Ultra-Small Platinum Nanoparticles Encapsulated in Sub-50 nm Hollow Titania Nanospheres for Low-Temperature Water-Gas Shift Reaction

被引：35

作者：

Zhao, Hongyu ^{[1
,2
]}

Yao, Siyu ^{[4
]}

Zhang, Mengtao ^{[4
]}

Huang, Fei ^{[3
]}

Fan, Qikui ^{[1
,2
]}

Zhang, Shumeng ^{[1
,2
]}

Liu, Hongyang ^{[3
]}

Ma, Ding ^{[4
]}

Gao, Chuanbo ^{[1
,2
]}

机构：

[1] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710054, Shaanxi, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710054, Shaanxi, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China

[4] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 43期

基金：

中国国家自然科学基金;

关键词：

ultra-small platinum nanoparticles; hollow titania nanospheres; encapsulation; water-gas shift; size-dependent catalysis; ENHANCED PHOTOCATALYTIC ACTIVITY; CATALYTIC-OXIDATION REACTIONS; METAL-SUPPORT INTERACTIONS; CO OXIDATION; GOLD NANOPARTICLES; PYRROLE HYDROGENATION; MESOPOROUS SILICA; FERROUS CENTERS; PARTICLE-SIZE; TIO2; SHELLS;

D O I：

10.1021/acsami.8b12192

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ultra-small platinum nanoparticles loaded over titania is a promising catalyst for the low-temperature water gas shift (WGS) reaction and shows the potential to work in a mobile hydrogen fuel cell system. Their precise size engineering (<3 nm) and reliable stabilization remain challenging. To address these issues, we report a reverse-micelle synthesis approach, which affords uniform ultra-small platinum nano particles (tunable in similar to 1.0-2.6 nm) encapsulated in hollow titania nanospheres with a shell thickness of only similar to 3-5 nm and an overall diameter of only similar to 32 nm. The Pt@TiO2 yolk/shell nanostructured catalysts display extraordinary stability and monotonically increasing activity with the decreasing size of the Pt nanoparticles in the WGS. The size-dependent variation in the electronic property of the Pt nanoparticles and the reducible oxide encapsulation that prevents the Pt nanoparticles from sintering are ascribed as the main reasons for the excellent catalytic performance.

引用

页码：36954 / 36960

页数：7