Solid Electrolyte Membranes for Low- and High-Temperature Fuel Cells

Jamil, Siti Munira; Rahman, Mazlinda Abd; Shabri, Hazrul Adzfar; Othman, Mohd Hafiz Dzarfan

doi:10.1007/978-3-030-41295-1_8

Cited by 1 publication

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“…However, gas permeability can still be observed in Cycle 5 and Cycle 6, which occur with the assistance of a large micron size finger‐like projection inside the anode (macropore). Therefore, when a Cu layer binds to the anode, the gas flow in the anode layer greatly depends on the finger‐like structure which exhibits micron size porosity 29 …”

Section: Resultsmentioning

confidence: 99%

Sol‐gel based copper metallic layer as external anode for microtubular solid oxide fuel cell

Shabri

Rudin

Othman

et al. 2022

Intl J of Energy Research

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Solid oxide fuel cell (SOFC) performance depends greatly on the anode conductivity, which in traditional nickel-yttria stabilized zirconia (Ni-YSZ) anode is determined by the Ni content that is infamous for its coking problem under hydrocarbon fuel. Without the use of high content of Ni, anode conductivity can be elevated by adding an external metal layer on top of the anode. In this study, we present the incorporation of copper (Cu) metal layer on top of the anode of micro-tubular SOFC by applying a modified sol-gel method using syringe deposition technique at various chemical compositions and deposition cycles. Cu sol was found best to be made up of 2:1:8 ratio of Cu: citric acid: ethylene glycol, with 1.36 μm metal layer formed at 5 deposition cycle, and no obvious increase in thickness after the fifth cycle. The Cu layer elevated the conductivity by 10 10 times compared to the uncoated anode. However, the coated layer also reduced the gas permeability by 10 times in the anode, which resulted from the blocking of a nano-sized pore in the anode, rather than the micron size pore. This blocking can be resolved by increasing the amount of micron-sized pore by using pore former during anode fabrication. From electrochemical impedance spectroscopy (EIS), Cu coating reduced the ohmic resistance (R ohm ) and charge transfer resistance (R ct ). From the current-voltage curve, the maximum power density (MPD) was found to increase linearly with the increase of the Cu coating cycle, but the value is almost stagnant at 2.3 to 2.5 mW cm À2 when the coating cycle of more than 4 was employed. This suggests that anode gas permeation plays an important role in anode conductivity.The findings from this study suggested that 5 deposition cycle shows to be the optimal coating layer required to achieve the percolation threshold without unnecessary loss in permeability.

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Section: Resultsmentioning

confidence: 99%