WDX Studies on Ceramic Diffusion Barrier Layers of Metal Supported SOECs

Wiedenmann, Daniel; Vogt, Ulrich; Soltmann, Christian; Patz, Olaf; Schiller, Günter; Grobéty, Bernard

doi:10.1002/fuce.200800118

Cited by 5 publications

(1 citation statement)

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“…EDX analysis (EDX mapping and EDX line-scan) of a cross section of the cell proved the efficiency of the PVD diffusion barrier layer. Only very small amounts of Fe and Cr species could be detected in the hydrogen electrode and no Ni species were found in the substrate indicating that species migration has been efficiently prevented by the diffusion barrier layer [26]. In addition to the single cell tests, test runs with single repeating units (SRU) of a plasma sprayed cell and a metallic interconnect were performed.…”

Section: Resultsmentioning

confidence: 99%

High Temperature Water Electrolysis Using Metal Supported Solid Oxide Electrolyser Cells (SOEC)

Schiller

Ansar

Patz

2010

Advances in Science and Technology

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Metal supported cells as developed at DLR for use as solid oxide fuel cells by applying plasma deposition technologies were investigated in operation of high temperature steam electrolysis. The cells consisted of a porous ferritic steel support, a diffusion barrier layer, a Ni/YSZ fuel electrode, a YSZ electrolyte and a LSCF oxygen electrode. During fuel cell and electrolysis operation the cells were electrochemically characterised by means of i-V characteristics and electrochemical impedance spectroscopy measurements including a long-term test over 2000 hours. The results of electrochemical performance and long-term durability tests of both single cells and single repeating units (cell including metallic interconnect) are reported. During electrolysis operation at an operating temperature of 850 °C a cell voltage of 1.28 V was achieved at a current density of -1.0 A cm-2; at 800 °C the cell voltage was 1.40 V at the same operating conditions. The impedance spectra revealed a significantly enhanced polarisation resistance during electrolysis operation compared to fuel cell operation which was mainly attributed to the hydrogen electrode. During a long-term test run of a single cell over 2000 hours a degradation rate of 3.2% per 1000 hours was observed for operation with steam content of 43% at 800 °C and a current density of -0.3 Acm-2. Testing of a single repeating unit proved that a good contacting of cell and metallic interconnect is of major importance to achieve good performance. A test run over nearly 1000 hours showed a remarkably low degradation rate.

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Section: Resultsmentioning

confidence: 99%