Mixed-Dimensional Pt-Ni Alloy Polyhedral Nanochains as Bifunctional Electrocatalysts for Direct Methanol Fuel Cells

被引：113

作者：

Xia, Tianyu ^{[1
]}

Zhao, Kai ^{[1
]}

Zhu, Youqi ^{[2
]}

Bai, Xiaoyan ^{[1
]}

Gao, Han ^{[1
]}

Wang, Ziyu ^{[3
]}

Gong, Yue ^{[4
]}

Feng, Menglin ^{[1
]}

Li, Shunfang ^{[1
]}

Zheng, Qiang ^{[4
]}

Wang, Shouguo ^{[5
]}

Wang, Rongming ^{[6
]}

Guo, Haizhong ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Phys & Microelect, Key Lab Mat Phys, Minist Educ, Zhengzhou 450052, Peoples R China

[2] Beijing Inst Technol, Res Ctr Mat Sci, Beijing Key Lab Construction Tailorable Adv Funct, Beijing 100081, Peoples R China

[3] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Peoples R China

[4] CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, CAS Key Lab Standardizat & Measurement Nanotechnol, Beijing 100190, Peoples R China

[5] Anhui Univ, Sch Mat Sci & Engn, Hefei 230039, Peoples R China

[6] Univ Sci & Technol Beijing, Inst Multidisciplinary Innovat, Beijing 100083, Peoples R China

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 02期

基金：

中国国家自然科学基金;

关键词：

methanol oxidation; mixed-dimensional materials; oxygen reduction; polyhedral nanochains; Pt-Ni alloy electrocatalysts; OXYGEN REDUCTION REACTION; ANISOTROPIC GROWTH; NANOPARTICLES; NANOWIRES; CO; SIZE; NANOCRYSTALS; NANOTUBES; CATALYSIS; SURFACE;

D O I：

10.1002/adma.202206508

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pt nanocatalysts play a critical role in direct methanol fuel cells (DMFCs) due to their appropriate adsorption/desorption energy, yet suffer from an unbalanced relationship between size-dependent activity and stability. Herein, mixed-dimensional Pt-Ni alloy polyhedral nanochains (Pt-Ni PNCs) with an ordered assembly of a nanopolyhedra-nanowire-nanopolyhedra architecture are fabricated as bifunctional electrocatalysts for DMFCs, effectively alleviating the size effect. The Pt-Ni PNCs exhibit 7.23 times higher mass activity for the anodic methanol oxidation reaction (MOR) than that of commercial Pt/C. In situ Fourier transform infrared spectroscopy and CO stripping measurements demonstrate the prominent stability of the Pt-Ni PNCs to resist CO poisoning. For the cathodic oxygen reduction reaction (ORR), a positive half-wave potential exceeding Pt/C is achieved by the Pt-Ni PNCs, and it can be well maintained for 10 000 cycles with negligible activity decay. The designed nanostructure can alleviate the agglomeration and dissolution problems of 0D small-sized Pt-Ni alloy nanocrystals and enrich surface atom steps and active facets of 1D chain-like nanostructures. This work provides a proposed strategy to improve the catalytic performance of Pt-based nanocatalysts by constructing novel interfacial relationships in mixed dimensions to alleviate the imbalance between catalytic activity and catalytic stability caused by size effects.

引用

页数：9

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