Monodispersed Co in Mesoporous Polyhedrons: Fine-tuning of ZIF-8 Structure with Enhanced Oxygen Reduction Activity

被引：90

作者：

Shah, Syed Shoaib Ahmad ^{[1
]}

Peng, Lishan ^{[1
]}

Najam, Tayyaba ^{[1
]}

Cheng, Chao ^{[1
]}

Wu, Guangping ^{[1
]}

Nie, Yao ^{[1
]}

Ding, Wei ^{[1
]}

Qi, Xueqiang ^{[1
]}

Chen, Siguo ^{[1
]}

Wei, Zidong ^{[1
]}

机构：

[1] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Chongqing Key Lab Chem Proc Clean Energy & Resour, Sch Chem & Chem Engn, Shazhengjie 174, Chongqing 400044, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2017年 / 251卷

基金：

中国国家自然科学基金;

关键词：

Bimetallic MOF; ZIF-8; ORR; Fuel cell; METAL-ORGANIC FRAMEWORKS; NITROGEN-DOPED CARBON; POROUS CARBON; ENERGY-STORAGE; AIR BATTERIES; ELECTROCATALYSTS; NANOSTRUCTURES; CONVERSION; STABILITY; CATALYSTS;

D O I：

10.1016/j.electacta.2017.08.091

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Metal organic frameworks (MOFs) have been considered as promising candidates for excellent electrocatalysts. Herein, we report a controllable synthesis of Co-N-C electrocatalysts derived from Zn/Co bimetallic organic frameworks (Zn/Co-MOFs). The elimination of Zn is simultaneously taken place during the pyrolysis due to its low boiling point, resulting in a very mesoporous assembly with homogeneous Co distribution in N-C framework. Zn also facilitates the dispersion of Co in the Zn/Co-MOF, which efficiently hinders the agglomeration of Co during carbonization. The results show that Co-N-C catalysts synthesized from 22.5% Co containing in the Zn/Co-MOF precursor gives the best ORR activity in alkaline solution with its half wave potential of 0.91 V vs. RHE and current density of 3.0 mA/cm(2), which is even better than those of commercial Pt/C catalysts. The high activity and current density are mainly attributed to the extremely well dispersed Co nanoparticles and the mesoporous nature. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：498 / 504

页数：7

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