Enhancement of electrolyte-electrode interfaces in solid oxide fuel cells

Çiğdem Timurkutluk

Article Details

Enhancement of electrolyte-electrode interfaces in solid oxide fuel cells

Authors:

Çiğdem Timurkutluk

Publisher:

Nigde Omer Halisdemir University

Main Topics:

Makine Mühendisliği

Journal:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.12 Issue 1, pp.289-296

Document Type:

Article

Publication Date:

1/2023

Document Language:

Turkish

Document ID (Org No.):

2001282511

pISSN:

2564-6605

Keywords:

Abstract:

 In this study, solid oxide fuel cell SOFC electrolyte layers produced by tape casting method are pressed together with a metal mesh under different isostatic press pressures 10-60 MPa to form surface patterns on the electrolyte. Effects of isostatic press pressure are investigated via profilometer, performance, impedance and microscopic analyses. Electrochemical measurements show that all cells with patterned electrolyte outperform the reference cell. The analyzes performed reveal that the improvement in cell performance is a result of the locally reduced electrolyte thickness as well as the increased electrolyte-electrode interface areas with surface patterning. The cell with patterned electrolyte pressed at 30 MPa pressure shows the highest peak performance of 0.373 Wcm2. For the reference cell, this value is measured as 0.320 Wcm2. At higher pressing pressures, cracks extending to the electrolyte are detected, especially in the cathode region, depending on the increased pattern depth. These cracks cause performance losses by limiting the improvement in the electrochemical reaction zones, which are expected to increase with the increase in the interfacial areas.

 In this study, solid oxide fuel cell SOFC electrolyte layers produced by tape casting method are pressed together with a metal mesh under different isostatic press pressures 10-60 MPa to form surface patterns on the electrolyte. Effects of isostatic press pressure are investigated via profilometer, performance, impedance and microscopic analyses. Electrochemical measurements show that all cells with patterned electrolyte outperform the reference cell. The analyzes performed reveal that the improvement in cell performance is a result of the locally reduced electrolyte thickness as well as the increased electrolyte-electrode interface areas with surface patterning. The cell with patterned electrolyte pressed at 30 MPa pressure shows the highest peak performance of 0.373 Wcm2. For the reference cell, this value is measured as 0.320 Wcm2. At higher pressing pressures, cracks extending to the electrolyte are detected, especially in the cathode region, depending on the increased pattern depth. These cracks cause performance losses by limiting the improvement in the electrochemical reaction zones, which are expected to increase with the increase in the interfacial areas.

 In this study, solid oxide fuel cell SOFC electrolyte layers produced by tape casting method are pressed together with a metal mesh under different isostatic press pressures 10-60 MPa to form surface patterns on the electrolyte. Effects of isostatic press pressure are investigated via profilometer, performance, impedance and microscopic analyses. Electrochemical measurements show that all cells with patterned electrolyte outperform the reference cell. The analyzes performed reveal that the improvement in cell performance is a result of the locally reduced electrolyte thickness as well as the increased electrolyte-electrode interface areas with surface patterning. The cell with patterned electrolyte pressed at 30 MPa pressure shows the highest peak performance of 0.373 Wcm2. For the reference cell, this value is measured as 0.320 Wcm2. At higher pressing pressures, cracks extending to the electrolyte are detected, especially in the cathode region, depending on the increased pattern depth. These cracks cause performance losses by limiting the improvement in the electrochemical reaction zones, which are expected to increase with the increase in the interfacial areas.

 Bu çalışmada şerit döküm yöntemi ile imal edilen katı oksit yakıt pili KOYP elektrolit tabakaları metal bir elek ile birlikte farklı izostatik pres basınçları 10-60 MPa altında preslenerek elektrolit üzerinde yüzey desenleri oluşturulmuştur. İzostatik pres basıncının etkileri; profilometre, performans, empedans ve mikroskop analizleri ile incelenmiştir. Elektrokimyasal ölçümler desenli elektrolite sahip bütün hücrelerin referans hücreden daha yüksek bir performans ortaya koyduğunu göstermiştir. Gerçekleştirilen analizler hücre performansındaki iyileşmenin desenleme ile artan elektrolit-elektrot arayüzey alanlarının yanı sıra lokal olarak azalan elektrolit kalınlığının da bir sonucu olduğunu ortaya çıkarmıştır. 0.373 Wcm2 ile en yüksek performansı ise 30 MPa basınçta preslenen desenli elektrolite sahip hücre sergilemiştir. Referans hücre için bu değer 0.320 Wcm2 olarak ölçülmüştür. Daha yüksek pres basınçlarında ise artan desen derinliğine bağlı olarak özellikle katot bölgesinde elektrolite kadar uzanan çatlaklar tespit edilmiştir. Bu çatlaklar, arayüzey alanındaki artışla artması beklenen elektrokimyasal reaksiyon bölgelerindeki iyileşmeyi sınırlayarak performans kayıplarına neden olmuştur.

Article Details

Enhancement of electrolyte-electrode interfaces in solid oxide fuel cells

Authors:

Çiğdem Timurkutluk

Publisher:

Nigde Omer Halisdemir University

Main Topics:

Makine Mühendisliği

Journal:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.12 Issue 1, pp.289-296

Document Type:

Article

Publication Date:

1/2023

Document Language:

Turkish

Document ID (Org No.):

2001282511

pISSN:

2564-6605

Solid oxide fuel cells

Electrolyte-electrode interface

Surface patterning

Katı Oksit Yakıt Pili

Elektrolit-Elektrot Arayüzey

Yüzey Desenleme.

Issues

Article Details

Enhancement of electrolyte-electrode interfaces in solid oxide fuel cells

Authors: Çiğdem Timurkutluk

Publisher: Nigde Omer Halisdemir University

Main Topics: Makine Mühendisliği

Journal: Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.12 Issue 1, pp.289-296

Document Type: Article

Publication Date: 1/2023

Document Language: Turkish

Document ID (Org No.): 2001282511

pISSN: 2564-6605

Solid oxide fuel cells

Electrolyte-electrode interface

Surface patterning

Katı Oksit Yakıt Pili

Elektrolit-Elektrot Arayüzey

Yüzey Desenleme.

Issues

Authors:

Çiğdem Timurkutluk

Publisher:

Nigde Omer Halisdemir University

Main Topics:

Makine Mühendisliği

Journal:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.12 Issue 1, pp.289-296

Document Type:

Article

Publication Date:

1/2023

Document Language:

Turkish

Document ID (Org No.):

2001282511

pISSN:

2564-6605