A comparative study on the composite cathodes with proton conductor and oxygen ion conductor for proton-conducting solid oxide fuel cell

Depletion of fossil fuel at an alarming rate is a major concern of humankind. Consequently, researchers all over the world are putting a concerted effort for finding alternative and renewable energy. Solid oxide fuel cell (SOFC) is one such system. SOFCs are electrochemical devices that have several advantages over conventional power generation systems like high efficiency of power generation, low emission of green house gases and the fuel flexibility. The major research focus of recent times is to reduce the operating temperature of SOFC in the range of 500 to 700 °C so as to render it commercially viable. This reduction in temperature is largely dependent on finding an electrolyte material with adequate oxygen ion conductivity at the intended operating temperature. One much material is Gadolinia doped Ceria (CGO) that shows very good oxygen ion conductivity at the intended operation temperature. The aim of this overview is to highlight the contribution that materials chemistry has made to the development of CGO as an electrolyte.

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Electrochemical properties of composite cathodes using Sm doped layered perovskite for intermediate temperature-operating solid oxide fuel cell

Applied Surface Science ◽

10.1016/j.apsusc.2017.02.211 ◽

2018 ◽

Vol 432 ◽

pp. 272-277 ◽

Cited By ~ 2

Author(s):

Seung-Wook Baek ◽

Abul K. Azad ◽

John T.S. Irvine ◽

Won Seok Choi ◽

Hyunil Kang ◽

...

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Electrochemical Properties ◽

Solid Oxide ◽

Intermediate Temperature ◽

Layered Perovskite ◽

Oxide Fuel ◽

Composite Cathodes ◽

Temperature Operating

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Investigation on the Performance and Durability Behavior for the Anode-Supported Solid Oxide Fuel Cell with Composite Cathodes

Materials Science Forum ◽

10.4028/www.scientific.net/msf.962.101 ◽

2019 ◽

Vol 962 ◽

pp. 101-111

Author(s):

Tai Nan Lin ◽

Yang Chuang Chang ◽

Maw Chwain Lee ◽

Wei Xin Kao

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Solid Oxide ◽

Cell Performance ◽

Constant Current ◽

External Loading ◽

Testing Time ◽

Oxide Fuel ◽

Transfer Resistance ◽

Composite Cathodes

The anode-supported solid oxide fuel cell (SOFC) comprises of NiO-8YSZ | 8YSZ | LSM-GDC | LSCF and the performance durability is executed for over 1000 hours. It shows low degradation phenomena under constant current operation during the complete testing period. The cell performance decreases with the decreasing of the temperature, and the maximum power densities are 408, 265, and 163 mW cm-2at 800, 750, and 700 °C, respectively. According to the EIS analysis with the equivalent circuit model of five serial components, all resistances decrease with the testing time except the non-charge transfer resistance of the cathode. However all resistances increase with the decreasing of the temperature on the contrary. The ohmic resistance of the cell (RO) dominates the cell performance under the whole durability test period as well as the operation temperature. In this study, the ROis determined by the interfacial contact resistances, which occurred between the cell and the connecting components. The LSM-GDC | LSCF interfaces formed the discontinuous gap due to the weak attachment and external loading. The result of the activation energy analysis shows that the rate-determination step of the cell is existed in the anode side between 700 and 800 °C. However, the cell performance is controlled from the domination of the ROat 800 °C shift to the joint contributions of the RO, anodic polarization (RAP), and cathodic polarization (RCP) at 700 °C.

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