J].Chemical Society Reviews,2010(6):2184-2202.
[7] Deli Wang;Huolin L. Xin;Robert Hovden .Structurally ordered intermetallic platinum-cobalt core-shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts[J].Nature materials,2013(1):81-87.
[8] Wang, Y.-J.;Wilkinson, D.P.;Zhang, J. .Noncarbon support materials for polymer electrolyte membrane fuel cell electrocatalysts[J].Chemical Reviews,2011(12):7625-7651.
[9] SCHMIDT T J;GASTEIGER H A;STAB G D et al.Charac-terization of High Surface Area Electrocatalysts Using a ro-tating Disk Electrode Configuration[J].Journal of the Elec-trochemical Society,1998,145:2354-2358.
[10] Ye Xu;Andrei V. Ruban;Manos Mavrikakis .Adsorption and Dissociation of O2 on Pt-Co and Pt-Fe Alloys[J].Journal of the American Chemical Society,2004(14):4717-4725.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%