Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7737568 | Journal of Power Sources | 2014 | 11 Pages |
Abstract
Nd2Fe14B and Nd2Fe14B/C magnetic powders are prepared by the ball-milling and high-temperature baking methods, respectively. The effect of the magnetic powder in the oxygen transfer process is studied using the three-electrode electrochemical system, rotating disk glassy carbon electrode, and proton exchange membrane fuel cells (PEMFCs). Results show that the magnetic electrode has higher electric double-layer capacitance and lower charge-transfer resistance than the nonmagnetic electrode at different Nd2Fe14B/C load densities. In addition, the oxygen diffusion coefficient and transfer coefficient for the magnetic electrode are both larger than the nonmagnetic electrode. At 0.40 mg cmâ2 Nd2Fe14B/C load density in the PEMFC cathode, the magnetic PEMFC discharge current increases by 39.874% compared with the nonmagnetic PEMFC at 0.20 V discharge voltage. The magnetic PEMFC discharge performance at 0.80 mg cmâ2 Nd2Fe14B/C load density is lower than the magnetic PEMFC at 0.40 mg cmâ2 load density. These factors result in the decline of magnetic PEMFC discharge performance at higher Nd2Fe14B/C load density, including decreased Pt/C actual catalyst area and increased magnetic interactions among different magnetic particles.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jicheng Shi, Hongfeng Xu, Hong Zhao, Lu Lu, Xiaoxin Wu,