期刊
APPLIED ENERGY
卷 259, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2019.114154
关键词
Direct methanol fuel cells; Oxygen reduction reaction; Hetero-structured Fe2O3/Mn2O3; High efficiency
资金
- National Natural Science Foundation of China [51572158, 51972200]
- China Postdoctoral Science Foundation [2019M663607]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ2049]
- Special Fund Project of Education Department in Shaanxi Province of China [18JK0106]
- Doctoral Starting up Foundation of Shaanxi University of Science and Technology [2016BJ-75]
The development of power density and energy conversion efficiency of direct methanol fuel cells (DMFCs) is of great significance. This study presents a high-efficiency passive DMFC consisting of hetero-structured Fe2O3/Mn2O3 as the cathode catalyst, PtRu/C as the anode catalyst and polymer fiber membrane (PFM) as the electrolyte membrane. The peak power densities reached up to 60.6, 121.2 and 186.6 mW cm(-2) at 20, 50 and 70 degrees C, respectively, which was approximately 2.7 times greater than a normal cell composed of commercialized Nafion membrane and Pt/C cathode catalyst at 20 degrees C. Faradic efficiency of 85.1% and energy efficiency exceeding 42.2% were obtained. Herein, Fe2O3/Mn2O3 displays framework structure with edge lengths of 1 to 2 mu m homogeneous micro-cubes. A synergistic effect between alpha-Fe2O3 and alpha-Mn2O3 matrix in Fe2O3/Mn2O3 significantly enhances its oxygen reduction reaction (ORR) catalyzed activity. alpha-Fe2O3 with abundant oxygen vacancies could store and release O-2 through the transformation of Fe3+/Fe2+ redox couple. The three-dimensional mesoporous channel structure of Fe2O3/Mn2O3 could act as effective mass transfer reactors, in which O-2 and electrolyte is uninhibited accessed to active sites. On the other hand, numerous heterogeneous interfaces can boost electron transfer efficiency, which is investigated using the electron transfer number, narrow band gap and lower charge transfer resistance. The output performance and the energy conversion efficiency of DMFCs is considerably improved through boosting oxygen and charge transfer capability in cathode. Overall, our result provides a promising strategy to fabricate high-efficient and cost-effective fuel cells for the enhanced power conversion.
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