Half-cell electrode assessments of a crossover-tolerant direct methanol fuel cell with a platinum group metal-free cathode
Journal Article
·
· Electrochimica Acta
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Univ. at Buffalo, NY (United States)
- Univ. of Kansas, Lawrence, KS (United States)
In this work, a platinum group metal- free (PGM-free) Fe-N-C oxygen reduction reaction (ORR) catalyst derived from metal organic framework precursors (Fe-MOF) is evaluated at the cathode side of a direct methanol fuel cell (DMFC). A wide range of methanol concentrations were used, and the performance of the DMFC using air was evaluated and compared to a commercial Pt/C cathode. We conducted our tests with a custom, integrated H2 reference electrode that separately provided the anode and cathode overpotentials. This allowed us to perform a Tafel analysis on both electrodes and understand the dominant polarizations involved at the PGM-free cathode and the PtRu/C anode. Overall, we achieved a high cell performance using a Fe-N-C based catalyst under liquid methanol and air operation with a peak power density of 111 mW/cm2, where the cathode presented a markedly larger contribution to the voltage loss versus the anode. Additionally, we used nanoscale X-ray computed tomography (nano-CT) to image the Fe-N-C cathode and investigate the ionomer and pore size distributions allowing us to identify areas of improvement for catalyst layer fabrication.
- Research Organization:
- Univ. of Kansas, Lawrence, KS (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- EE0008440
- OSTI ID:
- 1857905
- Alternate ID(s):
- OSTI ID: 2568161
- Journal Information:
- Electrochimica Acta, Journal Name: Electrochimica Acta Vol. 416; ISSN 0013-4686
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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