high-temperature gas sensors and electrode materials for ...€¦ · high-temperature gas sensors...
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www.DLR.de • Chart 1 > Electrochemical High-Temperature Gas Sensors > Bilge Saruhan-Brings •
High-Temperature Gas Sensors
and Electrode Materials for
Electrochemical Energy Storage
Bilge Saruhan-Brings
German Aerospace Center
(DLR) – Cologne Institute of Materials Research Dept. of High-Temperature and
Functional Coatings
Research and Development Topics
www.DLR.de • Chart 2 > Vortrag > Autor • Dokumetname > Datum
• Gas sensors
• High temperature NOx-Sensors
• Impedance-metric Sensing
• Resistive sensing
• Energie efficient sensors
• Electrode Materials for Energy Storage
• Nanostructured transient metal oxides
• Metal-oxide incorporated carbon nanofibrils
Development of Sensing layers
Optimization of Sensor
configuration
Sensor measurements and Modelling
Field measurement
www.DLR.de • Chart 3 > Electrochemical High-Temperature Gas Sensors > Bilge Saruhan-Brings •
Planar sensor design enables easy-integration into thermal barrier coatings (TBCs) of turbine blades
Pt- Ref. Electrode
Sensor- Electrode
PYSZ Electrolyte
Exhaust
SE-Electrodes
PYSZ-Electrolyte
Pt-
Reference
Electrode
planer gas sensor design with oxide
sensing electrode (SE)
Sensing-Electrode (2-4 µm)
Collector-Electrode (Pt)
Electrolyte EB-PVD PYSZ (500 µm)
Pt-Electrode, 2-3 µm
DLR-sensor design enables
thermo-mechanically stable,
geometrically simple sensor-
arrays
www.DLR.de • Chart 4 > Electrochemical High-Temperature Gas Sensors > Bilge Saruhan-Brings •
Response with impedance-metric sensor towards NOx
NO at 550°C
NiCr2O4/PYSZ sensor
17000
17500
18000
18500
19000
19500
20000
0 1000 2000 3000 4000 5000 6000
Time (sec)
|Z| [O
hm
]
100 ppm NO
200 ppm NO
500 ppm NO
100 ppm NO
Broken lines indicate the sensor drift
Impedance-metric gas sensors
with NiO or NiCr2O4-SE detect
total NOx selectively at
operating temperatures up to
600ºC
18500
19000
19500
20000
20500
21000
21500
22000
22500
23000
0 2000 4000 6000 8000 10000 12000 14000
Zeit [s]
|Z| [O
hm
]
NO 500 ppm
CO 100 ppm
NO 500 ppm +
CO 100 ppm
CO 400 ppm
CO - NO
NiO-PYSZ 600°C 0,1Hz
Ar
Ar
Ar
c
SR[400ppm CO] = 0,003
Time [sec]
CO+NO
Peaks at the sensor response curves are due to
on/off -switching of the MFC-valves
SE-Material Response
Time
t90 [sec]
Recovery
Time
R90 [sec]
Drift Rate
DR [min-1]
NiCr2O4 95 93 3,06∙10-4
NiO 67 74 9,74∙10-5
Sensing-Electrode (2-4 µm)
Collector-Electrode (Pt)
Electrolyte EB-PVD PYSZ (500 µm)
Pt-Electrode, 2-3 µm
Resistive type of double layer gas sensors
for NO2-sensing up to 900°C
- Catalytic convertor integrated
sensor arrays containing different
sensing electrode layers
www.DLR.de • Chart 5
100 µm
Catalyst layer
Sensor layer
Pt-electrode
Interdigitated (IDE)
Sensor configuration
High sensitivity sensing of low concentrations of H2, NO2 und SO2
at from RT to 400°C
Interdigitated (IDE)
Sensor configuration
Top-Bottom-Electrode
TBE-Sensor configuration
NO2
With the same sensor
layer: Cr:TiO2
1
3
2
Low temperature gas sensing with novel top-bottom-electrode (TBE) sensor configuration
Electrode material development
Electrodes tests
Cell-constraction
Aerospace application
System-Test
Electrode Materials for Electrochemical Energy Storage
• Plasma nanostructured and metal-oxide incorporated carbon
and graphene-layers for batteries and supercaps
• Nanostructured metal-oxide layers
> Elektroden DLR-WF-HFS – Saruhan-Brings > > März 2016
As coated H2-plasma etched
200 nm
---
200 nm
---
a b
300 nm