期刊
ELECTROCHIMICA ACTA
卷 416, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140262
关键词
DMFC; Methanol; Fuel cell; PGM-free; Nano-CT; Reference electrode
资金
- Office of Energy Efficiency and Renewable Energy [DE-0008440]
- Major Research Infrastructure (MRI) award from the National Science Foundation [1229090]
- agency of the United States Government
- [MCF677785]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1229090] Funding Source: National Science Foundation
In this study, a platinum group metal-free Fe-N-C catalyst derived from metal organic framework precursors was evaluated for the cathode side of a direct methanol fuel cell. The catalyst exhibited high performance under liquid methanol and air operation, with the cathode contributing significantly to the voltage loss. Improvements in catalyst layer fabrication were identified through nanoscale X-ray computed tomography.
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/cm(2), 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.
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