期刊
ACS ENERGY LETTERS
卷 4, 期 6, 页码 1251-1257出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00597
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资金
- National Science Foundation Materials Research Science and Engineering Center (NSF MRSEC) program [DMR-1719875]
- Dynavolt Renewable Energy Technology Co., LTD.
- National Key Research and Development Program of China [2016YFB0101203]
- National Natural Science Foundation of China [91545205, 21633008]
Hydrogen fuel cells operated in alkaline media enable the use of abundant nonprecious 3d metal oxides to replace Pt to catalyze the sluggish oxygen reduction reaction (ORR). Herein, we describe Co-Mn spinel oxide electrocatalysts with metal oxide loadings of up to 80 wt % on carbon supports. Despite little variation in ORR activity derived from rotating disk electrode (RDE) measurements, practical membrane electrode assembly (MEA) tests exhibited significant enhancement in performance when loadings increased from 40 to 80 wt %. This was ascribed to the enhanced mass transport through the thin catalyst layer at 80 wt % (<10 mu m). This work highlights the importance of incorporating MEA tests, even in early-stage catalyst development. A benchmark peak power density (PPD) of 1.2 W/cm(2) at 2.6 A/cm(2) was achieved using MnCo2O4 (80 wt %). CoMn2O4/C also achieved a PPD of 1.1 W/cm(2) under the same conditions, indicating that MEA performance of Co-Mn oxides is generally high and tolerant to compositional variations that may occur in larger-scale production.
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