期刊
JOURNAL OF POWER SOURCES
卷 361, 期 -, 页码 160-169出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.06.062
关键词
Hierarchical dandelion-like NiCO2O4; Flower-like NiCo2O4; Oxygen reduction reaction; Direct methanol fuel cell
资金
- National Natural Science Foundation of China [51602246]
- Fundamental Research Funds for the Central Universities [xjj2014052]
Two NiCo2O4 bimetallic oxides were synthesized via a facile hydrothermal method. SEM and TEM observations show that these materials have three-dimensional (3D) dandelion-like (DL) and flower-like (FL) morphologies. Their large specific surface areas (90.68 and 19.8 m(2).g(-1)) and porous structures provide many active sites and effective transport pathways for the oxygen reduction reaction (ORR). Electrochemical measurements with a rotating ring-disc electrode (RRDE) indicate that the electron transfer numbers of the NiCo2O4-DL and NiCo2O4-FL catalysts for ORR in an alkaline solution are 3.97 and 3.91, respectively. Fuel cells were assembled with the bimetallic oxides, PtRu/C and a polymer fiber membrane (PFM) as cathode catalysts, anode catalyst and electrolyte film, respectively. For NiCo2O4-DL, the peak power density reaches up to 73.5 mW.cm(-2) at 26 degrees C, which is the highest room-temperature value reported to date. The high catalytic activity of NiCo2O4 is mainly attributed to the presence of many Co3+ cations that directly donate electrons to O-2 to reduce it via a more efficient and effective route. Furthermore, the catalytic performance of NiCo2O4-DL is superior to that of NiCo2O4-FL because it has a higher specific surface area and is less crystalline. (C) 2017 Elsevier B.V. All rights reserved.
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