期刊
CHEMICAL ENGINEERING JOURNAL
卷 418, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129480
关键词
Fuel cell; Direct liquid fuel cell; pH-disparate; Oxygen transport; Triple-phase boundary
资金
- National Natural Science Foundation of China [51776156]
The ΔpH-DLFC enhances the thermodynamic voltage of DLFCs by utilizing neutralization energy, increasing the triple-phase boundary density, and achieving peak power densities of up to 610 mW cm-2. The stable operation and high power density demonstrate the potential for practical application.
The uniform pH reaction environment of both acid proton-exchange membrane and alkaline anion-exchange membrane direct liquid fuel cells (DLFCs) substantially lowers the cell performance. Herein we propose a high-performance pH-disparate DLFC (Delta pH-DLFC), which can harvest the neutralization energy to maximize the thermodynamic voltage of DLFCs. Benefiting from the construction of oxygen-electrolyte interfaces, the triplephase boundary density of cathode is significantly increased. The Delta pH-DLFCs yield peak power densities of 279, 341 and 610 mW cm-2 when methanol, ethanol and sodium formate are fed into the anode respectively. The stable operation of direct formate fuel cell at 200 mA cm-2 for 24 h further confirms the feasibility of the Delta pH-DLFCs. Moreover, the flexibility of the Delta pH-DLFC in oxidants and catalysts was also investigated. The experimental result indicates that the air-based pH-disparate direct formate fuel cell with non-platinum catalyst obtains a peak power density of 140 mW cm-2 at 80 degrees C, suggesting the great potential for practical application.
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