催化作用
化学
电催化剂
氮化物
电解质
阴极
纳米颗粒
碳纤维
氮化碳
质子交换膜燃料电池
过渡金属
色散(光学)
石墨氮化碳
化学工程
无机化学
材料科学
图层(电子)
电极
电化学
复合材料
复合数
物理化学
有机化学
光催化
工程类
物理
光学
作者
Xinlong Tian,Junming Luo,Haoxiong Nan,Haobin Zou,Rong Chen,Ting Shu,Xiuhua Li,Yingwei Li,Hui‐Hua Song,Shijun Liao,Radoslav R. Adžić
摘要
The main challenges to the commercial viability of polymer electrolyte membrane fuel cells are (i) the high cost associated with using large amounts of Pt in fuel cell cathodes to compensate for the sluggish kinetics of the oxygen reduction reaction, (ii) catalyst degradation, and (iii) carbon-support corrosion. To address these obstacles, our group has focused on robust, carbon-free transition metal nitride materials with low Pt content that exhibit tunable physical and catalytic properties. Here, we report on the high performance of a novel catalyst with low Pt content, prepared by placing several layers of Pt atoms on nanoparticles of titanium nickel binary nitride. For the ORR, the catalyst exhibited a more than 400% and 200% increase in mass activity and specific activity, respectively, compared with the commercial Pt/C catalyst. It also showed excellent stability/durability, experiencing only a slight performance loss after 10,000 potential cycles, while TEM results showed its structure had remained intact. The catalyst's outstanding performance may have resulted from the ultrahigh dispersion of Pt (several atomic layers coated on the nitride nanoparticles), and the excellent stability/durability may have been due to the good stability of nitride and synergetic effects between ultrathin Pt layer and the robust TiNiN support.
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