Enhancement of Catalytic Activity via Inevitable Reconstruction of the Ni-Mo Interface for Alkaline Hydrogen Oxidation

被引：2

作者：

Song, Xiaoyun ^{[1
]}

Yang, Qimei ^{[1
]}

Chen, Zebi ^{[1
]}

Zou, Kaisheng ^{[1
]}

Xie, Zhenyang ^{[1
]}

Ding, Wei ^{[1
]}

Wei, Zidong ^{[1
]}

机构：

[1] Chongqing Univ, State Key Lab Adv Chem Power Sources SKLACPS, Sch Chem & Chem Engn, Ctr Adv Elect Energy CAEE,Inst Adv Interdisciplin, Chongqing, Peoples R China

来源：

SMALL | 2024年 / 20卷 / 40期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

electrochemistry; fuel cells; hydrogen oxidation; interfacial reconstruction; nickel-based catalyst; ELECTRONIC-STRUCTURE; HIGH-PERFORMANCE; ENERGY; OXIDES;

D O I：

10.1002/smll.202402701

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The inevitable oxidation of nickel-metal-based catalysts exposed to the air will lead to instability and poor reproducibility of a catalytic interface, which is usually ignored and greatly hinders their application for the catalysis of alkaline hydrogen oxidation. The details on the formation of a world-class nickel-based HOR catalyst Ni-3-MoOx/C-500 are reported via an interfacial reconstruction triggered by passive oxidation upon air exposure. Interfacial reconstruction, initiated with various Ni-Mo metal ratios and annealing temperature, can fine-tune the Ni-Mo interface with an increased work function and a reduced d-band center. The optimized Ni-3-MoOx/C exhibits a record high mass activity of 102.8 mA mgNi(-1), a top-level exchange current density of 76.5 mu A cmNi(-2), and exceptional resistance to CO poisoning at 1000 ppm CO for hours. The catalyzed alkaline exchange membrane fuel cell exhibits a maximum power output of 600 mW cm(-2) and excellent stability, ranking it as one of the most active non-precious metals HOR catalysts to date.

引用

页数：8

共 35 条

[1] A class of non-precious metal composite catalysts for fuel cells [J].