In situ development of highly concave and composition-confined PtNi octahedra with high oxygen reduction reaction activity and durability

被引:64
作者
Zhu, Enbo [1 ]
Li, Yongjia [1 ]
Chiu, Chin-Yi [1 ]
Huang, Xiaoqing [1 ]
Li, Mufan [2 ]
Zhao, Zipeng [1 ]
Liu, Yuan [1 ]
Duan, Xiangfeng [2 ,3 ]
Huang, Yu [1 ,3 ]
机构
[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
PtNi alloy; concave; oxygen reduction reaction; HIGH-INDEX FACETS; PEM FUEL-CELLS; ELECTROCATALYTIC ACTIVITY; PLATINUM NANOCRYSTALS; ALLOY NANOPARTICLES; PT3NI NANOCRYSTALS; NI ALLOY; CATALYSTS; SURFACES; STABILITY;
D O I
10.1007/s12274-015-0927-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Controlled syntheses of PtNi metal nanocrystals with unique structures for catalyzing oxygen reduction reactions (ORRs) have attracted great interest. Here, we report the one-step synthesis of single-crystal PtNi octahedra with in situ-developed highly concave features and self-confined composition that are optimal for ORR. Detailed studies revealed that the Pt-rich seeding, subsequent Pt/Ni co-reduction, and Pt-Ni interfusion resulted in uniform single-crystal PtNi octahedra, and that the combination of Ni facet segregation and oxygen etching of a Ni-rich surface led to the concavity and confined Ni content. The concave PtNi nanocrystals exhibited much higher ORR performance than the commercially available Pt/C catalyst in terms of both specific activity (29.1 times higher) and mass activity (12.9 times higher) at 0.9 V (vs. reversible hydrogen electrode (RHE)). The performance was also higher than that of PtNi octahedra without concavity, confirming that the higher activity was closely related to its morphology. Moreover, the concave octahedra also exhibited remarkable stability in ORR (93% mass activity remained after 10,000 cycles between 0.6 and 1.1 V vs. RHE) owing to the passivation of the unstable sites.
引用
收藏
页码:149 / 157
页数:9
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