Improved Internal Reference Oxygen Sensors with Composite Ceramic Electrodes

Hu, Qian; Jacobsen, Torben; Mogensen, Mogens Bjerg

doi:10.1149/2.021210jes

Cited by 6 publications

(6 citation statements)

References 56 publications

(106 reference statements)

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“…After polarization an open circuit potential of about 750 mV was obtained, which is comparable with the literature data of 760 mV [13]. The electric current levels for the structures A and B are not significantly different.…”

Section: In Situ Chemical Potential Of Reference Electrode Formationsupporting

confidence: 88%

“…For structure A the electrode is made of platinum, which is known to be a very good catalyst for oxygen reduction. In case of the B structure the electrode is made of nickel/nickel oxide, which for oxygen reduction is performing slightly worse than platinum [13]. This can also explain the lower currents during polarization for the structure B in comparison with structure A (see Fig.…”

Section: Amentioning

confidence: 98%

“…One may be aware that there is the danger of alloy formation between Ni and inner Pt electrode at relatively low temperatures (around 700 ºC), which may lead to instability in sensor response [8]. However, the experimental studies have not confirmed this as a major issue [13]. To avoid oxidation of nickel, the reference electrode was sealed from the environment and the mixture of nickel-nickel oxide was formed electrochemically from nickel oxide after sealing.…”

Section: Introductionmentioning

confidence: 99%

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Potentiometric Oxygen Sensor with Solid State Reference Electrode

Dunst¹,

Jasiński²,

Jasiński³

2014

Metrology and Measurement Systems

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The concentration or the partial pressure of oxygen in an environment can be determined using different measuring principles. For high temperature measurements of oxygen, ceramic-based sensors are the most practical. They are simple in construction, exploration and maintenance. A typical oxygen potentiometric sensor consists of an oxygen ion conducting solid electrolyte and two electrodes deposited on the two sides of the electrolyte. In this paper different structures of potentiometric oxygen sensors with a solid state reference electrode were fabricated and investigated. The fabricated structures consisted of oxygen ion conducting solid electrolyte from yttria stabilized zirconia, a sensing platinum electrode and nickel-nickel oxide reference electrode. The mixture of nickel-nickel oxide was selected as the reference electrode because it provides reliable electrochemical potential in contact with oxygen conducting electrolyte. To avoid oxidation of nickel the reference electrode is sealed from ambient and the mixture of nickel-nickel oxide was formed electrochemically from nickel oxide after sealing. The effectiveness of the sealing quality and the effectiveness of nickel-nickel oxide mixture formation was investigated by impedance spectroscopy.

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Section: In Situ Chemical Potential Of Reference Electrode Formationsupporting

confidence: 88%

Section: Amentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Potentiometric Oxygen Sensor with Solid State Reference Electrode

Dunst¹,

Jasiński²,

Jasiński³

2014

Metrology and Measurement Systems

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“…Clearly, the silver paste, in general, imposes effects on reducing the ohmic resistance instead of decreasing the polarization resistance. This is of no surprise as many typical oxides used on present solid oxide cells are comparable or even better catalysts relative to the normal metallic catalysts such as platinum and silver [7,22,36,37].…”

Section: Electrochemical Characterizationsmentioning

confidence: 81%

A high power density solid oxide fuel cell based on nano-structured La0.8Sr0.2Cr0.5Fe0.5O3-δ anode

Wei

Zhou

et al. 2014

Electrochimica Acta

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Solid oxide fuel cell (SOFC) that is capable to operate on both hydrogen and methane as fuels is desired and its anode receives particular attention since it is the cell component directly converting fuels. (La,Sr)CrFeO 3-δ is regarded as a candidate anode material but its electrochemical performance has been unsatisfactory. In this study, we improved the performance of an SOFC based exclusively on a La 0.8 Sr 0.2 Cr 0.5 Fe 0.5 O 3-δ anode by means of impregnation. At 800 °C, the maximum power densities of such a cell reach 846 mW cm-2 with hydrogen as fuel, and 117 mW cm-2 when methane is fed. The anode polarization resistances are 0.06 ohm cm 2 in hydrogen and 0.57 ohm cm 2 in methane, estimated from impedance spectra fitting results. During a stability test of 100 h in hydrogen under a current loading of 850 mA cm-2 , a conditioning period of ca. 50 h is seen during which the power density decreases moderately, and afterward the power density becomes gradually stable at around 490 mW cm-2 .

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“…Several metal/metal oxide systems have been investigated, including In/In 2 O 3 , Sn/SnO 2 , Pd/PdO, Ru/RuO 2 and Ni/NiO. [38][39][40][41][42][43][44] Many of these systems only work at 500 C or below. Among the metal/metal oxide systems studied, the Ni/NiO reference electrode is the most promising internal reference system for high temperature applications.…”

Section: Oxygen Sensorsmentioning

confidence: 99%