Carbon Monoxide-Assisted Synthesis of Single-Crystalline Pd Tetrapod Nanocrystals through Hydride Formation

被引:122
作者
Dai, Yan [1 ,2 ]
Mu, Xiaoliang [1 ,2 ]
Tan, Yueming [1 ,2 ]
Lin, Kaiqiang [1 ,2 ]
Yang, Zhilin [3 ]
Zheng, Nanfeng [1 ,2 ]
Fu, Gang [1 ,2 ]
机构
[1] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[2] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[3] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China
关键词
CO ADSORPTION; SHAPE-CONTROL; HIGH-PRESSURE; METAL NANOPARTICLES; ULTRAHIGH-VACUUM; ONE-POT; SURFACE; PALLADIUM; HYDROGEN; PD(111);
D O I
10.1021/ja3006429
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Carbon monoxide can adsorb specifically on Pd(111) to induce the formation of unique Pd nanostructures. In the copresence of CO and H-2 single-crystalline Pd tetrapod nanocrystals have now been successfully prepared. The Pd tetrapods are enclosed by (111) surfaces and are yielded through hydride formation. Density functional theory calculations revealed that the formation of PdHx in the presence of H, reduces the binding energy of CO on Pd and thus helps to decrease the CO coverage during the synthesis, which is essential to the formation of the PdHx tetrapod nanocrystals. In addition to tetrapod nanocrystals, tetrahedral nanocrystals were also produced in the copresence of CO and H-2 when the reaction temperature was ramped to further lower the CO coverage. Upon aging in air, the as-prepared PdHx nanocrystals exhibited a shape-dependent hydrogen releasing behavior. The conversion rate of PdHx tetrapod nanocrystals into metallic Pd was faster than that of tetrahedral nanocrystals.
引用
收藏
页码:7073 / 7080
页数:8
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