Electrochemical Technologies Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

Progress in Metal-Supported Solid Oxide Fuel Cells

UNIVERSITY OF

CALIFORNIA

Power Density Progress at LBNL Symmetric-Architecture at LBNL

The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency – Energy (ARPA-E), U.S.

Department of Energy under work authorization number 13/CJ000/04/03. This work was funded in part by the U.S. Department of Energy under

contract no. DE-AC02-05CH11231.

Emir Dogdibegovic, Ruofan Wang, and Michael C. Tucker

Durability

Thermal and Redox Cycling

Current Collectors Welded on Cell

air

fuel

Fabrication

MS-SOFC Scalability

1. Tape casting and lamination of all cell layers in a single step

2. Co-sintered ceramic and stainless steel layers in reducing atmosphere (catalyst absent)

3. Catalyst introduced by infiltration (flexible catalyst compositions)

0.00 0.05 0.10 0.15 0.200.00

0.05

0.10

0.15

0.20700 C, EIS @ OCV

Cell 1

Cell 2

-Z"

(Ohm

cm

2 )

Z' (Ohmcm2)

0.00 0.05 0.10 0.15 0.20-0.02

0.00

0.02

0.04

-Z"

(Ohm

cm

2 )

Z' (Ohmcm2)

600 650 700 750 8000.0

0.4

0.8

1.2

1.6

2.0

2.4

2.8

3.2

Improved

Pea

k P

ower

(W

/cm

2 )

Temperature (°C)

Baseline

0 1 2 3

0.4

0.6

0.8

1.0

1.2

Current Density (A cm-2)

Vol

tage

(V

)

0.0

0.4

0.8

1.2

1.6

Pow

er D

ensi

ty (

W c

m-2)1.56 W/cm

2 at 700 C

POx fuel

Excellent thermal shock/gradient tolerance

Stable performance after multiple thermal cycles

Hydrogen SOFC on test rig (thermal and redox cycling)

Advantages of symmetric-architecture MS-SOFCs

1. Extreme thermal cycling

2. Redox stable

3. Mechanically robust

4. Cells do not warp

5. Flexible infiltration process:

- allows for variety of catalyst compositions based on

fuel composition

-multi-layer catalysts allow for targeted applications

6. Excellent current collection (weld on both sides)

Electrolysis

ASR (∙cm2) Baseline December

2017

March

2018

June

2018

Goal

TOTAL 0.28 0.144 0.128 0.118 0.115

Ohmic 0.09 0.037 0.037 0.037 0.037

Electrolyte 0.055 0.023 0.023 0.023 0.023

Electrode Ohmic 0.035 0.014 0.014 0.014 0.014

Electrode Polarization 0.19 0.107 0.091 0.081 0.078

Anode 0.039

Cathode 0.039

New electrolyte New catalysts Optimized cell and catalyst processing

0 25 50 75 1001.090

1.095

1.100

1.105

1.110

OC

V (

V)

Time (hours)

Cell 4

Cell 3

Cell 2

Cell 1

operated @ 0.7 V, 700 C

0 50 1000.0

0.5

1.0

1.5

2.0

minor degradation