[논문]Enhanced Electrochemical Reactivity at Electrolyte/electrode Interfaces of Solid Oxide Fuel Cells with Ag Grids

Choi, Mingi; Hwang, Sangyeon; Byun, Doyoung; Lee, Wonyoung

doi:10.4191/kcers.2015.52.5.356

[국내논문] Enhanced Electrochemical Reactivity at Electrolyte/electrode Interfaces of Solid Oxide Fuel Cells with Ag Grids 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.52 no.5, 2015년, pp.356 - 360

Choi, Mingi (Department of Mechanical Engineering, Sungkyunkwan University) , Hwang, Sangyeon (Department of Mechanical Engineering, Sungkyunkwan University) , Byun, Doyoung (Department of Mechanical Engineering, Sungkyunkwan University) , Lee, Wonyoung (Department of Mechanical Engineering, Sungkyunkwan University)

Abstract ▼ AI-Helper

The specific role of current collectors was investigated at the electrolyte/electrode interface of solid oxide fuel cells (SOFCs). Ag grids were fabricated as current collectors using electrohydrodynamic (EHD) jet printing for precise control of the grid geometry. The Ag grids reduced both the ohmic and polarization resistances as the pitch of the Ag grids decreased from $400{\mu}m$ to $100{\mu}m$. The effective electron distribution along the Ag grids improved the charge transport and transfer at the interface, extending the active reaction sites. Our results demonstrate the applicability of EHD jet printing to the fabrication of efficient current collectors for performance enhancement of SOFCs.

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문제 정의

In this study, we demonstrated the enhancing effects of Ag grids fabricated by EHD jet printing on the electrochemical performance at the electrolyte/electrode interface. To investigate the geometrical effects, the pitch of the Ag grids was varied from 100 µm to 400 µm, while the shape of each grid was maintained.

제안 방법

Secondary electron microscopy (SEM, JSM7000F, JEOL) was used to investigate the microstructure and geometry of the Ag grids and the SSC cathode layer. Electrochemical impedance spectroscopy (EIS) measurements were taken using the custom-made probe station in ambient air with an analyzing tool (GAMRY Reference 600, GAMRY INC.
Secondary electron microscopy (SEM, JSM7000F, JEOL) was used to investigate the microstructure and geometry of the Ag grids and the SSC cathode layer. Electrochemical impedance spectroscopy (EIS) measurements were taken using the custom-made probe station in ambient air with an analyzing tool (GAMRY Reference 600, GAMRY INC.) in a frequency range from 0.01 Hz to 10⁶ Hz.
We have reported the specific role of Ag grids at the elec-trolyte/electrode interface for improving the electrochemical performance of SOFCs. To systematically investigate the geometrical effects of the Ag grids, EHD jet printing was employed. With the Ag grids, both the ohmic and polariza-tion resistances decreased, and higher enhancement was observed when a smaller pitch was utilized.

대상 데이터

Figure 1 shows the schematics of the EHD jet printing process. The EHD process was performed using an EHD jet printing unit (NP-200, ENJET). For high resolution printing, the relative humidity and the temperature were maintained at 45 - 47% and 20 - 25℃, respectively.
Polyethyleneoxide (PEO, 1,300,000 MW, Sigma-Aldrich) was used to prepare the Ag inks. Water and ethanol (3:2 volume ratio) were mixed and 3 wt% of PEO was added.

성능/효과

¹¹⁾ The slope rep-resents the activation energy of oxygen ion diffusion. All samples showed almost identical activation energies, in a range of 1.07-1.09 eV, confirming that the diffusion mecha-nism remained the same and was not influenced by the Ag grids. The decrease in the ohmic resistance can be ascribed to the increase of reaction sites, which is caused by the higher electrical conductivity of the Ag grids.

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