Citation: Suzhen Ren, Yanan Guo, Shaobo Ma, Qing Mao, Dandan Wu, Ying Yang, Hongyu Jing, Xuedan Song, Ce Hao. Co₃O₄ nanoparticles assembled on polypyrrole/graphene oxide for electrochemical reduction of oxygen in alkaline media[J]. Chinese Journal of Catalysis, ;2017, 38(7): 1281-1290. doi: 10.1016/S1872-2067(17)62846-8 shu

Co₃O₄ nanoparticles assembled on polypyrrole/graphene oxide for electrochemical reduction of oxygen in alkaline media

Suzhen Ren ^a, ,
Yanan Guo ^a ,
Shaobo Ma ^a ,
Qing Mao ^b ,
Dandan Wu ^a ,
Ying Yang ^a ,
Hongyu Jing ^a ,
Xuedan Song ^a ,
Ce Hao ^a

a College of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China;
b College of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 20 October 2016
Revised Date: 30 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21373042).

The development of highly efficient catalysts for cathodes remains an important objective of fuel cell research. Here, we report Co₃O₄ nanoparticles assembled on a polypyrrole/graphene oxide electrocatalyst (Co₃O₄/Ppy/GO) as an efficient catalyst for the oxygen reduction reaction (ORR) in alkaline media. The catalyst was prepared via the hydrothermal reaction of Co²⁺ ions with Ppy-modified GO. The GO, Ppy/GO, and Co₃O₄/Ppy/GO were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The incorporation of Ppy into GO nanosheets resulted in the formation of a nitrogen-modified GO po-rous structure, which acted as an efficient electron-transport network for the ORR. With further anchoring of Co₃O₄ on Ppy/GO, the as-prepared Co₃O₄/Ppy/GO exhibited excellent ORR activity and followed a four-electron route mechanism for the ORR in alkaline solution. An onset potential of -0.10 V vs. a saturated calomel electrode and a diffusion limiting current density of 2.30 mA/cm² were achieved for the Co₃O₄/Ppy/GO catalyst heated at 800℃; these values are comparable to those for noble-metal-based Pt/C catalysts. Our work demonstrates that Co₃O₄/Ppy/GO is highly active for the ORR. Notably, the Ppy coupling effects between Co₃O₄ and GO provide a new route for the preparation of efficient non-precious electrocatalysts with hierarchical porous structures for fuel cell applications.
- Non-precious metal electrocatalyst,
- Co₃O₄,
- Polypyrrole,
- Graphene,
- Oxygen reduction reaction,
- Proton-exchange membrane fuel cell
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Co₃O₄ nanoparticles assembled on polypyrrole/graphene oxide for electrochemical reduction of oxygen in alkaline media