Trends in electrode development for next generation solid oxide fuel cells

Kan, Wang Hay; Samson, Alfred Junio; Thangadurai, Venkataraman

doi:10.1039/c6ta06757c

Cited by 157 publications

(85 citation statements)

References 127 publications

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“…The parameters of the first group lie in the materials science aspect and can be managed by the selection and optimization of electrode compositions; the parameters of the second group can be controlled through the optimization of technological methods. Analysis on the relationship between the electrochemical activity, kinetic and microstructural parameters has been thoroughly carried out . However, the influence of air humidification on the oxygen electrodes' performance was not clear, particularly for the proton‐conducting SOCs.…”

Section: Functional Materials Of Proton‐conducting Socsmentioning

confidence: 99%

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Wang

Medvedev

Shao

2018

Adv Funct Materials

103

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Fuel cells and electrolysis cells as important types of energy conversiondevices can be divided into groups based on the electrolyte material. However, solid oxide cells (SOCs) based on conventional oxygen-ion conductors are limited by several issues, such as high operating temperature, the difficulty of hydrogen purification from water, and inferior stability. To avoid these problems, proton-conducting oxides are proposed as electrolytes for SOCs in electrolysis and fuel cell modes. Since water vapor partial pressure (pH 2 O) is one of the main parameters determining the proton concentration in proton-conducting oxides (characteristics of which can be either improved or deteriorated), the pH 2 O control is extremely important for the optimization of the devices' performance and stability. This review provides an overview of the research progresses made for proton-conducting SOCs, especially for the impact of gas humidification on the operability and performance. Fundamental understanding of the main processes in proton-conducting SOCs and design principles for the key components are summarized and discussed. The trends, challenges, and future directions that exist in this dynamic field are also pointed out. This review will inspire interest from various disciplines and provide some useful guidelines for future development of proton-conductor-based energy storage and conversion systems.

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Section: Functional Materials Of Proton‐conducting Socsmentioning

confidence: 99%

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Wang

Medvedev

Shao

2018

Adv Funct Materials

103

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“…The balance of thermal expansion mismatch for all the SOFC component is necessary to avoid the degradation of the cell, which gives the negative side to cell breakdown. 38,39…”

Section: Electrodementioning

confidence: 99%

A review of solid oxide fuel cell component fabrication methods toward lowering temperature

et al. 2019

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The solid oxide fuel cells (SOFCs) emerge as an alternative power generation system for high-scale stationary application and power plant station. The SOFC consumption leads to the high-efficiency energy production that forms variety of fuels up to 60% energy conversion; the operation system does not involve the burning process and minimizes the air pollution. Also, the aptitude to provide the cogenerative energy production from the heat waste during the operation process serve SOFC as an attractive green technology and environmentally friendly. However, the SOFC consumption remains limited for transportation and portable applications because the simple design of power source compartment is still the major hurdle in each SOFC component development and commercialization. Therefore, the appropriate fabrication method of each SOFC component is important to achieve the reliability of the SOFC application for the small-scale power generation design. In this paper, an overview of the design types and SOFC components and properties following electrode, electrolyte, interconnect and sealant are discussed and summarized. As the thirdgeneration fuel cells, which entice the commercialization stage, this paper concentrates more on the fabrication method of each SOFC components that were explored including the working principle, advantage, disadvantage and several previous works on each fabrication method, which are described to finding the appropriate fabrication method toward lowering the operating temperature and develop the simple design of SOFC power sources system for the transportation and portable application. The targeted market power production of SOFC system for transportation application is about 5 kW and 250 W for portable application.

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“…Solid oxide fuel cells (SOFCs) have been gaining increasing attention in the past several decades because of their advantages of environmentally friendly power generation with good fuel flexibility and high energy conversion efficiency [1][2][3][4][5][6]. Nowadays, reducing the operating temperature of SOFCS to the intermediate-to-low temperature range (400-750 • C) is one of the most significant problems to be solved in order to promote their commercial applications [6][7][8]. Such a reduction can bring about many advantages, such as decreased material degradation, improved structural stability, ease of sealing, longer service life and much lower operational and system costs [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Zn-Doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Cathode with Enhanced ORR Catalytic Activity for SOFCs

et al. 2020

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The insufficient oxygen reduction reaction activity of cathode materials is one of the main obstacles to decreasing the operating temperature of solid oxide fuel cells (SOFCs). Here, we report a Zn-doped perovskite oxide Ba 0.5 Sr 0.5 (Co 0.8 Fe 0.2 ) 0.96 Zn 0.04 O 3-δ (BSCFZ) as the SOFC cathode, which exhibits much higher electrocatalytical activity than Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) for the oxygen reduction reaction (ORR). The BSCFZ cathode exhibited a polarization resistance of only 0.23 and 0.03 Ω·cm 2 on a symmetrical cell at 600 and 750 • C, respectively. The corresponding maximum power density of 0.58 W·cm −2 was obtained in the yittria-stabilized zirconia (YSZ)-based anode-supported single cell at 750 • C, an increase by 35% in comparison to the BSCF cathode. The enhanced performance can be attributed to a better balance of oxygen vacancies, surface electron transfer and ionic mobility as promoted by the low valence Zn 2+ doping. This work proves that Zn-doping is a highly effective strategy to further enhance the ORR electrocatalytic activity of state-of-the-art Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ cathode material for intermediate temperature SOFCs.

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Trends in electrode development for next generation solid oxide fuel cells

Cited by 157 publications

References 127 publications

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

A review of solid oxide fuel cell component fabrication methods toward lowering temperature

A Zn-Doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Cathode with Enhanced ORR Catalytic Activity for SOFCs

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